Re: question about linux tcp request queue handling

From: Doug McNaught (
Date: Mon Jul 07 2003 - 17:25:17 EST

Andi Kleen <> writes:

> "Paul Albrecht" <> writes:
> > This statement is inconsistent with the description of this scenario in
> > Steven's TCP/IP Illustrated. Specifically, continuing the handshake in the
> > TCP layer, i.e., sending a syn/ack and moving to the syn_recd state, is
> > incorrect if the limit of the server's socket backlog would be exceeded.
> > How do you account for this discrepancy between linux and other
> > berkeley-derived implementations?
> The 4.4BSD-Lite code described in Stevens is long outdated. All modern
> BSDs (and probably most other Unixes too) do it in a similar way to what
> Nivedita described. The keywords are "syn flood attack" and "DoS".

And furthermore, IIRC, the current Linux networking code is not
Berkeley-derived, though an earlier version was.

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