Re: help: raw_ip socket and system implication

[Mordechai Ovits <movits () bloomberg com>]

On Tuesday 20 November 2001 11:36, qgiorgi () respublica fr wrote:
> hello,
>
> I am trying to figure out a problem i have seen with a
> tcp/ip stack of an equipement, but i need some help in
> order to finish my C code :) I read this mailing-list
> for quite a long time and i am sure there are some
> gurus here :))
>
> I successfully emulate a tcp client for the three
> handshake with raw-ip socket (with all the tcp options,
> seq num etc.. i wanted ), but when i received the
> second packet the system send also a RST back to the
> host i am trying to connect to, which is for my system
> point of view an unsollicited SYN/ACK packet.
>
> so i have
> -> SYN
> <- SYN/ACK
> -> RST ( system part )  :(
> -> ACK ( my prog )
> ...
>
> Does anybody have a mean to prevent the system to send
> this RST ?
>
> Any help will be appreciated :)
>
> Quentin.

Use some form of IP filtering.  IPchains or iptables (on Linux) can be used 
to cause the OS to ignore all packets from your target.

Worked for me,
Mordy
-- 
Mordy Ovits            Bad Password:
Network Security    nds09813-050
Bloomberg L.P.