ROUTABLE SUBNET QUESTION

[rajesh444]

Currently, we have a Cisco 7206 router with 1 FastEthernet interface configured for with an IP from a routable subnet we use. There is another routable block [Class C] that we split into 4 /26 blocks. We want to use 2 of these /26 blocks on the this router.

From the ISP side, routing has been done for these address blocks.

Do I need to have a physical router interface for each block that I want to use?

I tried configuring a loopback int. on the 7206 with an IP from one /26 block with the PIX firewall performing a NAT using IP from the same block but we are unable to access this IP from the Internet.

Please advice.

Thanks,

RAJ

[rsissons]

I am not sure I completely understand your question but you need a separate physical interface in the router for each different network address unless you use secondary addresses to map multiple network addresses to the same interface.

[rajesh444]

Thanks for the suggestion. Do you know of any Cisco links/documentation available on secondary interfaces?

Thanks,

RAJ

[ndarnell]

You either have to have seperate physical interfaces or alternatively if you have a switch you could setup a trunk and use sub-interfaces for each subnet