2nd default gateway [updated]

Gery <[email protected]>
Newsgroups org.kernel.vger.linux-admin
Message-ID <[email protected]> 
Hi All,

I have Linux machine with 2 ethernet cards in different segments. Like
10.2.1.1 and 192.168.1.1
Do i need 2 default gateways in routing table? Please, give me an
example when it may happen.

[update]
The machine MAY BE connected to separate networks and i mean w/ 2 different 
routers. Security reasons, for example.
If such case, demands 2nd gateway?

Zaphod
thanks in advance
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