Hi all,
I was reading up on some iptables rules in the gentoo security handbook:
http://www.gentoo.org/doc/en/security/security-handbook.xml?part=1&chap=12&style=printable
It mentions DROPing packets with an INVALID state.
It sounded/sounds like a good idea, so I added the following rule:
-A INPUT -i eth0 -m state --state INVALID -j LOG
As suggested, I addd this rule just ABOVE this one:
-A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
I also changed the DROP action to LOG so I could see what it did if
anything.
Right after adding this rule, I started seeing lines like this in the log:
Dec 16 10:15:31 myhost kernel: IN=eth0 OUT=
MAC=00:e0:81:54:9c:8a:00:90:7f:86:a8:c0:08:00 SRC=208.87.137.233
DST=192.168.1.252 LEN=40 TOS=0x00 PREC=0x00 TTL=52 ID=0 DF PROTO=TCP
SPT=50113 DPT=25 WINDOW=0 RES=0x00 RST URGP=0
What I don't understand is why it isn't using my LOG prefix that is used
for everything else:
-A INPUT -j LOG --log-prefix "(>fw-drop): " --log-level 7
Anyone?
