hi all, I am using the "port scan match" with its default values, my rules are like this: iptables -A INPUT -m psd -j LOG --log-prefix "port scan:" // log the port scan iptables -A INPUT -m psd -j DROP // Drop it silently one of my DNS servers is 4.2.2.4 <http://4.2.2.4> , and I'm seeing these logs, which say the 4.2.2.4 <http://4.2.2.4> is port scanning my box (external interface: 192.168.100.151 <http://192.168.100.151>) !! Oct 3 17:23:35 kernel: Port scan:IN=eth0 OUT= SRC=4.2.2.4 <http://4.2.2.4>DST= 192.168.100.151 <http://192.168.100.151> LEN=8 PROTO=UDP SPT=53 DPT=32769 Oct 3 17:23:35 kernel: Port scan:IN=eth0 OUT= SRC=4.2.2.4 <http://4.2.2.4>DST= 192.168.100.151 <http://192.168.100.151> LEN=1 PROTO=UDP SPT=53 DPT=32761 Oct 3 17:23:35 kernel: Port scan:IN=eth0 OUT= SRC=4.2.2.4 <http://4.2.2.4>DST= 192.168.100.151 <http://192.168.100.151> LEN=1 PROTO=UDP SPT=53 DPT=32773 Oct 3 17:23:35 kernel: Port scan:IN=eth0 OUT= SRC=4.2.2.4 <http://4.2.2.4>DST= 192.168.100.151 <http://192.168.100.151> LEN=1 PROTO=UDP SPT=53 DPT=32775 Oct 3 17:23:35 kernel: Port scan:IN=eth0 OUT= SRC=4.2.2.4 <http://4.2.2.4>DST= 192.168.100.151 <http://192.168.100.151> LEN=1 PROTO=UDP SPT=53 DPT=32780 It seems to be a false positive, isn't it? if so, dropping them will cause problems, so what should i do? regards, afshin
