Re: help: raw_ip socket and system implication

[Marc Soda <marc () aspre net>]

The RST is coming from your own stack, which is not aware of the
connection your trying to build.  The easiest thing would probably to
set up a firewall rule to drop RSTs to that box.  Using, for example,
IPTables or IPChains if your on a Linux box.

On Tue, 20 Nov 2001, 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. 
>
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-- 

Marc Soda
ASPRE, Inc.
marc () aspre net
http://www.aspre.net/