Hello All,
I would like to ask you very kindly with /etc/sysconfig/iptables file
I have to setup port forwarding on RHEL6 router. Users from public network must be able to ssh to servers in private network behind RHEL6 router. Problem is that servers in private network must be isolated.
My boss require that there will not be any possibility of connection from private network to any remote network behind RHEL6 router
I am not able to DROP any traffic coming from private network.
I did setup port forwarding on router from public network to private network easily but I am not able to force router to drop any traffic coming from private network outside unless I break port forwarding.
here is example of my /etc/sysconfig/iptables file. Please help with line which would drop all outgoing traffic from private network but keep port forwarding working.
Code:
cat /etc/sysconfig/iptables
*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
#
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2222 -j ACCEPT
-A INPUT -p all -j DROP
#
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o eth0 -j MASQUERADE
-A PREROUTING -i eth0 -p tcp --dport 22 -j DNAT --to-destination 192.168.0.3:22
COMMIT
BTW: (ssh on router is running on port 2222)
Moderator's Comments:
Please use CODE tags as required by forum rules!
Last edited by RudiC; 04-04-2018 at 10:38 AM..
Reason: Added CODE tags.
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Hello Gurus,
I have configured port forwarding at router.
But after configuration I am not able to connect the computer from outside/Over internet/Remote desktp from other computer.
Could you please advice?
Thanks-
Pokhraj (2 Replies)
Discussion started by: pokhraj_d
2 Replies
LEARN ABOUT DEBIAN
iptables-xml
IPTABLES-XML(8)IPTABLES-XML(8)NAME
iptables-xml -- Convert iptables-save format to XML
SYNOPSIS
iptables-xml [-c] [-v]
DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro-
vided by your shell to write to a file.
-c, --combine
combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per
match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule
matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets.
-v, --verbose
Output xml comments containing the iptables line from which the XML is derived
iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in
order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between
a target like SNAT and another chain.
Some sample output is:
<iptables-rules>
<table name="mangle">
<chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573">
<rule>
<conditions>
<match>
<p>tcp</p>
</match>
<tcp>
<sport>8443</sport>
</tcp>
</conditions>
<actions>
<call>
<check_ip/>
</call>
<ACCEPT/>
</actions>
</rule>
</chain>
</table> </iptables-rules>
Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc
or similar; in this fashion:
xsltproc iptables.xslt my-iptables.xml | iptables-restore
BUGS
None known as of iptables-1.3.7 release
AUTHOR
Sam Liddicott <azez@ufomechanic.net>
SEE ALSO iptables-save(8), iptables-restore(8), iptables(8)
Jul 16, 2007 IPTABLES-XML(8)
04-04-2018
