Re: Spectrum & GRE

["Eric C. Miller via NANOG" <nanog () lists nanog org>]

Sorry, no help from here per se, but I used to get into the same situation with AT&T Uverse routers. It seemed to be an 
issue with the built-in stateful firewall of the DSL router. I was able to get around it by having tunnels to multiple 
public IPs and rotating their usage with a script on our equipment. The problem seems to self-resolve after a reboot. 
Very frustrating when you pay for static IPs.

Good luck!

Eric
________________________________
From: Brendan Carlson via NANOG <nanog () lists nanog org>
Sent: Monday, May 12, 2025 3:20 PM
To: North American Network Operators Group <nanog () lists nanog org>
Cc: Brendan Carlson <brendan () bcarlsonmedia com>
Subject: Re: Spectrum & GRE

I've seen the same thing on those same models with them being in bridge
mode specifically. They generally have issues with gre and l2tp tunnels.

On Mon, May 12, 2025 at 12:13 PM Christopher Aloi via NANOG <
nanog () lists nanog org> wrote:

> Hey All,
>
> Hoping someone can lend a hand here.   I have ~ 1k customers running GRE
> tunnels back to me for VoIP.  Over the last three weeks these tunnels have
> started to break at a rate of 3-5 per day.  We've narrowed it down to
> customers using specific Spectrum routers (rac2v1s and rac2v2s).  I am
> still able to access the public IP but the tunnel drops and will not come
> back up.  The fix has been to reconfigure as VPN or have the CPE router
> replaced with a rac2v1k.  I have been unable to get anyone to listen to me
> at Spectrum as these accounts are owned by the customer and I can't prove a
> systemic issue.  I have a list of accounts that have been impacted.  Has
> anyone else encountered this?  Any contacts at Spectrum that might listen
> to me?  I am fearing all of these tunnels will go down at some point.
>
> Thanks,
>
> Chris
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