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I’m having some difficulties installing the Cisco ASA 5505 firewall at my company. We had an old firewall (Zyxel) which caused a lot of problems so I was recommended the ASA 5505 firewall from Cisco.

The old setup on the Zyxel was two Ethernet cables: A WLAN cable and a LAN cable. On the back of the Zyxel firewall it was fairly easy because there is only two sockets stating: WLAN and LAN so plug them in and there is connection to the Internet.

But when I’m trying to follow the same kind of pattern on my Cisco I get no connection. I plug the WLAN cable into the port 0 (the outside port) and a cable which runs up to our switch into port 1 (as it state in the manual) but I get no connection what so ever.

Right now, the configuration looks like this:

Internet --> Model --> ASA --> Switch --> PC’s and Servers

Am I missing something? I should say, it is my first time installing a hardware firewall so I might misunderstand something.

Thanks very much for your help.


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up vote 0 down vote accepted

Yes you're missing something. The ASA needs to be configured, not just plugged in.


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Could you might elaborate because I have a hard time seeing how to configure it. I try to do as the manual says and then type in ""; as it says but it is like it can't access it. – Mestika Feb 3 '11 at 17:17
My guess is that your internal network is not on the subnet. You should be able to connect a workstation/laptop directly to the internal interface on the ASA, configure the workstation/laptop with a 192.168.1.x/24 ip address/mask and connect that way. – joeqwerty Feb 3 '11 at 22:02
I would recommend using the serial console for the initial configuration. That way you can get the OS upgraded before putting it on the network. – Scott Pack Feb 4 '11 at 0:18
No need to be a dick with the answer :-) – James Cape Feb 4 '11 at 3:45
@James Cape: What? How is that? – joeqwerty Feb 4 '11 at 4:00

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