Modem ADSL PIX501 and UK

Is it possible to interface a PIX 501 directly to a UK ADSL modem? If so is it an example of configuration available. Is he a PIX software release pre - req?

Hi Alan,

What you are trying to achieve is possible, if you have an IP address assigned by your ISP for the ADSL Modem interface (i.e. If an IP can be attributed to your ADSL modem, if not then router solution is the way to go) then what you need to do is configure the PIX with PAT (Port Address Translation), in this way all your home addresses will result in 1 public IP (ISP ADSL Modem IP) address. I assume that your facility would be something like this:


Here is an example in this example the PIX is directly connected to the ISP and the ISP assigns a unique public IP address for the PIX, which SHOULD be used on the external interface.

Here is the configuration that will allow the PIX to use the same IP address on the external interface using the address to make PAT for inside network devices.

(LAN( INSIDE_ROUTER( (inside_e1 PIX, PIX (outside_e0

PIX (config) # ip address outside

PIX (config) # ip inside address


PIX (config) # route outside 1

PIX (config) # the road inside 1


PIX (config) # global (1 external interface)

PIX (config) # nat (inside) 1 0 0

The foregoing, the nat command specifies that all internal addresses use the pool of addresses configured in the global order for pool 1. The corresponding overall command, but doesn't specify a pool of addresses, but done refers to the external interface. One of the advantages of this method are that if the ISP is not statically assign you the public address, but it uses DHCP to assign the address, you n t need to worry about what the address is assigned finally on the external interface as the parameter of the interface causes the PIX to use the address currently assigned, if it s assigned statically or dynamically.

Also, when you make changes (as above) do not forget to order 'clear xlate' and also command 'write the memory.

You can find useful the following URL:

I hope this helps your situation, let me know how you go.

Thank you - Jay

Tags: Cisco Security

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