01-24-2010
I am not sure what is the purpose of this question, nor if you are going to use it in a legal way.
To change a local port to be coming from another IP - this is called tunelling. It is quite simple.
If you want to make this on some local machine then you need to mangle with the TCP/IP. There are multiple ways to achieve that. I would suggest Linux + IPTables + SNAT (Source NAT) which is exactly what you need. You might use google to find how to do a SourceNAT (SNAT) on other platforms and using some specific tools.
Short description of what SNAT might be:
"If a packet is going out from my PC from port 1234 then its source IP should be replaced to IP 5.6.7.8". It would be something like (might be wrong as I am not testing that): "iptables -A MANGLE -p tcp --sport 1234 -j SNAT --from-ip 5.6.7.8"
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LEARN ABOUT SUSE
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)