Yes, this is very common. You are lucky to even get a working static IP when they replace a modem. A lot of times they forget to assign one or assigned one that doesn't work. No, most of the time they won't tell you the IP changed. Couple time I was told where my IP and default gateway wasn't in the same subnet. (example, static IP was x.x.x.4/30 and default gateway was x.x.x.3). Surprisingly, it didn't work. It took me 30 minutes each time to convince them that won't work. On Mon, Feb 9, 2015 at 11:32 AM, Justin Krejci <JKrejci@usinternet.com> wrote:
Has anyone run into the situation where their static IP address from Comcast (on the business class cable modem Internet service) was changed when the modem was replaced?
We have a remote site that uses Comcast as a backup Internet connection and when we went to use it recently our VPN tunnel would not establish. After working with the Comcast support group we discovered Comcast changed our static IP address. I am working through trying to figure out the when and the why with Comcast still and suspect it was changed when the modem was replaced back in December. The modem was replaced by Comcast as our previous modem was apparently EOL'ed.
We're now setting up additional monitoring to verify the accessibility of our remote site via the Comcast connection so we don't have any future uh-ohs when we need to use our backup connection and it too is not fully functional.
TIA, -Justin