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Comcast Static IP Changed With New Modem?

daemon@ATHENA.MIT.EDU (Justin Krejci)
Mon Feb 9 11:32:52 2015

X-Original-To: nanog@nanog.org
From: Justin Krejci <JKrejci@usinternet.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Mon, 9 Feb 2015 16:32:43 +0000
X-Securence-RFC2821-MAIL-FROM: jkrejci@usinternet.com
Errors-To: nanog-bounces@nanog.org

Has anyone run into the situation where their static IP address from Comcas=
t (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 st=
atic 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 repla=
ced back in December. The modem was replaced by Comcast as our previous mod=
em was apparently EOL'ed.

We're now setting up additional monitoring to verify the accessibility of o=
ur remote site via the Comcast connection so we don't have any future uh-oh=
s when we need to use our backup connection and it too is not fully functio=
nal.

TIA,
-Justin

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