sibnet:~# ip a 1: lo: mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:40:f4:ed:5d:4d brd ff:ff:ff:ff:ff:ff inet 192.168.105.254/24 brd 192.168.105.255 scope global eth0 inet 62.231.xx.xx/29 brd 62.231.86.207 scope global eth0:0 inet 192.168.106.254/24 brd 192.168.106.255 scope global eth0 inet6 fe80::240:f4ff:feed:5d4d/64 scope link valid_lft forever preferred_lft forever 3: eth1: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:40:f4:ed:55:70 brd ff:ff:ff:ff:ff:ff inet 193.226.xx.xx/29 brd 193.226.181.39 scope global eth1 inet6 fe80::240:f4ff:feed:5570/64 scope link valid_lft forever preferred_lft forever 4: eth2: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:0e:2e:9e:40:1c brd ff:ff:ff:ff:ff:ff inet 82.208.xx.xx/29 brd 82.208.157.127 scope global eth2 inet6 fe80::20e:2eff:fe9e:401c/64 scope link valid_lft forever preferred_lft forever 5: eth3: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:0e:2e:9e:46:4f brd ff:ff:ff:ff:ff:ff inet 82.77.xx.xx/24 brd 82.77.201.255 scope global eth3 inet6 fe80::20e:2eff:fe9e:464f/64 scope link valid_lft forever preferred_lft forever 6: eth4: mtu 1500 qdisc noop qlen 1000 link/ether 00:04:61:ad:55:f7 brd ff:ff:ff:ff:ff:ff 82.208.157.xx/29 dev eth2 proto kernel scope link src 82.208.157.xx 62.231.86.xx/29 dev eth0 proto kernel scope link src 62.231.86.xx 193.226.181.xx/29 dev eth1 proto kernel scope link src 193.226.181.xx 192.168.100.0/24 via 193.226.181.33 dev eth1 src 192.168.106.254 82.77.201.xx/24 dev eth3 proto kernel scope link src 82.77.201.xx 192.168.105.0/24 dev eth0 proto kernel scope link src 192.168.105.254 192.168.106.0/24 dev eth0 proto kernel scope link src 192.168.106.254 default via 193.226.181.xx dev eth1 sibnet:~# cat /proc/net/ip_conntrack | grep 100.188 icmp 1 29 src=192.168.100.188 dst=192.168.106.254 type=8 code=0 id=29991 packets=1031 bytes=86604 [UNREPLIED] src=192.168.106.254 dst=192.168.100.188 type=0 code=0 id=29991 packets=0 bytes=0 mark=0 secmark=0 use=1 sibnet:~# iptables -nvL Chain INPUT (policy ACCEPT 295 packets, 28964 bytes) pkts bytes target prot opt in out source destination 1216 99780 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0