VPN problems on Comcast while wireless 1

[robertjo24]

I know this seems a bit far fetched...but here is my problem.
Our area cable service provider (Houston) recently changed from Time Warner to Caomcast.
With Time Warner, I had no issues.
With Comcast...I cannot VPN to my office netowrk when I am wireless at home.
I originally had a cable modem (original issue) and a router with an access point attached.
When connected to the LAN via copper, I can VPN just fine. When connected via wireless, I authenticate, but once authenticated, I pass no traffic.
I called the service provider, they say it is my router.
I linked to my neighbor's wireless, (similar configuration) and still could not pass traffic once authenticated.
I can drive up the street and connect wirelessly at a local hotel (not Comcast service) and everything works just fine.

I even went so far as to purchase a new Buffalo wireless router. I tried every configuration I know, and it still does not work.
I called Comcast again, and they basically say there is noting they can, or will do, and basically I am screwed.I asked to speak to an engineer who can actually understand the differnce between presenting a wired or wireless intface, and they said there were "none avaialbe". I asked to speak to a manager, they said "managers do not speak to people". That was his exact words.

Has anyone experienced a similar issue with a service provider when trying to access VPN wirelessly?
If so, was there any fix?

 

[brianinms]

What sort of vpn are you connecting to? Is the wireless built into the cable modem/router or is there a cable modem and then the separate router?

 

[robertjo24]

I am using the Cisco VPN client (IPSEC over UDP) connecting to my office netowrk. Not sure what the office side is running.
The modem and wireless router are separate devices.

The system used to work prior to Comcast taking over.

Comcast recently took over the service in an adjascent neighborhood, and I will go to a freind's houst to test on his wireless connection tomorrow.

 

[brianinms]

Well if you can connect via wired in the same router, but when you connect via wireless than obviously its not an ISP issue if the router belongs to you.

 

[robertjo24]

The thing is...
It worked on Tuesday with Time Warner, it did not work on Wednesday with Comcast.
It worked on my neighbor's wireless with Time Warner, not with Comcast.
I will continue to test scenarious.

 

[brianinms]

I understand, but the wireless connection and your wired connection share the same internet connection. Hence, something has changed with your wireless router. BTW I have comcast and vpn over my wireless just fine.