dual homed host

Robert Puyol puyol at abvent.fr
Mon May 19 17:09:49 PDT 2003

Hi :

I am still trying to set up my dual homed host. This article is a very 
good description of what I would like to achieve:

<http://www.freebsddiary.org/ip-address-change.php>  & 

Yet it is not working for me. I would like to share with you my guess : 
if my alias was a public IP then the set up could/should work, but as 
the alias is a private IP behind NAT abd a firewall, there is another 
issue, but which one ?

Robert Puyol

On Saturday, May 17, 2003, at 11:18  PM, Robert Puyol wrote:

> Hi:
> My setup is: one FreBSD server, one interface, two ISP, each providing 
> a router. So I would like to set up a dual homed host, to be able use 
> the two ISP. From some reading of the FreeBSD documentation and 
> gooooooooooogle, here are my questions:
> 0) do I need to do a sysctl net.inet.ip.forwarding=1 to get a working 
> dual homed host ?
> 1) I set an alias (private IP to use the ISP2): "ifconfig rl0 inet  
> netmask alias", the I can ping but not 
> the router at What's wrong ?
> 2) I set route: "route add -net 10.0.1/24 0", but yet I am 
> still not able to ping the router at or to ping my public IP 
> from another network.
> If I set the defaultrouter= (ISP2 router on my network) in 
> rc.conf I can use the ISP2 public IP to acces my server, but then I 
> loose the access to the primary IP of the ISP1...
> Thanks a lot for your help.
> -- 
> Robert Puyol
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