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Re: [lwip-devel] SYN flood attack - lwip crash


From: Kieran Mansley
Subject: Re: [lwip-devel] SYN flood attack - lwip crash
Date: Fri, 30 Jan 2009 16:12:00 +0000

On Fri, 2009-01-30 at 16:36 +0100, Piero 74 wrote:

> ...now the problem is "only" how patch this bug... 
> (do you agree with me? is it a bug? i'm wrong in same way???)

I wonder if your mail box is overflowing, which might explain why
tcp_accepted never gets called.  Worth checking out.  I seem to recall
that there's a minimum size for the mailbox to ensure everything works
fine, but can't remember the details.

However, I'm not convinced you've found your bug: you had a problem
without the listen backlog code, so a bug in that code isn't going to
explain what went wrong without it.

Did you find out what's on the other pcb lists, and what the stats are
for the number of pcbs allocated?

Kieran





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