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Re: Comments on draft-ietf-rtgwg-rfc3682bis-05.txt

Subject: Re: Comments on draft-ietf-rtgwg-rfc3682bis-05.txt
From: Pekka Savola
Date: Sat, 28 May 2005 09:33:09 +0300 EEST
On Fri, 27 May 2005, Alia Atlas wrote:
At 03:23 PM 5/27/2005, Pekka Savola wrote:
On Wed, 25 May 2005, Alia Atlas wrote:
    The TTL field in all IP packets used for transmission of messages
    associated with GTSM-enabled protocol sessions MUST be set to 255.
This is a potentially new forwarding plane requirement. For all other
traffic, it is acceptable to decrement the TTL of packets egressing the
I don't understand what you're saying. This isn't a forwarding plane
requirement. It just says that the certain packets originated by the
router must have TTL set to specific value.
Packets originated by the control plane need to go through the forwarding
plane to exit the correct interface. That hardware may or may not decrement
the TTL, depending on architecture, config, etc.
I'm not saying that it is a large problem - but it could be pulled out a bit
more explicitly.
I'm not sure if "forwarding" is the exactly right word here, but there
is indeed a problem if the packets originated by the control plane
need to be "forwarded" by the router.
I'd prefer to just say that the TTL must not be decremented, and it's
the implementer's design choice how to deal with GTSM in a system
architecture that does that, but if these implementations are too
common, it might not be sufficient.
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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