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Re: [Idr] TCP & BGP: Some don't send terminate BGP when holdtimer expired, because TCP recv window is 0

Enke Chen <enchen@paloaltonetworks.com> Fri, 18 December 2020 18:09 UTC

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From: Enke Chen <enchen@paloaltonetworks.com>
Date: Fri, 18 Dec 2020 10:09:17 -0800
Message-ID: <CANJ8pZ_LnDna_jtipcLJq9rrS3MM32rLdxRW8ntC2aEi9VvzMg@mail.gmail.com>
To: Jeffrey Haas <jhaas@pfrc.org>
Cc: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, "idr@ietf. org" <idr@ietf.org>
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Subject: Re: [Idr] TCP & BGP: Some don't send terminate BGP when holdtimer expired, because TCP recv window is 0
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Hi, Jeff:

No, I am not assuming that packets are getting somewhere. The
TCP_USER_TIMEOUT would work as long as there is "pending data" (either
unacked, or locally queued). The data can be from the local BGP Keepalives
or the TCP_KEEPALIVE.

Thanks.  -- Enke


On Fri, Dec 18, 2020 at 4:44 AM Jeffrey Haas <jhaas@pfrc.org> wrote:

> Enke,
>
>
> On Dec 17, 2020, at 4:02 PM, Enke Chen <enchen@paloaltonetworks.com>
> wrote:
>
> If one is paranoid that the BGP keepalive may not be generated locally,
> then use the TCP_KEEPAVLIE option together with the TCP_USER_TIMEROUT
> option. That would be more robust.
>
>
> You're making the peculiar assumption that in broken situations that
> packets are getting somewhere.  This is Brian's point.
>
> -- Jeff
>
>

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