I have 2 Cisco PIX 525 Firewalls and I don't have any router.

They are running version 7.2.

Can i use that as a Layer 3 router and use its interfaces for different subnets?

1 Answer 1


In the immortal words of Cisco (circa 1999), "the PIX is a firewall, not a router"

That said, it can be used as a router. But you're better off using anything else, as it's firewall nature is going to be a pain in the ass. (I used to do it with a PIX 520, and I hated it for all time.) If it's what you have, then it's all you have, but I cannot over emphasize how much better off you'll be with an actual router. (buy one, build one, whatever it takes.)

  • 2
    (build one == a PC, a box of NICs, and linux or freebsd)
    – Ricky
    Mar 28, 2014 at 4:22
  • Actually i have one router 2600 but it has only one ethernet inetrface. i need atleast two interfaces. or can we do with one interface. its just my small home lab. that firewall i got for 50 bucks :)
    – Mirage
    Mar 28, 2014 at 4:47
  • One interface, a couple of vlans and a managed switch? Mar 28, 2014 at 13:45
  • @TomO'Connor yes
    – Mirage
    Mar 29, 2014 at 6:26

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