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 :: Mailing Lists

[ILUG] Re: [Q] Max number of TCP(?) packets without waiting for an ACK(?)

[ILUG] Re: [Q] Max number of TCP(?) packets without waiting for an ACK(?)

Gavin McCullagh gmccullagh at gmail.com
Thu Dec 11 16:49:59 GMT 2008


Hi,

On Thu, 11 Dec 2008, paul at clubi.ie wrote:

> On Thu, 11 Dec 2008, Brian Foster wrote:
>
>> the admin did say it's a protection against some sort
>> of attacks (he wasn't specific and I didn't ask).
>
> Ok.. the answer is to go find this Mordac and (gently) beat them about 
> the head with a sturdy, hardback copy of Stevens, until they disable this 
> moronic and useless "security" feature.

I'd be curious to know what attack is being defended against and what it's
doing though.  Is it just dropping the connection?

> The attack Gavin mentions is interesting, but applying a rate-limiter to 
> the traffic (e.g. WRED, see Floyd, etc.) is probably a far better  
> answer, and more inline with standard, network best-practice.

I doubt Brian's issue has much to do with that attack, it just reminded me
of it a little.  Some debate has gone on over how best to deal with it.

http://www.archivum.info/tcpm@ietf.org/2007-01/msg00034.html

Gavin




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