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RE: NAT Configuration for Dual WAN Router

  • From: McLean Pickett
  • Date: Thu Dec 15 17:26:42 2005

Joe -

Linux can do this, check out:

More specifically: and

I am working on a redhat project that requires QoS over multiple VLAN's.
I was reading up on tc and imq devices when I came across this
information. Haven't tried this config, but it look like it should do
what you want.


-----Original Message-----
From: [] On Behalf Of
Joe Johnson
Sent: Wednesday, December 14, 2005 8:44 PM
Subject: NAT Configuration for Dual WAN Router

I've been trying over and over to figure this one out, but I'm just
hitting the end of my wits.  We have a remote office that can only get
768Kbps DSL, which they've not totally maxed out.  So management's
solution now is to buy a second DSL line, but they won't let me buy a
dual WAN router (in case they add a 3rd DSL line).
I've found some great articles on how to get the interfaces working with
2 default gateways (I used this:
s) and that is all running fine.  It alternates every few minutes which
WAN port is used when I traceroute (which is fine) and
everything is connecting fine from the router.  However, I can't figure
out how to get NAT running on the server for the 2 WAN ports for clients
inside the LAN.  I can NAT to 1 DSL, but that is useless.
What I am looking for is a tutorial in how to do this or a pointer to
someone who can help.  Anyone know of a resource for this?
Joe Johnson

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