Use different ip ranges on 1 network to create different IP domains. Use policy
routing on another router to resolve to different networks (interfaces) based
on source address. thus making a simple sort of (non secure) VLANning  possible
intirely in level3.
The other way around:
Use a secondary address on the seeding port of a router using NAT. When the
customer wants a firewall/proxy/whatever, set a static NAT rule for all traffic
for this  IP# to te firewall/proxy/whatever

Of course, there are other ways to accomplish this (NAT Pool etc.)

Erik


"Rampley, Jim" wrote:

> You get the benefit of being able to add another subnet to single router
> interface.  Such as:
> ip address 10.1.1.1 255.255.255.0
> ip address 10.1.2.1 255.255.255.0 secondary
>
> A drawback is that nodes connecting to that interface that are on the
> different IP subnets would need to bounce off the router to talk.  A better
> solution for this would be to change your subnet mask to 10.1.1.1
> 255.255.254.0.  Sometimes this is not possible in the short term if the
> addressing is not contiguous.
>
> Jim
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> [EMAIL PROTECTED]
> Sent: Wednesday, July 05, 2000 4:18 PM
> To: [EMAIL PROTECTED]
> Subject: Secondary IP address
>
> What are the advantages of using a secondary IP on and ethernet interface
>
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