help with iptables command

I have a linux machine, redhat 9, connected via cable modem to the
internet on eth0. Connected to eth1 is a laptop running xp. I am
attempting to use ip masquerade to allow the xp machine to connect to
the outside world via the linux machine. Here are the commands I give to
set up iptables.

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 MASQUERADE

I get the following error message after issuing the second command:
Bad argument 'MASQUERADE'

I copied this sequence of commands for a book telling one how to
interconned a windows and linux machine in a LAN. Of course, I have gone
to the iptables man pages, but cannot figure out what the error is. Can
anyone enlighten me as to what the correct command is? I am at a loss now.
Thanks for any help,
Dick Fell

richard noel fell wrote on 26.09.2003 19:48:


> I have a linux machine, redhat 9, connected via cable modem to the
> internet on eth0. Connected to eth1 is a laptop running xp. I am
> attempting to use ip masquerade to allow the xp machine to connect to
> the outside world via the linux machine. Here are the commands I give to
> set up iptables.
>
> echo 1 > /proc/sys/net/ipv4/ip_forward
> iptables -t nat -A POSTROUTING -o eth0 MASQUERADE
>
> I get the following error message after issuing the second command:
> Bad argument 'MASQUERADE'
>

Try iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
^^

Cheers

Walter

Walter -
Thanks very much.
Dick Fell

Walter Schiessberg wrote:

> richard noel fell wrote on 26.09.2003 19:48:
>
>
>> I have a linux machine, redhat 9, connected via cable modem to the
>> internet on eth0. Connected to eth1 is a laptop running xp. I am
>> attempting to use ip masquerade to allow the xp machine to connect to
>> the outside world via the linux machine. Here are the commands I give
>> to set up iptables.
>>
>> echo 1 > /proc/sys/net/ipv4/ip_forward
>> iptables -t nat -A POSTROUTING -o eth0 MASQUERADE
>>
>> I get the following error message after issuing the second command:
>> Bad argument 'MASQUERADE'
>>
>
> Try iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
> ^^
>
> Cheers
>
> Walter
>

You need to add a "-j" (for "jump") to the second line, i.e.

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

--

wcardwell at nc dot rr dot com