ipchains

["T.V.Gnanasekaran" <gnana@lanminds.com>]

I am running 2.2.12 kernel with ipforwarding compiled into the kernel.
I want to masq 192.168.1.0/24 but when I used ipchains command:

/sbin/ipchains -A forward -j MASQ -s 192.168.1.0/24

it returned: no chain by that name.
why? what is the problem?
-gnana