port mapping with fake ip Post: 302389387

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Top Forums UNIX for Advanced & Expert Users port mapping with fake ip Post 302389387 by adderek on Sunday 24th of January 2010 04:44:53 PM

01-24-2010

Registered User

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"

adderek

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kf

KF(1)							    BSD General Commands Manual 						     KF(1)

NAME

     kf -- securely forward tickets

SYNOPSIS

     kf [-p port | --port=port] [-l login | --login=login] [-c ccache | --ccache=ccache] [-F | --forwardable] [-G | --no-forwardable]
	[-h | --help] [--version] host ...

DESCRIPTION

     The kf program forwards tickets to a remote host through an authenticated and encrypted stream.  Options supported are:

     -p port, --port=port
	     port to connect to

     -l login, --login=login
	     remote login name

     -c ccache, --ccache=ccache
	     remote cred cache

     -F, --forwardable
	     forward forwardable credentials

     -G, --no-forwardable
	     do not forward forwardable credentials

     -h, --help

     --version

     kf is useful when you do not want to enter your password on a remote host but want to have your tickets one for example AFS.

     In order for kf to work you will need to acquire your initial ticket with forwardable flag, i.e.  kinit --forwardable.

     telnet is able to forward tickets by itself.

SEE ALSO

     kinit(1), telnet(1), kfd(8)

Heimdal 							   July 2, 2000 							   Heimdal