US Cable Support > Charter Internet/TV > Charter business blocked ports

Charter business blocked ports

Not 100% sure since the first tech took it with him but seems like it was a toshiba modem and had been installed for years.

The lan is setup under a 192.XXX.XXX.XXX scheme and the wan is currently running the static IP assigned by charter.

They actually told me static was required or all ports are blocked for commerical accounts?? Naturally it was not any different than the dynamic we had used for years.

reply to tipai33
Could use more information to see what the problem is, what model modem, your router model......etc.

It is probably going to be a ACL or something along those lines.

The current modem is a SMC brand that charter provided and the routers tried were a (orginal router that allways worked before charters change over was a Linksys WRT54G), a new Linksys WRT300N and a new Netgear N600.

Even if DMZ is allowed to a local ip, all the ports are still blocked. Some of the ports we need are 8201, 8200, 12088 and 9999.

My theory (but can not get anyone high enough to check correctly) is that this is being blocked BEFORE it hits the modem but they are connecting directly to the modem so it shows nothing being blocked.

The Linksys WRT300N and Netgear N600 are the 2 main routers i install all the time for DSL or Charter on installations and never have had any issues. Something got changed when they moved us to the new modem but can't get any body that can check other than at our modem level.

You should try UPnP if the devices you want to forward support it, and then just wait and see what devices claim what port. im guessing that you have a port conflict, as charter does not block anything but the standard ports(port 25 to prevent spam, ect), and on a business account, I dont think they block any ports at all(looking into one myself for no cap and symmetrical 100 service for hosting a few minecraft servers with my computer). I have port forwarding set up for MSTSC, printer remote access, my PS3, my Wii, and my Xbox 360, and for my 2 private security cams, and I have a Netgear WNR3700, so I suspect that something is not set up properly, or you have a conflict within the router.
Just as a way to test this out(if its charter or not), connect a computer to the WAN port of the router when its all set up, assign the router a static IP, and then try and ping(after you turn "respond to ping on internet port" on in the router, and turn it off after this) some of your devices. If they dont respond, its the routers setup thats incorrect. Only takes a few minutes with a laptop to do this, and its a way to troubleshoot LAN to WAN issues. I do it myself with my own customers to test their routers to see if the modem or the router is the problem.

reply to tipai33
We have that SMC modem at our church. It can be setup up two different ways by Charter. It can be setup as a dumb modem where it just acts like a regular old modem. It can also be setup as a gateway doing routing and NAT. I am guessing that it was setup as a gateway.
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»www.teknonerd.com

reply to Chubbysumo
Yeah all ready tried those methods and everything works on my end. After going through mutiple charter techs (off site and on site) they all said the same thing, those ports are not blocked.

But as i said, everything was working correct for years until they switched our modem out. I know the techs on site can do very little as every thing is provisioned in never never land by someone else nowdays.

Charter has tried using a dynamic IP, then switched us to a static and even a static with DHCP but no changes.

On a odd note, we have a 15mb downstream plan and itused to average 10-13mb but today when i checked it clocked at 39mb! (i allways use several test from speakeasy.net to average out results)

That will get you into the admin side for the router if your handy
and port froward the router it's self.
I would think the tech that did the swap should have done that for you.User:MSO/Pass:MSOPASSWORD

reply to tipai33

Will have to get the exact model tomorrow when im in the office but it has 4 RJ45 ports on it and i was told everyone is using or getting switched out to this same model in our area.

It is setup bridge mode currently and our external IP is 68.115.xxx.xxx

The last tech brought out another modem just like this one and changed out/provisioned but same thing. He was told (by another tech via phone day before) to bring out an older version/model but when he tried to provision it they told him that one could not be provisioned as it was no longer in their system.

He also (via another tech on the phone day before) installed a basic SMC residential modem and set it up, but once again it did not allow the ports to be open.

I know it should be 68.115.xxx.xxx but what happens when
you plug your laptop into it?

I'm with dispatcher21 -- I think it's something like a
SMCD3G gateway. The issue is in the modem config
charter doesnt block those ports.

OK i am in the office now and the modem is still setup as a static from charter:
IP Address: 68.115.xxx.xxx
Mask: 255.255.255.252
DNS: 24.178.162.3, 97.81.22.195

The Modem is a SMCD3G

The current router is Netgear N600 setup at 192.168.1.1
Most of our computers/devices are setup with static IP's and a few (phones/laptops) are dynamic, reserved in the .125-.135 ranges via the router above.

All 3 routers tried were upgraded (if needed) to latest official firmware, defaulted and reset up even the brand new one currently using.

If i plug a PC directly into the modem, it will not get an IP as DHCP is turned off. At one point during the service calls they did provision the modem for DHCP with the same static IP and tried DHCP using a dynamic IP like we have always had before.

Any ideas on what to look for or how to get someone from charter that knows what to do?

Note: Im actually logged in now so same person

What is "ACL" that was posted above and is this something charter would look for?

When you say you tried the DMZ, on what device did you set up the DMZ through and where did you point it? Am I reading it correctly that you have everything connected like this:
Cable line =----= SMCD3G =----= N600 =----= Computers?

If that layout is correct, what does the Netgear N600 say its WAN IP address is?

Yes except N600 is hooked up to a 16 port switch currently (as was always). To eliminate devices during testing i had it modem --> router ---> single PC

DMZ was enabled in the router and pointed to to this single PC that was connectd to the router. This PC was then used to check if the port was open from the website yougetsignal.com but still showed closed.

The routers WAN is still showing 68.115.xxx.xxx (our assigned IP from charter)

Sorry, it is a little confusing when you reference "the router" because both the SMCD3G and the Netgear N600 are "routers". When you say "the router" are you talking about the Netgear N600 or are you talking about the SMCD3G?

Im talking about the N600 as the router used. The SMCD3G is in bridge mode according to charter.

There is one way to find out if it is really in bridge mode or not: Unplug the Netgear N600 and plug a computer set to pull DHCP directly into the SMCD3G then see if it pulls a 192.168.0.xxx IP address or not (type: ipconfig in a windows command prompt to see the computers IP address). If the SMCD3G is really in bridge mode the computer either wouldn't get an IP from DHCP at all, or at the most it would get your external 68.115.xxx.xxx IP.

If the charter techs missed it and the SMCD3G is still acting like a router, it could explain the problem.

Edit: Err, I just reread that other post where you did plug a computer directly in and it didn't get an IP, which should indicate that the SMCD3G is in bridge mode, did you try static assigning your external IP to that machine and seeing if it had internet connectivity at the time to further verify it?

Yes i can connect directly to the modem and put the static IP info in the PC and connect to the internet fine.