Defalut kernel and ip masquerading

[ulla.russell@pp.inet.fi]

Someone on this list wrote recently wondering if 
they would need to recompile their kernel inorder 
to get ip masquerading working.

They are using a stock kernel version 2.0.38 that 
came with slink and said that when they executed the
command...

/sbin/ipfwadm -F -p deny

they got the following...

ipfwadm: setsockopt failed: Protocol not available.

I suggested first using...

echo "1" > /proc/sys/net/ipv4/ip_forward

but this did not seem to help. Does the stock kernel 
not support ip masquerading or does the problem lie elsewhere.

TIA