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Re: zero window probes on linux (fwd)

To: Praveen Kumar Amritaluru <praveen@xxxxxxxxxxxx>
Subject: Re: zero window probes on linux (fwd)
From: Andi Kleen <ak@xxxxxxx>
Date: Wed, 14 Apr 2004 14:10:10 +0200
Cc: netdev@xxxxxxxxxxx
In-reply-to: <200404141205.RAA06111@xxxxxxxxxxxxxxxxxxx>
References: <20040414134106.3f36c629.ak@xxxxxxx> <200404141205.RAA06111@xxxxxxxxxxxxxxxxxxx>
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On Wed, 14 Apr 2004 17:35:33 +0530 (IST)
Praveen Kumar Amritaluru <praveen@xxxxxxxxxxxx> wrote:

> > > > >       This  seems  to be a bug.  Has it been  already  fixed in  later
> > > > >       kernel versions or is this how it is intended to remain?
> > > > 
> > > > iirc this was intentional. The RFC suggested method doesn't work when 
> > > > talking to 
> > > > some stacks.
> > > > 
> > > 
> > >   But  that  cannot  be  valid  enough   justification  for  doing
> > >   something against RFC right?
> > 
> > Of course it is. Welcome to the real world. RFC1122 has a lot of bugs and 
> > sometimes
> > does not describe really implemented practice (e.g. BSD set the defacto 
> > standard
> > in many behaviours and it does not always follow 1122) 
> 
>       So do u consider mandating definition of zero-window probes as defined
>       in RFC793 as a bug in RFC1122?

They are not directly a bug, but are just not what the world standardized on. 

 
>       Or else r u saying this bug is introduced in linux to take care of
>       faulty stacks existing in the world. zero-window probes as defined
>       in RFC1122 is not buggy right?

Implementing a production network stack is not about following some standard to 
the 
letter, but about interoperating with real implementations in a useful matter.
Linux does that.

-Andi

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