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Linux - Networking This forum is for any issue related to networks or networking.
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Old 02-10-2005, 07:40 AM   #1
alaios
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Registered: Jan 2003
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change port using destination


Hi... Do u know if it is possible to change the port of some packets using iptables.? I want the decision to be based on the ip address..
Any suggestion?
 
Old 02-10-2005, 10:39 AM   #2
fr_laz
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hi,

man iptables and search for SNAT, DNAT

ex :
iptables -t nat -A POSTROUTING -s 192.168.0.3 -p tcp --sport 80 -j SNAT --to-source 10.0.0.3:8080
iptables -t nat -A PREROUTING -d 10.0.0.3 -p tcp --dport 8080 -j DNAT --to-dest 192.168.0.3:80

You can have a look at http://www.linuxsecurity.com/resourc...-tutorial.html

Bye
 
Old 02-11-2005, 10:55 AM   #3
ugge
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I you only want to change the port, then you can use the REDIRECT target.
 
Old 03-01-2005, 05:06 AM   #4
vipspark
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Hello all of you

But as u suggested to use iptables it will redirect the traffic of ftp port to another port BUT it still outer world will use the same port.

I dont know but is there any way to change the ftp port so that default ftp port will get changed.means to ftp some system user cant enter from port 21.

thanku
KeepsmilinG
 
  


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