UDP packets being filtered by TG3482G
We are having a serious problem with xfinity and theTG3482G filtering our VPN sessions.
After several days of investigation we have traced it down to keepalive packets not being delivered by the TG3482G on the xfinity network, causing the VPN to drop and reconnect. This is only with the TG3482G on the xfinity network, other models of Modems running on the xfinity network do not have this problem.
The TG3482G can be in bridge mode or router mode, there is no difference. This is also a more recent situaion probably not going back more than a month or two.
It should be noted, that this is global we have reached our to over 20 xfinity sites that have the TG3482G on xfinity and they all have the same exact problem on the VPN software. We even swaped out a problem endpoint with a motorola modem and it fixed the problem.
How do we find out if its some sort of xfinity packet filter related to this model modem?
I hope there is a way to get an answer, since it is impacting many customers.