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FWSM: Secondary IP

Is it possible to use a secondary IP Address on the FWSM.

Customer wishes to migrate VLAN 1 behind the FWSM.

interface Vlan1
description "LEGACY VLANS"
ip address 192.168.2.1 255.255.255.0 secondary
ip address 192.168.1.1 255.255.255.0

Thanks,

Colm

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: FWSM: Secondary IP

The FWSM does not have a secondary ip address.

You can hack it to proxy for that ip by doing

static(interface_name,interface_name) 192.168.2.1 192.168.2.1

But that would just make the FWSM to proxy arp for that ip and receive the packets.

If your goal is for these packets to be destined to the FWSM itself for management it won't work.

If it is for through traffic it could make it work.

I hope it helps.

PK

1 REPLY
Cisco Employee

Re: FWSM: Secondary IP

The FWSM does not have a secondary ip address.

You can hack it to proxy for that ip by doing

static(interface_name,interface_name) 192.168.2.1 192.168.2.1

But that would just make the FWSM to proxy arp for that ip and receive the packets.

If your goal is for these packets to be destined to the FWSM itself for management it won't work.

If it is for through traffic it could make it work.

I hope it helps.

PK

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