Redirect *:port to ip:port on the same machine?
Carlos Alloatti
calloatti at gmail.com
Thu May 12 09:56:21 PDT 2005
On 5/11/05, Andrew P. <infofarmer at gmail.com> wrote:
> Hello!
>
> I have a program that binds to ip:port. What are
> my options, if I want it to listen on all interfaces
> (*:port)? Let's say reconfiguring the program
> and/or running one instance per interface is
> not possible. I've got ipfw as a firewall.
>
> Thanks!
How about using a port forwarder or port mapper.
I think you could use ipfw and natd for it, with a divert rule, found this:
<quote>
> If I want to have a port mapping on the same interface, can I do that ?
> 127.0.0.1: 8890 -> 127.0.0.: 25 ?
> If I want to do so, what is natd command ?
> natd -redirect_port 127.0.0.1:8890 25?
----------------------------------------------------------------------------
----
#!/bin/sh
outip="my ip address which will be redirected"
server="ip address redirect to"
# for request redirect
ipfw add 1000 divert 8888 tcp from any to ${outip} 8890 via cx0
ipfw add 2000 divert 8888 ip from ${server} to any via cx0
#run natd
natd -p 8888 -n cx0 -redirect_port tcp ${server}:25 8890
ipfw add 2500 allow tcp from any to ${server} 25 via any
</quote>
but how about this:
http://www.taronga.com/plugdaemon/
http://www.freebsd.org/cgi/url.cgi?ports/net/jumpgate/pkg-descr
the port mapper will bind to *:port2 and forward to ip:port1
--
Carlos Alloatti
calloatti at gmail.com
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