Is it possible to only write a log-entry when a connection is established ?
I have tried:
iptables -I OUTPUT -p tcp --dport 22 -j LOG --log-level notice --log-prefix "outgoing ssh connection"
to log outgoing SSH connections but this logs every single packet and this is as you can imagine a bit overwhelming for monitoring purposes.
I am running SLES 11 SP3.
So I would be grateful if anyone could point out a way to only write a log-entry when the conenction is established.
Best Answer
The Line you would need to log the traffic, might look possible as:
On another terminal view the logs
while :; do iptables -L OUTPUT -v -n --line-n; sleep 2; done
I am using -m state --state. However I would recommand to use
--ctstate
man iptables
for more.If you feel that you are being overwhelmed by the logs, you might consider changing the
--log-level
. http://www.netfilter.org/ can tell you more.