Pix 501 Setup Help

Posted on 2006-07-08
Last Modified: 2013-11-16
Need some advice on configuring a Pix 501 Firewall.  We are switching our internet connection from DSL to T-1 and currently have our network configured for the DSL connection through a gateway

The T-1 goes through a Cisco D2431 8F-XS router.  

The default gateway they gave us is, subnet of
Static IPs of and  DNS servers &

Our network is small, 7 users running off a windows 2000 server.

Need to know how to connect and configure the firewall oth the network so our internal users can access the internet.

I have never set up a firewall before on a T-1, I am familiar with how to use the CLI however.

Any help would be greatly appreciated.

Question by:Tomxls
  • 4
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LVL 79

Expert Comment

ID: 17066058
There's no difference to the firewall what the router's wan connection is.
Is this PIX already in production, or brand new?
Very basic config from command line:

interface ethernet0 auto
interface ethernet1 auto

no dhcpd enable inside
no dhcpd adress inside

ip address outside
ip address inside

global (outside) 10 interface
nat (inside) 10
route outside

dhcpd address inside
dhcpd enable inside

That's it!

Expert Comment

ID: 17067796
The only thing I would add is inserting the "dhcpd dns" since dhcp are being hosted by the firewall.  Without this then your dhcp clients won't be able to access the internet.


Author Comment

ID: 17075818
Thanks for the help.

This is a new device to connect to the T-1 router.

Does the IP address of the PIX have to be changed to (the network default gateway).

I also have been told in the past to have my ISP disable DHCP in order to the workstations to connect to the internet, will I have to do the same with the PIX?

Will try your cofiguration and see what happens......

Thanks again!!
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LVL 79

Expert Comment

ID: 17076695
By default, the PIX is setup to be a DHCP server and to have as the IP address of the PIX. If your network is already 192.168.0.x and your systems are already set to use as their default gateway then it only makes things much easier to configure the PIX to match your network.
The router should not be doing DHCP. T1 is typically set up for you to make those decisions..

Author Comment

ID: 17076903
So then I have to add a line to the above configuration to change the IP address of the PIX?

What is the command to do that?

Thanks again
LVL 79

Accepted Solution

lrmoore earned 500 total points
ID: 17076926
First you have to disable the DHCP server and then you can change the IP

no dhcpd enable inside
no dhcpd adress inside
ip address inside

Author Comment

ID: 17077024
OK that makes sense will give it a go.

Thanks so much!!!
LVL 79

Expert Comment

ID: 17077535

Author Comment

ID: 17121963
Was not able to program the PIX using the above configuration.  I seem to have some issues with address pools and such that does not allow me to enter the above command string.

Besides that I may have a wiring issue I am running a crossover cable from the PIX to a Linksys switch and then to the T-1 router.  Nothing else in this is connected to the switch except the router and the PIX.   My thought is that the Linksys switch may not be able to handle the data speed?

Otherwise I am kind of at a loss at this point as to how to program the PIX.

Additionally the command "interface ethernet1 auto" errors saying I have to enter "100full" is this a problem also?


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