[luau] Port Forwarding 2.4 kernel (RH 7.3)

[Mike Ballon]

[root at wwkd root]# iptables -t nat -A PREROUTING -p tcp -s x.x.x.x --dport
25 -j DNAT --to 192.168.0.5:25
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: init_module:
Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including
invalid IO or IRQ parameters
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: insmod
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o failed
/lib/modules/2.4.18-3/kernel/net/ipv4/netfilter/ip_tables.o: insmod
ip_tables failed
iptables v1.2.5: can't initialize iptables table `nat': iptables who? (do
you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

----- Original Message -----
From: "MonMotha" <monmotha at indy.rr.com>
To: <luau at videl.ics.hawaii.edu>
Sent: Sunday, September 01, 2002 10:13 PM
Subject: Re: [luau] Port Forwarding 2.4 kernel (RH 7.3)


> MonMotha wrote:
> > Unfortunately, 2.4 can't use ipmasqadm, and ipchains can't do port
> > forwards on it's own, so you'll have to use iptables for this.  Of
> > course this means converting whatever rulesets you might have (which may
> > be a problem).
> >
> > However, iptables is pretty flexible.  To forward a port:
> > iptables -t nat -A PREROUTING -p tcp -s $ExtHostIP --dport 25 --to
> > 192.168.0.5:25
> >
> > Make sure you allow it on the forward table.
> >
> > --MonMotha
>
> D'oh! Forgot the -j DNAT:
>
>
> iptables -t nat -A PREROUTING -p tcp -s $ExtHostIP --dport 25 -j DNAT
> --to 192.168.0.5:25
>
> --MonMotha
>
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