: What are the advantages of using a secondary IP on and
: ethernet interface
Advantage? Other then the fact it can be used to "patch together"
two networks in a bind, none. It can be considered harmful for
performance. Imagine:
Router: 10.0.0.1/24, and 172.16.0.1/24 secondary
Host A: 10.0.0.2/24
Host B: 172.16.0.2/24
Both hosts and the router are going to a single hub. Host A needs
to communicate with Host B. By utilizing it's IP and subnet mask,
Host A determines Host B is NOT on it's local network and thus
sends the packet to it's default gateway (the router).
The router, having the secondary address, knows that the destination
network (172.16.0.0/24) is actually on the same interface it just
received the packet from. So it ends up ARPing for Host B and
reencapsulating the packet right back out the same interface it just
came in from.
All return communication by Host B must go along the same path (Router-->
Host A) even though they are technically on the same wire.
Obviously, you would never want to design a network like this from the
ground up, but it's sometimes necessary until you're able to readdress,
redesign, or whatever the case may call for.
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