Instead of using multiple NIC's a simple solution would be to alias your LAN
card with the number of card that you want. You can, by using this aliasing
feature, create logical 255 NICs (!!!) on your single physical NIC.
Architecture:
connect the cable from your LAN card onto a Switch(recommended)/HUB (costs
about Rs2000 for a new one or you may use the existing one). Conenct canles
from the networks that you want to connect to, into this switch/hub.
Assumptions:
I assume that you presently have a private network address of
129.168.3.24/255.255.255.0.
you want to connect to another network, say 172.16.0.0/255.255.255.0 on which
you will have an address 172.16.0.3
Try out these commands:
1) to configure your first interface (192.168.3.24):
ifconfig eth0 192.168.3.24 netmask 255.255.255.0
2) to configure your second interface (192.168.3.24) with aliasing using the
first NIC itself:
ifconfig eth0:1 172.16.0.3 netmask 255.255.0.0
3)[optional]provide your gateway (192.168.3.254):
route add default gw 192.168.3.254
4)check by doing a broadcast ping to both the networks
ping -b 192.168.3.0
ping -b 172.16.0.3
If there are are other hosts on your networks ,your ping should return results
from other hosts on your networks.
to make the changes permanent, put this commands (not the ping commands ;-) )
in your /etc/rc.local file.
happy aliasing
-santanu
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