The BT ADSL router is the d/gateway for the PIX. The addressing on the inside of your network will probably not need to be changed. That means the the 877 will simply replace the BT router but use the same IP addressing between the pix outide interface and the current BT router IP address i.e. n.n.n.6
You have to configure the 877 router and there's no way out.
If BT are saying that their router is a 'No NAT' device, I am saying to you that your router will definately need to be configured for NAT.
If your outside interface on the PIX is configured with a public IP address then NAT will not be required on your router. Secondly, if the address on the PIX is public and was provided by BT then changes will inevitably be required on both PIX and replacement router (877).
It may take you a little while but it will save you ample time if you begin to read the basic and advanced configuration guides on the 877 device to start of with.
I'm afraid I don't have enough information in order to provide a sample config at this present momment in time.
I will try to explain this further..I am trying so please bear with me.
The reason I wanted to raise this question with all the experts was simply to ensure this router can do what we want it to do.
I have just come accross some terminology from Cisco called "ip unnumbered" by which you can use the same ip on two interfaces.
So looking at the existing scenario I cannot login to the BT rotuer but the rotuer all i know has only one ip = *.*.*.6 < BT allocated pool live ip ) and our firewall pix points to this ip as the gateway. There is no other network which exist between the BT router and the PIX.
Note: Our PIX firewall also has many different public ips "outside interface" for different services as mentioned in my earlier post.
So what I wanted to know in some detail if at all with examples....
Can we possibly make a 877 rotuer work in the similar fashion...we dont want the firewall features on this rotuer to block any traffic we want the PIX to do that work....so allow all traffic period and simply rotue packets between the BT network to our PIX and LAN and so on.
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