Re: [PATCH 00/19] tcp: Initial support for RFC5925 auth option
From: David Ahern
Date: Fri Sep 24 2021 - 21:35:16 EST
On 9/23/21 1:38 AM, Leonard Crestez wrote:
> On 9/22/21 11:23 PM, Francesco Ruggeri wrote:
>> On Tue, Sep 21, 2021 at 9:15 AM Leonard Crestez <cdleonard@xxxxxxxxx>
>>> * Sequence Number Extension not implemented so connections will flap
>>> every ~4G of traffic.
>> Could you expand on this?
>> What exactly do you mean by flap? Will the connection be terminated?
>> I assume that depending on the initial sequence numbers the first flaps
>> may occur well before 4G.
>> Do you use a SNE of 0 in the hash computation, or do you just not include
>> the SNE in it?
> SNE is hardcoded to zero, with the logical consequence of incorrect
> signatures on sequence number wrapping. The SNE has to be included
> because otherwise all signatures would be invalid.
> You are correct that this can break much sooner than 4G of traffic, but
> still in the GB range on average. I didn't test the exact behavior (not
> clear how) but if signatures don't validate the connection will likely
This is for BGP and LDP connections. What's the expected frequency of
rollover for large FIBs? Seems like it could be fairly often.