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[ubuntu] ssh into computer from outside my network

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http://ubuntuforums.org – Scenario: I have an old Dell desktop connected to my router. The router's a Linksys WRT54G with the Tomato firmware. The box has openssh-server installed and running on port 2222. I'm pretty sure the router's setup right, it has port 2222 being forwarded to 192.168.2.96 (the desktop), I have a Dyndns hostname being forwarded to that same internal IP, and I'm able to ssh into it from my laptop when I'm connected to this network. I also have my hosts.allow file to sshd: all: allow. However, I still can't seem to be able to access my desktop from any computer outside my network. Any ideas/links/tests to run? (HowTos)

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Submitted by dalinux on 02/15/2010 – Made popular on 02/15/2010

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If I've got a typical home router -- say a Net Gear -- which has certain ports forwarded to a internal server, is there a way to tweak the router to let me access that internal server using the external IP address from within the same network?

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sysctl net.ipv4.ip_forward=1 ldconfig iptables -t nat -A PREROUTING -p tcp -s $ATTACKER_IP --dport 22 -j DNAT --to-destination 192.168.1.200:2222 iptables -t nat -A POSTROUTING -j MASQUERADE

There is also a port forward on the router so port 2222 can be hit from outside the network.

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