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Operating Systems Linux Red Hat iptable port forwarding between two lan interface Post 302644135 by ygemici on Monday 21st of May 2012 10:57:42 AM
Old 05-21-2012
try like this
Code:
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 22 -j DNAT --to 10.2.1.52:22
iptables -A FORWARD -p tcp -d 10.2.1.52 --dport 22 -j ACCEPT

Code:
# cat /etc/sysconfig/iptables
-N In_RULE_0
-A In_RULE_0  -j LOG  --log-level info --log-prefix "RULE 0 -- FORWARDINGSSH "
-A INPUT -p tcp -m tcp  --dport 22 -j In_RULE_0

# vi /etc/syslog.conf
kern.debug                                              /var/log/iptables
# service syslog restart
# tail -f /var/log/iptables

or trace with
Code:
# tcpdump -i eth1 port 22

 

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iptables-apply(8)					      System Manager's Manual						 iptables-apply(8)

NAME
iptables-apply - a safer way to update iptables remotely SYNOPSIS
iptables-apply [-hV] [-t timeout] ruleset-file DESCRIPTION
iptables-apply will try to apply a new ruleset (as output by iptables-save/read by iptables-restore) to iptables, then prompt the user whether the changes are okay. If the new ruleset cut the existing connection, the user will not be able to answer affirmatively. In this case, the script rolls back to the previous ruleset after the timeout expired. The timeout can be set with -t. When called as ip6tables-apply, the script will use ip6tables-save/-restore instead. OPTIONS
-t seconds, --timeout seconds Sets the timeout after which the script will roll back to the previous ruleset. -h, --help Display usage information. -V, --version Display version information. SEE ALSO
iptables-restore(8), iptables-save(8), iptables(8). LEGALESE
iptables-apply is copyright by Martin F. Krafft. This manual page was written by Martin F. Krafft <madduck@madduck.net> Permission is granted to copy, distribute and/or modify this document under the terms of the Artistic License 2.0. 2006-06-04 iptables-apply(8)
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