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

[pweb . ing]

hi kieran

i forgot to tell you something about my application.

i have a task which doesn't block forever in "accept" after a creation
of listener socket: i used a "select" above 3 listener, which loop
with a timeout, and unblock when a new connection is required on a
listener; i check the select var, and call accept without block
(typical multi socket synchronization implementation in unix )

do you think it could be related with the issue and the bug we are discussing?

bye
Piero



2009/1/30, Kieran Mansley <address@hidden>:
> 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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