[plug] iptables and iFolder

Rennie rennie.barnett at gmail.com
Thu Dec 15 17:43:44 WST 2005

Hi All,

Sorry if this shows up twice. The send from gmail didn't seem to get the 

I've got iFolder up and running it seem to be very good and just the
thing I've been after for ages.

At home I have the server behind a Linksys linux based
modem/router. I have the wife's powerbook's iFolder client
pointed at our external static ip address - 210.xxx.xxx.xxx:8086. With
the modem/router set to forward all traffic coming to 
210.xxx.xxx.xxx:8086 through to my iFolder server - all seems to work 
well. The PowerBook see the server from inside the home network and also 
from the wider internet (except UWA - another story).

My problem is that I can't figure out how the get our Debian gateway
machine here at work to do the same thing - i.e. route traffic from 
within the network (192.168.xxx.xxx) who's destination is the external 
interface back to an internal machine (only for port 8086).

This is despite adding the following to the firewall script (both on 1 
line. eth0 internal NIC):

$iptables -A FORWARD -i eth0 -p tcp --dport 8086 -j ACCEPT
$iptables -t nat -A PREROUTING -i eth0 -p tcp -d 202.xxx.xxx.xxx --dport 
8086 -j DNAT --to-destination

... which are just a copies of the lines which works for the ppp0 interface.

It works fine if the iFolder traffic is coming from the internet at 
large to the external IP - i.e. is forwarded to appropriate internal
machine etc...but not if the traffic originates from any
192.168.xxx.xxx addresses.

If I can get it working the iFolder can work from laptops that are
internal or external with no changes to setting.

Does anybody know what iptable magic might fix this situation?



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