All that's needed is ARP packets sent for each configured IP address,
advertising that IP address for the NIC's MAC address. The MAC
address controls the actual packet flow for ethernet.

OK, I must be having a duh-g moment here. Physically, how would the network
be wired?

Currently, it is simply:

( internet ) -- ( firewall & DHCP ) -- ( switches ) -- ( 520 & other
devices )

Now we add the WRT and wireless to the mix, using a different network base
address and subnet mask to isolate the traffic.

Where does the WRT attach to the network? From the WAN side to the regular
LAN switches? From the switch side of the WRT?

I did find this page which describes how to add multiple static IPs under
WinXP, provided they are in the same logical network but on different

So using that, can I just assign the PCs static IPs in each subnet, and add
the WRT to the regular LAN switch?

What about DHCP to the wireless handhelds? Won't the network be confused by
having two DHCP servers? Or can I avoid that by using the WAN side of the

Should the showroom PCs then be attached to the WRT switch, or the regular
LAN switches?

(The IP packets
are encapsulated in ethernet frames. The ethernet frames have the
source and target MAC addresses, not IP addresses.)

I don't think the NIC itself needs any particular smarts. The
operating system has to have the capability of configuring multiple IP
addresses for the same NIC and advertise them accordingly.

Redhat 9 Linux (yes, I know that's way past EOL) supports this easily,
with the multiple addresses in the same subnet or different subnets.

Opinions expressed are my own and do not necessarily represent the views
of my employer or anyone in their right mind.
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