Re: [PLUG] port forwarding question

["Bradley J. Molnar" <brad@student.usyd.edu.au>]

2 ideas,

#1 - kernel 2.4.x uses ip_tables, not ip_chains (like 2.2.x did).  Since 
Ipmasq was part of ipchains, this may be the problem.  You might be able 
to find some utility that works better with ip_tables.  Someone correct 
me if i'm wrong

#2 - use SSH forwarding

look at man ssh, but, I believe that the general syntax is something like

ssh -L localport:remote machine:remote port

and can be run from either the client or the server (although I think 
that this one works best from the client -- ie, not the firewall).

There is a way to set this up to automatically start on bootup.  I know 
that someone else on the list knows a lot more about ssh than i do, so, 
I will let them answer (basically, I know that it exists but not how to 
do it).

-brad

David Calkins wrote:

> I'm running a PC with RedHat Linux 7.2 (kernel v2.4.7-10) and using 
> this machine to provide DSL internet access to my small LAN.  I've 
> installed the "Roaring Penguin" DSL client v3.3.1, which set things up 
> nicely and took care of configuring the settings necessary to have 
> masquerading work.  Currently I'm able to surf the web, check Email, 
> etc. from any machine on my LAN and its working great for this.
>
> I'd like to run a network client on one of the machines in my LAN, 
> which receives updates via UDP from a server on the internet.  So, I'd 
> like to have the linux machine forward all UDP traffic on a particular 
> port over to my LAN machine.
>
> The IP-Masquerade-HOWTO (9/12/2001), sec 6.8 provides some info on how 
> to do this.  I downloaded and installed ipmasqadm v0.4.2-4.  When I 
> try to use it, I get a setsocketopt() error, which, according to the 
> HOWTO, indicates my kernel doesn't have support for port forwarding.
>
> I attempted to rebuild the kernel with support for port forwarding, 
> however, I was unable to find any 'port forwarding' option in the 
> kernel configuration (using 'make menuconfig').
>
> Any ideas? :-)
>
>
>
>
>
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