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Avatar of Richard Brodean
Richard Brodean

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Cisco ASA 5520 and FiOS DHCP config

Hey gang,

I'm trying to figure out how to get my ASA connected to my residential FiOS correctly. I've read different posts where you have to create a VLAN and assigned the cloned MAC address to it and assign the outside interface to that VLAN to get DHCP. Other posts say you can put the mac-address command on the outside interface itself. Conflicting information here. I've read to use ip route 0.0.0.0 0.0.0.0 dhcp or a setroute command not sure which to go with, or will they achieve the same thing.

Anyone have a scrubbed working config for their ASA --> FiOS that I can take a look at? If not, point me in the right direction?


Here is my outside interface config so far from what I've come across:

interface GigabitEthernet0/0
 mac-address 0c8d.db8f.3c98
 nameif FiOS_Outside
 security-level 0
 ip address dhcp setroute



Running ASA 5520 on version 9.1(7)19.

Be easy one me, not used to setting it up in a DHCP fashion. TIA
Avatar of CompProbSolv
CompProbSolv
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I can't provide you with the specific commands, but will suggest a direction.  I'd try to use as little of the FIOS hardware as you can.  If you are using it only for internet (and not TV), then I'd get rid of their router altogether.  You should be able to configure the 5520 to replace it as a router and as a DHCP server.  In my experience with Frontier, you don't need to clone the MAC address, though you may have to get one of their techs to reset the connection when you change to the 5520.

If you want to use the FIOS router as a wireless access point, give the LAN side of the FIOS router an address on the same subnet as the LAN side of the 5520, turn off DHCP on the FIOS router, and connect the LAN side of it to the LAN side of the 5520.
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