--rttl function in ipt_recent doesn't work. It's supposed to match every
single packet with the same ip address and ttl value. Wierd thing is it
produces a match maybe once every 1000 packets with the same ip address and
ttl.
I get the same ip address with the same TTL value in the logs. I've also
tested this by using another computer with a stable connection (ie. same ip
address and same ttl). -m recent with --rttl doesn't match any of the
packets from that computer, but -m recent without --rttl matches.
I upgraded to ipt_recent 0.2.7 from 0.2.3 and the problem is not solved.
Can you post a fix?
I'm using vanilla kernel 2.0.43 with patches from patch-o-matic CVS
(Jan24,2003), openmosix, super-freeS/WAN, ipt_recent 0.2.7
(ipt_recent-0.2.6.tar.gz). And netfilter stuff all built as modules.
Already applied: submitted/01_2.4.19
submitted/02_2.4.20
base/iplimit
base/mport
base/nth
base/quota
base/random
base/time
base/TTL
extra/h323-conntrack-nat
extra/ipt_TARPIT
extra/mms-conntrack-nat
extra/recent
I've also removed ipt_TTL from all chains in my iptables and it had no
effect.
Here are the rules in my iptables 1.2.7a:
INPUT chain (default DROP):
-j ACCEPT -i ppp0 --state ESTABLISHED,RELATED
-j DROP -i ppp0 -m recent --update --rttl --name recentDropBox
-j LOG -i ppp0 --log-prefix recentDropBox -m limit
-j DROP -i ppp0 -m recent --set --name recentDropBox
I attempt to telnet to port 137 on this box from a computer on the internet
(ppp0) and I see in /var/log/messages:
Feb 4 12:16:11 router kernel: recentDropBoxIN=ppp0 OUT= MAC=
SRC=24.238.110.10
DST=24.239.135.221 LEN=48 TOS=0x00 PREC=0x00 TTL=122 ID=10436 DF PROTO=TCP
SPT=3
936 DPT=137 WINDOW=8760 RES=0x00 SYN URGP=0
Feb 4 12:16:14 router kernel: recentDropBoxIN=ppp0 OUT= MAC=
SRC=24.238.110.10
DST=24.239.135.221 LEN=48 TOS=0x00 PREC=0x00 TTL=122 ID=10443 DF PROTO=TCP
SPT=3
936 DPT=137 WINDOW=8760 RES=0x00 SYN URGP=0
As you can see in the log entries above it's the same source ip address and
same TTL value within 3 seconds. Obviously the DROP rule with -m recent
--update --rttl did not match which produces duplicate log entries.
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