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Old 09-19-2002, 01:18 PM   #1
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Registered: Sep 2002
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Problem With FTP and Maybe Port forwarding


I am trying to set up an ftp server inside my network. Is this possible??? I am trying to forward port 2000 to my internal computer at ip and I think that I am doing that right because I am not getting a log put in the drop log so I am assuming that it is getting through. But on the computer that has the ftp server there is nothing coming up in the log and the person trying to connect gets a timeout error. I type in the internal ip from a machine inside the network and this works fine. Just nothing outside can get in. Please help. I am using Mandrake 8.2 and the ftp server is on WinXP.

P.S is there and walkthrough/how-to for setting up an FTP server on the linux box...then I guess I cuold samba all the computers together and get the files anywhere on the network. This would work too but I don't know how to do it. Thanks in advance.

Old 09-19-2002, 11:16 PM   #2
Registered: Jul 2002
Location: Florida
Distribution: Centos, Slackware
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From the HOW-TO:

6.2 Destination NAT

This is done in the PREROUTING chain, just as the packet comes in; this means that anything else on the Linux box itself (routing, packet filtering) will see the packet going to its `real' destination. It also means that the `-i' (incoming interface) option can be used.

Destination NAT is specified using `-j DNAT', and the `--to-destination' option specifies an IP address, a range of IP addresses, and an optional port or range of ports (for UDP and TCP protocols only).

## Change destination addresses to
# iptables -t nat -A PREROUTING -i eth0 -j DNAT --to

## Change destination addresses to, or
# iptables -t nat -A PREROUTING -i eth0 -j DNAT --to

## Change destination addresses of web traffic to, port 8080.
# iptables -t nat -A PREROUTING -p tcp --dport 80 -i eth0 \
-j DNAT --to

Hope this is helpful,



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