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2.1 D-Link DVG-1120M ATA

For new accounts, especially when porting your old telephone number to TBB, please note the Length of time from signup to service activation before your TBB service is completely provisioned and activated.

    •Ensure that you can Login to the DVG ATA via the Ethernet port.

    Verify the DVG's MAC address.

    •Ensure that the DVG has the latest Firmware Version.

    •Ensure that the DVG has a valid Call Agent (CA) IP address (followed by ":2427"). Example: a.b.c.d:2427

    For security reasons, the Call Agent IP address cannot be provided here, so please search and post a request in the MyTBB Forums for example CA addresses.

    Connect the DVG ATA to a BroadBand ISP while ensuring you follow Power Up Sequencing procedures. To paraphrase, let the upstream device you are connecting the DVG to (either modem or router) be powered up and ready with an IP address, before you power-up the DVG.

    As described in the above link, you will need to Connect the DVG via the WAN port to the Internet, and may need to modify WAN Settings to achieve this.

If any of the above steps fail, you may have problems activating TBB service.

For new accounts, especially when porting your old telephone number to TBB, please note the Length of time from signup to service activation before your TBB service is completely provisioned and activated.

If all the above conditions are met, and Primus has correctly provisioned (setup) your TBB account, then your TBB service will be ready to use (green status light on the DVG ATA).

See DVG ATA telephone jacks - Which one do I use ? to determine how to connect your phone(s) to the DVG. You can also refer to How many phones can be connected to the DVG? and House Wiring for more details.

When you pick up a TBB connected phone, the DVG's phone light should turn green, you will hear dial tone, and can now make a call !


If you have any issues:

  • Please see the Troubleshooting Sections (6.0, 6.1) in this FAQ

  • Post a question in the MyTBB Portal General Features Forum with detailed info on your DVG ATA, LAN, and ISP configurations.

  • Contact Primus TBB Technical Support

  • by canoe See Profile
    last modified: 2005-09-28 10:59:49

    There are two different DVG ATA versions - see label on base:


    The V.A2 resolves some issues with a Motorola cordless phone chipset - and perhaps others.

    Contact Primus TBB Technical Support if you have the V.A1 and are having problems with phones not ringing.

    Note that you should test with only one phone at a time plugged into the DVG ATA. If there are multiple phones connected to the DVG, there may be other factors whereby the phones do not ring !

    by canoe See Profile
    last modified: 2005-07-17 23:45:39

    If your computer if connected to a LAN (router) that is upstream of the DVG ATA, you will be required to temporarily connect your computer to the DVG as described below and modify some settings as described in Accessing the DVG ATA from WAN. is the default LAN IP address of the DVG. This should not really be changed.. unless there is a specific numbering scheme for your LAN.

    If you cannot login to the IP address of the DVG - either the default IP, or one that you have set, you will have to do a HARD RESET to restore the DVG ATA to its default factory settings. The reasons for this would be that someone has changed the default IP address, or this new setting has been lost or forgotten.

    Please do not modify any DVG ATA settings unless you understand the impact on your VOIP and/or Internet service.

      •Ensure your *computer* has either:

      • A static IP address of 192.168.15.x (i.e. with the computer's gateway set to
      • DHCP enabled
        See DHCP on XP for an example on how to do this... search Google for other OSes or brands...

      NOTE: the DVG ATA has *LAN DHCP* setup by default

    1. Verify your cables and jacks.

    2. Plug your computer into the ETHERNET port on the DVG (or through a LAN that is connected to that port). Verify that your computer now has an IP address in the DVG's subnet (default: 192.168.15.x).

      If your computer was using DHCP and previously plugged into another router/modem, depending on your OS (Windows 98/XP.., Linux, etc), you might have do to a DHCP Release/Renew when you plug your computer into the DVG. This will refresh the IP address since it is now on the DVG's subnet. Restarting your computer will also get a new DHCP IP address.

    3. If needed at this point, connect the DVG to the Internet through the WAN port.

    4. Open up your favorite WEB browser.

    5. Type in the default DVG LAN address (URL):
      (or the modified LAN address that you may have set in the DVG).

    6. A DVG login screen will appear; click on the login prompt.

    7. The Userid and Password is available on a search of the TBB Portal Forums, and has been included with some of the Primus documentation originally sent with the DVG ATA. Please do not post this information on a public Forum.

    8. The first time you login to the DVG ATA, verify the DVG's MAC address.

    Please do not modify any DVG ATA settings unless you understand the impact on your VOIP and/or Internet service.

    by canoe See Profile
    last modified: 2005-07-17 23:42:12

    Primus will not allow the WAN port's MAC address to be changed, as their system will only accept certain MAC addresses for the DVG ATAs.

    If you could change the DVG's WAN port MAC address to be the same as your Computer's NIC card, it would not be recognized as a valid MAC address on the Primus TBB server, and you would never get service. Furthermore, changing the MAC address on the DVG ATA is a violation of the TBB Customer Service Agreement.

    A better solution would be to register the MAC address of the TBB DVG ATA's WAN port with your ISP so that it can receive a DHCP address... [typically the only reason for MAC address cloning]

    by canoe See Profile
    last modified: 2005-07-17 23:42:08

    Ensure that the programmed MAC address is the same as the sticker on the bottom of the DVG ATA's casing. An invalid or erroneous programmed MAC address will not permit your TBB account to be activated (no VoIP service):

      Login to the DVG ATA.

      •The programmed MAC address can be found on the second line of the Advanced Menu - Device Information screen.

    If the programmed MAC address does not match the sticker info, you should report the discrepancy to Primus TBB Technical Support.

    They will program the correct MAC address on the Primus server(s) and the DVG, but this may take a few days (3-5) before your service is activated. In some instances, Primus may determine that they need to ship you a new DVG ATA, which again can take from 3-7 days.

    NOTE: MAC address issues are related to DLINK not putting the correct sticker on the DVG-1120M base (underneath), that matches the MAC value in eprom/flash within the DVG ATA.

    by canoe See Profile
    last modified: 2005-07-17 23:43:20

    The Latest Firmware Version in the DVG ATA is 1.0M12-P. This was upgraded starting on Oct 24th, 2005.

    ** Changes have not yet been identified. **

    Your DVG should contain the latest version within at most a day of being released. The version can be determined as follows:
      Login to the DVG ATA

      •The second line on the Basic Configuration screen shows the Firmware Version.

    Refer to FirmWare Upgrade Process if your DVG Firmware Version does not match the Latest Firmware Version identified above.


    20051024 1.0M12-P [filename: 1120M-1.0M12-P-20050929.tfp]
    Identified Changes :

    This was upgraded starting on Oct 24th, 2005.


    20050926 1.0M11dP [filename: Dvg-1120M-1.0M11dP-20050729.tfp]
    Identified Changes :

    This was upgraded starting at 10am EST on the morning of Sept 26th, 2005.

    This fixes the VoiceMail Message Waiting Indicator (VMWI) won't turn off ! problem.

    NOTE: You may have do do a POWER CYCLE or NMM Reset to resolve some strange Issues as described in this Portal Thread, including not being able to FLASH/CONFERENCE.

    20050628 1.0M11aP [filename: 1120M-1.0M011aP-20050614.tfp]
    Identified Changes :

    Below is a overview of the recent firmware changes performed by Primus. Another firmware release is due within the next few weeks:

    1. Alternate DID Call Ring Tone
    2. Forum Posting: Solution to 5-minute call cut-off problem
    3. No response to every 8th VD Keep Alive (Every 8th AUEP/RSIP failing)
    4. 0005 MAC issue
    5. HTTP upload of new firmware

    MAJOR BUG INTRODUCED: VoiceMail Message Waiting Indicator (VMWI) won't turn off!

    20050405 1.0M10cP [filename: 1120M-1.0M10cP-20050302.tfp]
    - no SQUELCH when accessing VM through *98
    - no SQUELCH (a beep instead) with Visual Call Waiting
    - no SQUELCH when VWMI is activated (while on the phone)
    - VMWI indicator goes off within seconds when VM is deleted through phone
    - TFTP downloads should no longer stall

    Changes as identified by Primus:

    The latest firmware (1.0M10cP) corrects some ongoing MGCP timer issues we were having (more of a long term engineering requirements), VMWI issues, and most important TFTP download issues.

    Under certain network conditions, the previous firmware (0.010M-P) will have some issues downloading the new firmware. Thats why some users are not getting the new firmware push within three hours. Instead it can take hours, if not days. It really depends on their network conditions; a congested network will cause a TFTP download stall.

    200502?? 0.0M10-P

    by canoe See Profile
    last modified: 2005-10-24 20:46:53

    The Firmware is usually upgraded in the background (early morning 2am) through a TFTP download from the DVG ATA- upon a trigger by Primus when they deem it so (see below). Since the DVG actually initiates the TFTP download, your network configuration should not pose a problem for FirmWare upgrades; i.e. if you have a Firewall, it will not block an Upgrade.

    When Firmware is upgraded, it needs to restart the DVG which will place the DVG (and Ethernet port) OOS for 30 seconds to a minute.

    A Firmware upgrade will also Reset the DVG ATA to a default configuration. This means that any manual settings for port forwarding, ACR, or Bridge Mode will be erased.

    •If the DVG is in Bridge Mode, you will also lose Internet connectivity during this time, and your settings will be reset to defaults as noted above. You will have to restore your settings by logging into the DVG through the applicable WAN or LAN IP address.

    Note that under certain network conditions, firmware version 0.010M-P will have some issues downloading any newer firmware.

    If the DVG contains FirmWare 0.010M-P, you can attempt to trigger an automatic upgrade by simply rebooting (power cycle) the DVG. Refer to the Upgrade Process below - after the reboot, the DVG attempts to download the new FirmWare File - this is a 1.3MB file and should take about 2-4 minutes. The DVG will then reboot itself; and restore TBB service. However, if the download fails, you may have to repeat this procedure until it is successful.

    If your DVG has not upgraded to the Latest FirmWare Version within a day of the release, you should contact Primus TBB Technical Support.

    Although you can initiate a manual Firmware upgrade, it is not recommended to do so. You need to provide the correct settings to the DVG; and also understand the implications if there is a power outage or loss of Internet connection during such an upgrade. Further details to be provided shortly.

    The FirmWare Upgrade Process
    When a new FirmWare Version is to be released, Primus updates a DVG configuration file on their server(s), with the latest FirmWare Version FileName - the name of the file is in the format of MAC_DLINK1120.cfg.

    A DVG ATA always polls the Primus server every three hours for a new configuration file. When the DVG ATA gets this file and determines that the FirmWare Version (& Filename) has changed, it makes the necessary changes in its memory and begins to download (via TFTP) the new FirmWare File. [This information and interval can be verified by typing autocfg on the DVG cli - using telnet to your DVG ATA.]

    Upon completion of a successful download, it will reboot itself to run the new FirmWare Version.

    A reboot will also perform a configuration file request - which is why a Save/Restart will also initiate a FirmWare Version Upgrade.

    Manually DISABLING FirmWare Upgrades
    You can disable firmware upgrades through the "autocfg" command available through the CLI (Command Line Interface).

    Obviously, if you do not monitor the latest available F/W version in these Forums, this may cause your TBB line to sometimes not operate correctly without the latest firmware which you will have to trigger manually.

    by canoe See Profile
    last modified: 2005-07-23 20:43:10

    When using a DSL Broadband connection with PPPoE, please refer to WAN Settings for possible configuration issues.

    Connect the DVG's WAN port to the appropriate BROADBAND modem, router, or hub, depending on your LAN configuration. Keep in mind the Power Up Sequencing requirements for your LAN configuration.

    The correct WAN Settings (either PPPoE or *WAN DHCP*) should have been set by Primus when you ordered your TBB service, unless you asked to do it yourself. If the WAN settings are correct, the DVG ATA should now have access to the Internet.

    If there was an error in configuration by Primus, or you have changed BROADBAND connections or your LAN configuration (you are travelling, changed ISP...), you may need to modify the WAN Settings.

    [If the DVG ATA hangs at any point, restart your steps from the very beginning after following the necessary powerup sequence for your configuration.]

    by canoe See Profile
    last modified: 2005-07-17 23:43:05

    The default WAN setting is DHCP, so when using DHCP, simply plug it in. If the WAN settings are not as you need or has been changed from the default, please use the instructions below to set them.

    When setting PPPoE , ensure that the DVG ATA is plugged into a powered up (active) MODEM before reconfiguring the WAN settings to PPPoE and resetting the device. Otherwise upon restart, the DVG will restore the WAN settings to the default DHCP settings !

    Configuring the WAN Settings
    The DVG's WAN settings can be configured as follows:

      Login to the DVG ATA

      •Go to either "Basic Configuration" or "Config IP -> Config WAN IP Address"

      •For "Get IP From", select either PPPoE or DHCP as required.

      •For PPPoE, set the ISP required data (Username, password(s), etc)

      •For DHCP, set the Hostname if you want one - not required.

      •For a FIXED IP (i.e. in the DMZ zone), set the fixed IP address, subnet mask (, and gateway address of the router the DVG ATA is connected to.

      •Set DNS information as needed.

      •Press "Save" at bottom right.

      •On the next screen, select "Save changes and reboot system now".

      •Press "Save" in the center of the screen.

    The system should now do a restart and will take a few seconds before you can login again. Note that you should now press "shift-refresh" in your browser to access the DVG ATA.

    by canoe See Profile
    last modified: 2005-07-17 23:43:02

    You should not enable DVG ATA WAN access unless it is behind a FIREWALL (and you understand the impact on your VOIP service).

    WAN access is OFF by default, but is useful for those those configurations with a DVG ATA behind a router, where the LAN (and computers) are connected to the router instead of the DVG's Ethernet port.

    If the DVG is in the router's DMZ and has WAN access enabled, the default DVG ATA Password should be changed.

    Enabling WAN Access
    Any settings performed below will be reset to the default state after any FirmWare Upgrade.

      First, temporarily plug your computer into the ETHERNET port on the DVG ATA (or through a LAN that is connected to that port).

      Telnet to the default DVG's LAN address (URL):
      (or the modified LAN address that you may have set in the DVG).

      • Enter the following commands:
      nwdbg RAccessOn

    This provides full access to the WAN port (configuration web interface and telnet connections). The WAN IP address can be determined either by your router's LAN DHCP settings, or from the DVG's Configuration Web interface.

    Modifying WEB port
    You may also wish to modify the web port from 80 (default) to another port number. This too will be reset to the default after any FirmWare Upgrade.

    You can do this through telnet with nwdbg web port (requires a reboot) or through the default web interface:

    Login to the DVG ATA.
    • Click on Advanced.
    • Click on Device information, and change the Web port number to the port you want.

    You should not enable DVG ATA WAN access unless it is behind a FIREWALL (and you understand the impact on your VOIP service).

    by canoe See Profile
    last modified: 2005-07-20 14:45:08

    Changing the default login and password on the DVG ATA is not really necessary. WAN access is disabled by default, so unless you're concerned about someone within your LAN changing your settings, it's pretty safe to leave the password as it is.

    •The unit will not respond on the WAN port (unless you've manually changed this to Access the DVG from WAN).

    •If your DVG ATA is placed behind a router/firewall, again the situation is fairly secure as above, for access from within your extended LAN.

    However, if your DVG is configured on a router's DMZ address or connected directly to the Internet, then no firewall is present, and it is recommended to change the DVG password as specified below.

    Changing the DVG ATA's password

      Login to the DVG ATA.

      •Set the new password in the Advanced Menu - "Administration Management" screen.

    If you forget this password, you will have to perform a HARD RESET to restore the DVG ATA to recover the default states and settings (including default password).

    by canoe See Profile
    last modified: 2005-09-09 08:29:13

    Once in Bridge Mode, the DVG can only be accessed if the connected LAN (router / computer) is configured with a default gateway of and static address of 192.168.15.x (or using the relevant subnet as you may have modified the default subnet).

    Reverting to a DHCP configuration on the connected LAN will get the IP address via Bridge mode from the upstream Modem (as intended); hence no access to the DVG with this setting.

    You may also want to try an Alternate Configuration that might help some users.

    To set the DVG ATA in Bridge Mode, your ISP needs to provide two IPs (dynamic or static). This enables a router plugged into the ETHERNET port to have a distinct IP address from the DVG ATA.

    Note that DVG Bridge mode only supports IP bridging - where a downstream device on the ETHERNET port communicates with an upstream "Gateway" device (modem/router) on the WAN port. The DVG Bridge mode does not support PPPoE bridging which would necessitate ATM bridging.

      Login to the DVG ATA.

      •Set the WAN Settings to get address through DHCP (or set static if you have it).

      •Disable LAN DHCP.

      •Disable NAT.

      •In Advanced settings, find Bridge mode... Enable it.

      •Save and reset.

    A Firmware Upgrade will reset the DVG ATA to default settings.

    by canoe See Profile
    last modified: 2005-09-04 11:37:41

    The DVG-1120M ATA is also a firewall and therefore blocks all incoming traffic for externally initiated requests. As such, if you have any applications/servers on the DVG's LAN, you will have to set port forwarding on the DVG (below), or other routers connected to the WAN side of your ATA.

    Note that since this applies only to requests initiated from the Internet, if you are FTPing from your computer, there are no ports to open since the request is initiated from within your LAN. However, if you want to FTP to your computer from an external site, you need to "forward" ports as noted below.

    NOTE: See »www.firewalling.com for further details on Port Forwarding and how to configure various routers including the DVG-1120.

    DVG Port Forwarding
    Port forwarding allows traffic on a specific port to be passed on. This is handy if you need to access your LAN from a remote location or you want to set up an ftp server.

    You should setup a FIXED LAN IP for the computer(s)/server(s) you are forwarding to from the DVG. Note that this address will be determined by the DVG'S LAN IP address which by default is (i.e. Your computer/server can have an address of

    Alternatively, you can set a DHCP address range of "one" (1) to force a fixed DHCP address for the device connected to the Ethernet port.

    After signing onto the DVG, you need to go to NAT Configuration, and then Local Server Configuration to access the screens for setting up port forwarding.

    There are only 6 slots, so if you need to open up TCP and UDP simultaneously for a particular port, then you'll have even fewer left for additional ports.

    If you're a heavy BT user then good luck!

    An example by Kenmo:

    I have the following port forwarding setup working:

    cablemodem <-> DVG-1120M <-> Linux firewall/mail/webserver <-> LAN

    Inside address range (DVG):

    DVG-1120M IP address (LAN side):
    Linux box addresses: (DVG side); (LAN side)

    LAN address range:

    Ports forwarded in DVG:

    Port 22 TCP -> SSH
    Port 25 TCP -> SMTP (mail)
    Port 80 TCP -> HTTP

    For FTP you'd need to forward both 20 TCP and 21 TCP unless the ftp will be passive (PASV) mode, in which case just 21 TCP will suffice.

    These serve my needs and give me the QoS feature of the DVG.

    Now there's no reason why another router shouldn't work in place of the Linux box I'm using as a router, with those same ports forwarded to a server behind it, or maybe with that server in the router's DMZ. In any case the ports are forwarded to the address of the next machine in the chain, which may not be the final destination, comprendez (as in double NAT with multiple Gateways in sequence) ?

    Oh... for those having trouble with getting the DVG to keep the settings, always choose "Continue and 'Restart System' later" after each edit and when you are done editing, choose "Save & Restart System" from the system menu at the left and choose "Yes" when it asks if you want to save the settings. It always works for me!

    by canoe See Profile
    last modified: 2006-05-20 11:14:51

    ACR can be accessed via the Advanced settings, after logging into the DVG ATA and is used to:

      •Provide Outgoing Call Blocking using ACR when used without a POTS line connected to the DVG "LINE" port.
      •Dial certain calls through an active POTS LINE connected to the DVG "LINE" port rather than the TBB line - described below.

    ACR used with an active POTS LINE connected to the DVG "LINE" port
    All calls made through the DVG ATA are connected, by default, on the VoIP lines. ACR provides the capability for a user to specify that certain calls get routed through the (POTS) line connected to the DVG "LINE" port.

    ACR provides up to 30 "indexed" entries where you can specify the calls you would like to route through the LINE port. Each "entry" contains a Number and DelDigit field:

    Number specifies the (starting) digits of any dialling sequence that you would like ACR to "listen to" and possibly reroute to the LINE port.

    DelDigit specifies the number of digits that ACR should remove from the dialling sequence before actually dialling it on the LINE port.

    Quote from andreip (on the TBB Forum):

    Note: If using the telnet command line, the ACR (described below) can be programmed much nicer and more accurately.
    1) you can use more than 30 entries
    2) you can switch the default to pstn, so as to specify the only numbers PERMITTED in the list (BTW use "x" not "T" so as to also reject numbers too short or too long) to use voip (when leaving the PSTN jack not connected.
    3) don't forget about permitting emmergency numbers !!!
    4) the "remove digits" option is good for password-protecting LD calls

    Let's say you have a Vancouver TBB Primary number, but live in Toronto and have a Bell POTS line connected to the DVG LINE port. If you call a Toronto area code, you will probably want all these calls to go through your Bell line. You would need to create an ACR entry with only "Number" coded as 416T. This would instruct the D-Link adapter to route any calls starting with 416 to be dialled on your Bell line. You could create another entry for all "905" numbers to be handled likewise with "number" set to "905T".

    You might even want 911 going through your POTS line instead of your TBB line. In this case, you would code 911 into another ACR entry. You would not put a T after the 911 because there are no more digits to be dialled after 911.

    by Styvas See Profile edited by canoe See Profile
    last modified: 2006-01-14 00:42:57

    IF you are experiencing difficulty connecting with your DVG ATA, please contact TBB Technical support to complete the HARD RESET process and restore TBB settings.

    The DVG's default IP address is, so any computer connected through on the Ethernet port (directly or through a LAN) should be able to access this unless the default settings were changed or a new setting was lost or forgotten. This can usually be fixed with a HARD Reset, and does not require replacement of the DVG ATA, except in the case of defective H/W.


    The DLINK site provides info on how to do a HARD RESET.. which for reference is provided here:

      •Locate the reset on the back of the unit below the word RESET.

      •With the unit powered off, press and hold the Reset button with a paper clip.

      •Hold the Reset button and plug the power back in with the reset button still pressed.

      •Wait about 6 seconds then release the Reset button.

      •The unit will reboot. Allow 20-30 seconds before reconnecting.

      •The device is now at factory defaults.

    After a Hard Reset, wait for at least 4-5 minutes before proceeding. This is because the DVG will attempt to update itself with the latest Firmware (if it is connected to the Internet). This can take a few minutes, and should not be interrupted by unplugging either power or ethernet cables.

    Please note that the TBB Terms and Conditions refer specifically to resets of the DVG ATA:

    You acknowledge that performing a reset of the Equipment without permission from PRIMUS may cause Service malfunction and any damage to the Equipment caused by such malfunction will be the responsibility of the Customer. Where the Equipment is owned by PRIMUS, You will be responsible for charges for damage to the Equipment.

    by canoe See Profile
    last modified: 2005-07-18 22:31:11

    There is currently NO DMZ capability on the DVG ATA.

    by canoe See Profile
    last modified: 2005-07-17 23:45:16

    If you have 2 or more IP addresses available to you from your ISP, you may want to configure the DVG ATA in BRIDGE MODE.

    by canoe See Profile
    last modified: 2005-07-17 23:45:12

    NOTE: This applies primarily to those (few) users who are running services on their Broadband line, or are continuously maximizing their Bandwidth usage.

    All devices have limits, and you cannot get more out of the DVG-1120M, than what it was designed to do. The DVG is primarily an ATA with some basic router functions, a single LAN Ethernet port (to connect a simple home network - i.e. single computer), and is limited to forwarding six ports. If it was a *true status-quo router*, the DLINK DVG-1120M would have 3-4 LAN ports, and multi-port forwarding (ranges).

    If your LAN (home network) is connected to the DVG's Ethernet port, and you are running multiple applications (webserver, ftp server, filesharing - p2p apps - BitTorrent, Kazaa), then you may be stressing the technical limits of the DVG. See Schooner's quote below on how to resolve this.

    Anyone who really wants to get the most out of the Broadband connection should purchase a QoS capable router, such as the Linksys WRT54G. Connect the DVG to a router port and set the router's QoS to give this port priority. Connect your LAN (computers, etc) to other ports on the router. By letting the QoS router handle the bandwidth throttling, you may be able to further increase the number of connections for your p2p applications on your computer(s); as described below.

    Regardless of your LAN setup, or whether you have QoS capable devices, if you maximize bandwidth utilization of your Broadband connection, you will most likely encounter VoIP Call Quality issues.

    Quote from Schooner (on the TBB Forum):

    First, a clarification for those who may not be familiar with routers, gateways, etc. The Primus TBB gateway (also somtimes referred to as an ATA - Analogue Telephone Adaptor) is essentially a router with the added functions of a VoIP ATA.

    With that in mind, also consider that all routers have processors in them that perform calculations necessary for the functions and features of the router (ex. Routing Packets, Firewall Rules, DMZs, etc.). Because of these features and functions, the router has to do calculations for each packet that passes through it.

    Because of this, there is a limit as to the number of concurrent connections that a router can sustain. The actual number of connections is unique to that router's specific model. Some routers have better hardware than others, allowing them to sustain a high number of connections. Many "home or small office" or "Cable / DSL" routers are not nearly as powerful as large scale routers (that's why they don't cost as much, and trust me those high end routers are pricey). Generally, the old saying "You get what you pay for" seems very appropriate to this topic.

    To normal internet users, this limit isn't an important factor. They will never likely come close to the limit of connections while doing normal surfing on the web, even if they share their internet with multiple computers.

    For those of us who like to make the most of our high speed connections, this limit is very important. The reason for this is that file sharing systems work by establishing a large number of connections with other computers on the internet so that files can be shared. If not configured properly, your file sharing program could cause your router to crash over time.

    It is considered common for most home use routers to support approximately 255 concurrent connections. It is also considered good practice to configure your file sharing program to use about 66% of the connections that your router can support. So, using a setting of around 160 connections should keep you safe. Of course, you can tweak it for maximum performance if you wish.

    How do you do this? Well every file sharing program is different, so all I'm going to say is that you'll have to look for the setting on your own. Many popular file sharing clients have options for the number of connections per file, number of files that can be downloaded at a time and also the maximum number of connections (or hosts) that can be used at a time. The latter is the setting of interest to us in this situation.

    There are other settings that can impact your router as well. For example, Shareaza allows you to throttle packets. Generally, the default that Shareaza provides seems to work well. However, if you still have problems with your router and you have appropriately limited the number of connections, try adjusting the packet throttle (turn it up). This may help.

    Some of you may be asking "What does this have to do with VoIP? Well, as I mentioned above, the VoIP gateway is itself essentially a router with a built in ATA. Some people here have reported problems with their gateways crashing, QoS not working properly, etc. I feel that some of these problems may be the result of the router being hammered by file sharing clients. Therefore, adjusting the above mentioned settings will likely go a long way to improving the stability and performance of your VoIP system.

    by canoe See Profile
    last modified: 2005-10-16 12:15:27