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user3047
Asked: 2009-05-19 12:58:54 +0800 CST

Configuring Cisco ASA 5505 for another IP address range

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We have a working connection to our ASA from our ISP, and we have it configured with an address range of:

Public LAN: xxx.xxx.xxx.xxx/28

Subnet Mask: 255.255.255.240

on the outside interface. We asked our ISP for another block of IPs, and they gave us another range of IPs:

Public LAN: yyy.yyy.yyy.yyy/28

Subnet Mask: 255.255.255.240

How can I add this new set of IPs to the outside interface on the Cisco ASA 5505?

cisco cisco-asa

2 Answers

  1. You just need to add them with the secondary switch i.e. from inside of the interface config

    (config-if)#ip address yyyy.yyyy.yyyy.yyyy 255.255.255.240 secondary
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  2. Best Answer

    We had to add a route on our gateway device, a router that was in front of the ASA. This was preventing the traffic from getting to the ASA. We routed all traffic to one of the working xxx.xxx.xxx.xxx addresses.

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