Home > PIX \ ASA, Production Story > PIX\ASA as DHCP server

PIX\ASA as DHCP server

After a long while I had a chance to work with our firewall. Part of the task was setting up our old PIX as DHCP server.

The configuration is simple:

dhcpd address 172.16.1.100-172.16.1.200 inside
dhcpd dns 172.16.1.1
dhcpd wins 172.16.1.2

You can see that the configuration is really simple but I found on interesting detail I wasn’t aware of: You can only use 256 addresses

Well, to be exact it is 253 addresses and it is a software limitation:

The size of the address pool is limited to 256 addresses per pool on the security appliance. This cannot be changed and is a software limitation. The total can only be 256.

One note – this limitation is per interface so if you have more than one inside interface you can use 253 addresses per interface.

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