assigning multiple ip addresses to ethernet port on 1750 router

[mkmodi]

Hi,'

We have a 1750 router with one ethernet port and two serial port. we want to connect the two serial port to two different ISPs for Internet access. Since each ISP has allotted us with two different sets of IP addresses and will allow packets from their IP address to pass through their network, we need to configure the ethernet port with 2 different ip addresses as in ip aliasing. Is it possible? If yes, How?

All suggestions are welcome.

Mahendra

[hbaerten]

Hi Mahendra,

you can configure a second ip address on an interface using the "secondary" keyword, like this:

interface ethernet0

ip address 10.0.0.1 255.0.0.0

ip address 192.168.0.1 255.255.255.0 secondary

You will also have to implement Policy Based Routing (PBR) to make sure that packets with a source address in ISP1's range go out via serial1 and likewise for ISP2.

See http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800c75d2.html for more info.

hth

Herbert