On Mon, Jun 18, 2007 at 11:46:42AM +0100, first last wrote:
Hi,
I am trying to set up a firewall rule so calls to old_mailserver:25 get redirected to localhost:25. I have seen quite a few rules and none seem to work.
I have tried with the firewall enabled (configured to allow smtp) and disabled, but it doesn't seem to make a difference.
One of the commands I have been using is: /sbin/iptables -t nat -I PREROUTING -p tcp -d old_mailserver_ip/32 --dport 25 -j REDIRECT --to 127.0.0.1:25
Try this: iptables -t nat -I PREROUTING -p tcp -d old_mail_server_ip --dport 25 \ -j REDIRECT iptables -t nat -I OUTPUT -p tcp -d old_mail_server_ip --dport 25 \ -j REDIRECT
Am I missing anything?
Locally generated packets go through OUTPUT, but not PREROUTING, IIRC.