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I have to change the company IP addresses from one block to another. My
current plan is to replace the PIX entries one-to-one. For instance if
the IP addresses are

outside old outside new
inside
209.168.5.1 210.168.5.1
192.168.5.1
209.168.5.2 210.168.5.2
192.168.5.2
209.168.5.3 210.168.5.3
192.168.5.3
209.168.5.4 210.168.5.4
192.168.5.4

I replace old with new in the PIX config. The network is heterogeneous
with some Linux and some Windows. Do I need to change the IP addresses
on each machine's interface (currently the interface has inside IP
address) ? I am hoping I don't need to.

Also, how do I change the IP address of firewall itself?

Upstream to the firewall there is a router managed by our ISP. Do I
have to communicate the ISP to forward packets to the new firewall?

Thanks for your help

In article <. com>,
<> wrote:
>I have to change the company IP addresses from one block to another. My
>current plan is to replace the PIX entries one-to-one.

>I replace old with new in the PIX config. The network is heterogeneous
>with some Linux and some Windows. Do I need to change the IP addresses
>on each machine's interface (currently the interface has inside IP
>address) ? I am hoping I don't need to.

No, the inside machines should not notice.

>Also, how do I change the IP address of firewall itself?

Go into configure mode and command

Find the current IP used for the outside by using show ip
I have represented that address below with an X
Go into configuration mode and command

no ip address outside 209.168.5.X 255.255.255.0
ip address outside 210.168.5.X 255.255.255.0


>Upstream to the firewall there is a router managed by our ISP. Do I
>have to communicate the ISP to forward packets to the new firewall?

Yes.