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Need to configure Cisco 7204 interface to listen on multiple IP blocks

Posted on 2009-02-17
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Last Modified: 2012-05-06
I have a Cisco 7204 and need to configure one of the interfaces to listen on two IP blocks. The interface in question is FastEthernet0/0. I am not sure how to add a second IP address and gateway without overwriting the first set. Below is a snippet of the #show config. Right now I just have one IP route sending all traffic out the Serial2/0 interface. This router is sitting outside a firewall, so there should be no need for any fancy configuration.
interface FastEthernet0/0
 ip address xxx.xxx.xxx.xxx 255.255.255.240
 duplex full
 speed auto
 no mop enabled
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial2/0
 ip address aaa.aaa.aaa.aaa 255.255.255.252
 encapsulation ppp
 dsu bandwidth 44210
 framing c-bit
 cablelength 4
 serial restart-delay 0
!
ip default-gateway xxx.xxx.xxx.xxx (xxx IP block's gateway)
ip route 0.0.0.0 0.0.0.0 Serial2/0
no ip http server
no ip http secure-server

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Question by:alan2938
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JFrederick29 earned 2000 total points
ID: 23660251
Use the secondary keyword.

interface FastEthernet0/0
 ip address xxx.xxx.xxx.yyy 255.255.255.240 secondary

The gateway will remain the same via the Serial interface since I'm assuming your ISP is routing that new block to your serial interface.
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by:alan2938
ID: 23660259
Yes, thanks!
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