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Totally stucked in ssh port forwarding

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http://www.unix.com – Hello my friends , i am totally stuck in ssh port forwarding topic i had learn iptables and other networking topic without any problem but ssh port forwarding is headache 1. local port = what is this ? is this incoming traffic or outgoing traffic 2. remote port = same as above 3. dynamic port = same as above i know this topic is very easy but seriosly i am stucked in this topic I could not find any proper documentation on this topic on internet , every topic that i found is not well documentated , i mean topics are not properly written or explained . Any Help Thanks (HowTos)

jiqi2's picture
Submitted by jiqi2 on 08/20/2012

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$ sysctl net.ipv4.conf.eth0.forwarding net.ipv4.conf.eth0.forwarding = 1 $ sudo iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 2222 -j DNAT --to-destination 1.2.3.4:22

Which forwards traffic as I desired. But ssh does not work.

I have an existing iptables setup that does port forwarding. In this port forwarding scenario there are some instances where I do not want it to port forward. So, for instance I have this defined:

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Hi All,

SSH is timing out when I try to connect on my local system using my external IP/hostname. Using SSH from a remote system to the local system works, as does connecting using my local network IP.

I configured port forwarding through iptables and ufw. But there is something I do not understand, I just cant get iptables to forward port 443 to 8443 without allowing port 8443 on UFW.