NAT question (forwarding with subdomains)

["Paul F. Bernal B. - EasyTeck" <pbernal@easyteck.com>]

Hi!,

I got an internal 192.168.0.0/24 LAN with about 5 web servers including
the one which has iptables running and internet output ...

in the firewall script:
* INTERNALIF="eth1"
* INTERNALNET="192.168.0.0/24"
* INTERNALBCAST="192.168.0.255"
* EXTERNALIF="eth0"
* MYADDR="200.107.XXX.XXX"

got a rule that works fine that forwards the mail packets to the
192.168.0.2 machine:
$IPTABLES -A PREROUTING -t nat -i $EXTERNALIF -p tcp -d $MYADDR --dport 25 \
                      -j DNAT --to 192.168.0.2:25
$IPTABLES -A FORWARD -i $EXTERNALIF -p tcp -d 192.168.0.2 --dport 25 -j
ACCEPT

I have a couple subdomains pointing to MYADDR sub1.mydomain.com,
sub2.mydomain.com, etc...

What I need to do is:

When someone in the Internet asks for http://sub1.mydomain.com/ respons
the 192.168.0.3 machine (wich has a web server running port 80)

When someone in the Internet asks for http://sub2.mydomain.com/ responds
the 192.168.0.4 machine (wich has a web server running port 80)

etc., etc., etc...

I've tried something like this, but doesn't works !!!

$IPTABLES -A PREROUTING -t nat -i $EXTERNALIF -p tcp -d sub1.mydomain.com
--dport 80 \
                      -j DNAT --to 192.168.0.3:80
$IPTABLES -A FORWARD -i $EXTERNALIF -p tcp -d 192.168.0.3 --dport 80 -j
ACCEPT

Pliz give me a hand on this, thanks in advance ...

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