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05.09.2008 at 10:05AM PDT, ID: 23390143
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8.5

IPTables, DNAT, SSH forwarding - IPTables server is answering SSH calls!

Asked by jmicorp in IP Tables/IP Chains, Linux Networking, SSH / Telnet Software

Tags:

I have a rather elaborate linux cluster setup with twin controllers, twin file servers, numerous production servers, and a few other machines 'hidden' behind the cloak of lvs. Great.

I've moved some more machines behind this firewall setup. Todays task involves a Sun Solaris machine that is under a service contract w/ our software vendor. They have to be able to get to this machine via SSH and other protocols. We use SSH to communicate with the LVS director server, but need all ssh communication to a particular IP address to be forwarded on to the Solaris box.

The attached code works perfectly on all other ports -- except for SSH since my host uses it too. If i perform this exact same procedure through ldirectord and/or ipvsadm, it is able to forward the port just fine. However, since this machine is not clustered, i do not want this forward on my cluster software if only for the sake of tidyness.

Thanks for your help, 500 points!Start Free Trial
1:
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/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d 74.xx.xx.101 \
        --dport 21:22      --sport 21:22      -j DNAT --to 192.168.0.90
[+][-]05.09.2008 at 01:21PM PDT, ID: 21536160

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[+][-]05.09.2008 at 01:31PM PDT, ID: 21536223

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[+][-]05.09.2008 at 03:37PM PDT, ID: 21536818

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[+][-]05.10.2008 at 01:46PM PDT, ID: 21540433

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[+][-]05.12.2008 at 04:45AM PDT, ID: 21546009

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About this solution

Zones: IP Tables/IP Chains, Linux Networking, SSH / Telnet Software
Tags: iptables
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Solution Provided By: Kdo
Participating Experts: 1
Solution Grade: A
 
 
 
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