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Re: iptables NAT entry times out but connects from firewall

On Mon Apr 28, 2003 at 10:2742PM -0500, Hanasaki JiJi wrote:
> There is a firewall with two NICs and the below rule to allow an
> internal host to connect out to smtp servers on the internet.  Some
> hosts have a connection timeout on a connect from $INTERNAL_IP_OF_SMTP
> yet connect from the firewall just fine.
> iptables -t nat -A POSTROUTING -p tcp -o $NIC_EXTERNAL \
>        --dport 25 -s $INTERNAL_IP_OF_SMTP -j MASQUERADE
> ex:
> on firewall:
> 	telnet csoc-mail-msfc.csoconline.com 25
> 	above connects ok
> 	telnet csoc-mail-msfc.csoconline.com 25
> 	connection times out

Would be interesting to see the network traffic on the external 
interface. Without that, you can't tell much ..

Michael Bergbauer <michael@noname.franken.de>
use your idle CPU cycles - See http://www.distributed.net for details.
Visit our mud Geas at geas.franken.de Port 3333

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