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Date:	Mon, 11 Jan 2010 18:04:10 +0100
From:	Eric Dumazet <>
To:	Stephen Hemminger <>
CC:	David Miller <>,,
Subject: Re: [PATCH] tcp: Generalized TTL Security Mechanism

Le 11/01/2010 17:25, Stephen Hemminger a écrit :

> We could but:
>   1. GTSM is trying to protect against Man in the Middle attacks to existing
>      BGP connections
>   2. That is not what BSD (or other vendors) do.

Yes, unfortunately, I am afraid we are forced to be compatable.

>> Of course, for listeners waiting for connexions from different peers (and different
>> ttl values), it would be tricky.
>> Check should be done at user level, if we store ttl value of SYN packet and let
>> user application read its value by a getsockopt()
> I think IP_RECVTTL would work for that idea.

Yes, if it was extented to TCP somehow.

Given this is an IP level option, check could be done at IP level, so that other protocols
can use it too ?

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