View Full Version : Masquerading failure for icmp packets

October 10th, 2011, 09:16 AM

I am trying to perform NAPT operation using the MASQUERADE option of iptables.

Below is my nat rules

Chain POSTROUTING (policy ACCEPT 104 packets, 6628 bytes)
pkts bytes target prot opt in out source destination
0 0 MASQUERADE tcp -- * eth1 masq ports: 63232-63359
0 0 MASQUERADE udp -- * eth1 masq ports: 63232-63359
0 0 MASQUERADE icmp -- * eth1 masq ports: 63232-63359

In case of ICMP packets the MASQUERADE option sets the echo id attribute in ICMP packet since it doesnt have any field called SOURCE PORT.

But even after using the above rules echo id in my ICMP packet is not set with the value from port range.

Can anyone help me out to debug the same ?