dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
19
share rss forum feed


NetDog
Premium,VIP
join:2002-03-04
Parker, CO
kudos:81
reply to graysonf

Re: [Business] Unexpected IPv6 address with Business Class stati

said by graysonf:

The 2001:558 address is a /128 single IPv6 address associated with a router WAN interface in the typical installation.

Correct..
said by graysonf:

Depending on what your requirements are, you may or may not be happy with Comcast native IPv6. The routed subnet is /64 and from my experience with it so far, it is quite dynamic and the assigned IP addresses are always changing.

I dont know why your PD would change all the time, I have had the same PD like my IPv4 for about 9 months now. I am going to PM you my email address please send me your data so I can take a look. Some other people have reported the same issue.


NetFixer
Bah Humbug
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
said by NetDog:

said by graysonf:

Depending on what your requirements are, you may or may not be happy with Comcast native IPv6. The routed subnet is /64 and from my experience with it so far, it is quite dynamic and the assigned IP addresses are always changing.

I dont know why your PD would change all the time, I have had the same PD like my IPv4 for about 9 months now. I am going to PM you my email address please send me your data so I can take a look. Some other people have reported the same issue.

Sounds like my Comcast/Netgear WNR1002v2-VC. Its WAN IPv6 address would randomly change, but the prefix portion of the IPv6 address (and the WAN IPv4 address) did not change. When the WAN IPv6 address changed, then the DHCP-PD LAN prefix would change (but not the local part of the IPv6 address). That is why I have retired that router to a guest router status, and replaced it with a D-Link DIR655 (which so far has not exhibited that anomaly).

I had attributed that odd behavior to it getting a /64 for its WAN IPv6 address, but if graysonf See Profile is getting a normal /128 and is also seeing changing IPv6 addresses, then there must be another cause.
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2
Reviews:
·Comcast
I am getting a /128 on WAN.

Also, when I use an online whatis my IPv6 tool, it reports my IP as the Temporary IPv6 Address that ipconfig shows:

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IPv6 Address. . . . . . . . . . . : 2601:3:1180:af:50c2:3129:f346:92ee
Temporary IPv6 Address. . . . . . : 2601:3:1180:af:1d07:33e2:85b4:a041
Link-local IPv6 Address . . . . . : fe80::50c2:3129:f346:92ee%11
IPv4 Address. . . . . . . . . . . : 192.168.1.50
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : fe80::2d0:68ff:fe00:1e74%11
192.168.1.1

I don't see a Temporary IPv6 Address in your post. Do you not get one or did you not include it?

gibwar

join:2012-12-16
Westminster, CO
I'm using DHCPv6 (stateful configuration) at this time so I can see which devices are registering IPv6. When I switch to stateless configuration the temporary address shows up and changes as expected.

As to why I didn't get one with the Comcast 2001:558 address, I'm guessing it doesn't work with the /128 prefix (which makes total sense as I type this, no room for a privacy address, duh).


NetFixer
Bah Humbug
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
reply to graysonf
said by graysonf:

I am getting a /128 on WAN.

Also, when I use an online whatis my IPv6 tool, it reports my IP as the Temporary IPv6 Address that ipconfig shows:

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IPv6 Address. . . . . . . . . . . : 2601:3:1180:af:50c2:3129:f346:92ee
Temporary IPv6 Address. . . . . . : 2601:3:1180:af:1d07:33e2:85b4:a041
Link-local IPv6 Address . . . . . : fe80::50c2:3129:f346:92ee%11
IPv4 Address. . . . . . . . . . . : 192.168.1.50
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : fe80::2d0:68ff:fe00:1e74%11
192.168.1.1

I don't see a Temporary IPv6 Address in your post. Do you not get one or did you not include it?

In my previous post, I was showing the ipconfig information for my Windows 2003 server which uses static IP assignment on its LAN interface, so no "Temporary" IPv6 address is present (also the ipconfig command in Windows Server 2003 and Windows XP does not explicitly identify the different IPv6 addresess; that has to be done using the netsh command). Shown below is the "netsh int ipv6 show addr" command for that server which does identify the different IPv6 addresses (but there is no "Temporary" address because static IP assignment is used).


C:\>netsh int ipv6 show addr
Querying active state...
 
Interface 4: Local Area Connection
 
Addr Type  DAD State  Valid Life   Pref. Life   Address
---------  ---------- ------------ ------------ -----------------------------
Public     Preferred     3d8h4m35s    3d8h4m35s 2601:5:c80:91:e291:f5ff:fe95:beac
Link       Preferred      infinite     infinite fe80::e291:f5ff:fe95:beac
 


Shown below is the ipconfig and netsh information from a Windows XP workstation (using DHCP) that does show multiple (unnamed) IPv6 addresses in the ipconfig results, and properly identified IPv6 addresses in the netsh results.


C:\>ipconfig /all
 
Windows IP Configuration
 
        Host Name . . . . . . . . . . . . : rws-wks
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Broadcast
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : dcs-net
 
Ethernet adapter Local Area Connection 2:
 
        Connection-specific DNS Suffix  . : dcs-net
        Description . . . . . . . . . . . : Realtek RTL8169/8110 Family Gigabit Ethernet NIC
        Physical Address. . . . . . . . . : E0-91-F5-95-B6-9D
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.9.100
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        IP Address. . . . . . . . . . . . : 2601:5:c80:91:44c9:6147:74a6:bef9
        IP Address. . . . . . . . . . . . : 2601:5:c80:91:e291:f5ff:fe95:b69d
        IP Address. . . . . . . . . . . . : fe80::e291:f5ff:fe95:b69d%4
        Default Gateway . . . . . . . . . : 192.168.9.254
                                            fe80::1e7e:e5ff:fe4c:e6ff%4
        DHCP Server . . . . . . . . . . . : 192.168.9.254
        DNS Servers . . . . . . . . . . . : 192.168.9.2
                                            75.75.75.75
                                            fec0:0:0:ffff::1%1
                                            fec0:0:0:ffff::2%1
                                            fec0:0:0:ffff::3%1
        Lease Obtained. . . . . . . . . . : Sunday, December 16, 2012 21:00:58
        Lease Expires . . . . . . . . . . : Sunday, December 23, 2012 21:00:58
 
C:\>netsh int ipv6 show addr
Querying active state...
 
Interface 4: Local Area Connection 2
 
Addr Type  DAD State  Valid Life   Pref. Life   Address
---------  ---------- ------------ ------------ -----------------------------
Temporary  Preferred    3d8h10m57s    23h49m25s 2601:5:c80:91:44c9:6147:74a6:bef9
Public     Preferred    3d8h10m57s   3d8h10m57s 2601:5:c80:91:e291:f5ff:fe95:b69d
Link       Preferred      infinite     infinite fe80::e291:f5ff:fe95:b69d
 



Shown below is the ipconfig information from a Windows Vista notebook using DHCP (which does identify the different IPv6 addresses).


C:\>ipconfig /all
 
Windows IP Configuration
 
   Host Name . . . . . . . . . . . . : TOSH-NB
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : dcs-net
 
Wireless LAN adapter Wireless Network Connection:
 
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Atheros AR5006EG Wireless Network Adapter
   Physical Address. . . . . . . . . : 00-1B-9E-29-90-AE
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
 
Ethernet adapter Local Area Connection:
 
   Connection-specific DNS Suffix  . : hsd1.tn.comcast.net.
   Description . . . . . . . . . . . : Realtek RTL8101 Family PCI-E Fast Ethernet NIC (NDIS 6.0)
   Physical Address. . . . . . . . . : 00-1B-38-11-79-98
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2601:5:c80:91:487c:ecd5:45a4:2620(Preferred)
   Temporary IPv6 Address. . . . . . : 2601:5:c80:91:1851:f728:5e00:ba94(Preferred)
   Link-local IPv6 Address . . . . . : fe80::487c:ecd5:45a4:2620%8(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.9.17(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Tuesday, December 11, 2012 4:36:16 PM
   Lease Expires . . . . . . . . . . : Saturday, December 22, 2012 4:36:15 AM
   Default Gateway . . . . . . . . . : fe80::1e7e:e5ff:fe4c:e6ff%8
                                       192.168.9.254
   DHCP Server . . . . . . . . . . . : 192.168.9.254
   DHCPv6 IAID . . . . . . . . . . . : 201332436
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-E4-8A-44-00-1B-38-11-79-98
   DNS Servers . . . . . . . . . . . : 2001:558:feed::1
                                       2001:558:feed::2
                                       192.168.9.2
                                       75.75.75.75
   NetBIOS over Tcpip. . . . . . . . : Enabled
   Connection-specific DNS Suffix Search List :
                                       dcs-net
 



FWIW, I use "SLAAC + Stateless DHCPv6" for the LAN in my D-Link router because I have a mixture of static IP, Windows XP, and Windows Vista boxes connecting, and using "Stateful DHCPv6" would not work for me at this time. Someday, I may fully migrate into the 21st Century, but for now just getting IPv6 implemented is more than enough of a change.

--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2
What I posted was from a Win 7 box.

The only choice in my m0n0wall router that will work with Comcast IPv6 is to configure the LAN for DHCP-PD.


NetFixer
Bah Humbug
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
said by graysonf:

What I posted was from a Win 7 box.

The only choice in my m0n0wall router that will work with Comcast IPv6 is to configure the LAN for DHCP-PD.

I also use DHCP-PD, but in my D-Link router that is a separate configuration option from "Stateful" and "Stateless".




If I select the "Stateful DHCPv6" option, my Windows XP and static IP boxes don't get native IPv6 addresses (the dual NIC server boxes do however revert to using Comcast's 6to4 tunnel).
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


NetFixer
Bah Humbug
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

1 edit
reply to gibwar
said by gibwar:

I'm using DHCPv6 (stateful configuration) at this time so I can see which devices are registering IPv6. When I switch to stateless configuration the temporary address shows up and changes as expected.

As to why I didn't get one with the Comcast 2001:558 address, I'm guessing it doesn't work with the /128 prefix (which makes total sense as I type this, no room for a privacy address, duh).

Based on the information posted previously, I am assuming that the device getting the Comcast 2001:558 address is a device connected to the SMC gateway's LAN using DHCP. Since that IP address prefix is used by Comcast for router WAN interfaces and/or standalone PC type devices that are not behind a router, it really is a strange anomaly.

When I was using my SMCD3G with a static IPv4 block, the only Comcast IPv6 implementation I could get was using Comcast's 6to4 tunnel with devices that had a public static IPv4 address and were either directly connected to the SMC gateway, or were behind my Netgear router that had a static IPv4 WAN address and was setup to be a 6to4 relay through Comcast's tunnel. Those devices however, received an IPv6 address beginning with the expected "2002" prefix.
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2
Reviews:
·Comcast
reply to NetFixer
If I needed static IPv6, I'd go back to my HE tunnel. Never had any problems with it.

For some reason my m0n0wall system log is being flooded with something to do with that DHCP-PD configuration:

rtadvd[4649]: received RA from fe80::201:5cff:fe22:c9c1 on non-advertising interface(fxp1)


graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2
Alright, I have this sorted. I disabled the generation of Temporary IPv6 Address generation.

gibwar

join:2012-12-16
Westminster, CO
reply to NetFixer
I agree completely, that's why I posted. I don't see how this could be happening, yet it is! Very, very odd indeed.

My clients are set to autoconfigure IPv6 using whatever means is the default for Windows and Mac OS X. Observing this is quite interesting because they seem to flip flop back and forth between the HE address and a Comcast address.

My servers are all configured using static IPv4 and IPv6 address with autoconfiguration and router discovery turned off.

Again, going by what I've read and what I know about IPv6 and SMC's, this shouldn't be possible... yet it is!