Do you think this is happening to everyone with AT&T? I was thinking about getting the vonage service, but was leary about AT&T connection problems. Maybe we should set up a test program to spew 5060/udp packets to someone and see if they get received. Maybe they have it setup for just going vonage? I did speed test with their online speed test and I was getting 814 Kbps down, 184 up. Austad, Jay wrote: >About a month ago, I signed up with Vonage.com for their Digital phone >service. It communicates over port 5060/udp using my ATT cable modem for >connectivity. It worked great up until last week, then I couldn't make or >receive calls anymore. Using a sniffer, I determined that packets from >Vonage were not making it back to my network. I contacted vonage, and they >said everything was fine on their end and it was my firewall that was >blocking it. They sent me a tcpdump which showed that returning packets >were being blocked. However, a closer look showed that the device doing the >blocking, was not the ip of my firewall, but a different device 2 hops away >from me on att's network. The device is performing NAT on *only* my >5060/udp traffic, web and other traffic work fine. It's changing the source >IP and the source port, and then it's not allowing returning UDP packets >back through, so it breaks my connection. > >Why the hell would ATT be blocking my SIP traffic? Is it because they want >me to buy their digital phone service and they are blocking competition? >Isn't it illegal to tamper with the communication of a telephone line? > >Does anyone know somebody at ATT that might be able to tell me what's going >on? Their tech support is clueless, and they just tell me to reboot my >computer and modem. This is really pissing me off. > >==================== >Jay Austad >Network Administrator >CBS MarketWatch >612.752.1132 >_______________________________________________ >Twin Cities Linux Users Group Mailing List - Minneapolis/St. Paul, Minnesota >http://www.mn-linux.org >tclug-list at mn-linux.org >https://mailman.mn-linux.org/mailman/listinfo/tclug-list > > >