multiple ip addresses on a sinle NIC

[Tally Jones <tally_jones () yahoo com>]

what are the implications of binding more than one IP addresse
on the same NIC card.( unlike having a multihomed gateway or
bastion host). each interface of NIC could be binded to more 
than one IP address....but why ?[ this is often done by ISPs
whom i cantacted lately and they said that this way they could
host more web servers on the same machine, instead of having a 
different host. each ip addrress mappeed points to a different 
directory ]

but what about the setting of the rules about Network access 
and Network address translation etc. how would they respond to
such a scenario. please email me a ccof your responses as i am
working on such a scenario and how it would compromixe security.

thanks in advance
tally jones




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