Re: [patch] tcp connection tracking 2.4.19

From: Gianni Tedesco (
Date: Wed Oct 09 2002 - 07:30:55 EST

On Tue, 2002-10-08 at 22:06, Roberto Nibali wrote:
> Welcome to the world of almost-stateful packet filtering. Hey, other
> than that, the 3wahas 'exploit' is old. Also don't I understand why they
> claim that SYN cookies prevent syn flooding. Next time you meet someone
> of the guys, tell them about the backlog queue.

"When syncookies are enabled the packets are still answered and this
value [tcp_max_syn_backlog] is effectively ignored." -- From tcp(7)

The whole point of syncookies is to negate the need for a backlog queue.

Or did I miss your point?

// Gianni Tedesco (gianni at ecsc dot co dot uk)
lynx --source | gpg --import
8646BE7D: 6D9F 2287 870E A2C9 8F60 3A3C 91B5 7669 8646 BE7D

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to More majordomo info at Please read the FAQ at

This archive was generated by hypermail 2b29 : Tue Oct 15 2002 - 22:00:30 EST