On 2008-03-20 Frédéric Massot wrote: > I have servers with public IP addresses in a DMZ behind a firewall. > > The firewall has two network interface, one connected to the DMZ, the > other to the ISP router. > > From local network, I can access the server via SSH on port 22/TCP. > > I would like to access the server from the outside on another port > like 12345/TCP. I try to translate the SSH port on the firewall with a > DNAT rule. > > I have these rules : > > iptables -A FORWARD -i $EXTERNAL_INTERFACE -o $INTERNAL_INTERFACE -p > tcp --sport $UNPRIVPORTS -d $SERVER --dport 22 -m state --state NEW -j > ACCEPT > > iptables -t nat -A PREROUTING -i $EXTERNAL_INTERFACE -p tcp -d $SERVER > --dport 12345 -j DNAT --to-destination $SERVER:22 > > With these rules I can access the server on ports 22/TCP and > 12345/TCP. > > How I can ensure that access will possible only on port 12345/TCP and > not on port 22/TCP ?
Have your sshd listen on both ports, and allow only 12345/tcp inbound on your external firewall. Regards Ansgar Wiechers -- "The Mac OS X kernel should never panic because, when it does, it seriously inconveniences the user." --http://developer.apple.com/technotes/tn2004/tn2118.html -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
