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Willliam Klein wrote:

> Hi all;
> 
> I'm trying to setup an ftp server inside my firewall.  I know I need to DNAT
> port 21. so my rules are:
> 
> 
>         $IPTABLES -t nat -A PREROUTING -i $EXTERNAL  -p tcp  \
>                   -d $EXT_IP --dport 21 \
>                   -j DNAT --to $REMOTEBACKUP:21
> 
>         $IPTABLES -A FORWARD  -p tcp  -s any/0 \
>                   -d $EXT_IP --dport 21 \
>                 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
> 
> Now how do I get the random unprivliged port that the client and ftp server
> agree upon to DNAT?
> 
> Thanks
> 
> willie

load the ip_conntrack_ftp and ip_nat_ftp kernel modules.

raf

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