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Question
Changing outside IP address on Cisco PIX 501 Firewall
Hello Experts,
I am trying to change the outside IP address of my firewall and not having much luck. Here's the situation.
The internet connection is SBC DSL and we have a bundle of 5 static addresses ranging from .105-.109 with .110 as the default gateway. Problem is, if I have the firewall log in to PPPoE as username@static.sbcglobal.
I am very familiar with the PIX's PDM interface but unfortunately not very familiar with its command line.
Thanks!
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by: plemieux72Posted on 2005-11-18 at 18:23:19ID: 15324492
First, do a "show route" to see what's on the PIX and paste that onto notepad so you can refer to it later if needed... This is optional but I would be curious how their DHCP/IPCP sets it up.
Anyway, the commands you need to change the IP address will be the following:
Note- I replaced the first 3 octets by 3's:
ip address outside 3.3.3.105 255.255.255.248 (I deducted this is the subnet mask they gave you since you say you have a subnet of 6 addresses)
Now, input a default route that will send all the traffic with a destination that the PIX doesn't know to route to 3.3.3.110 (the default gateway):
route outside 0.0.0.0 0.0.0.0 3.3.3.110
If the PIX absolutely requires a metric, use 1... but I don't think it will.
route outside 0.0.0.0 0.0.0.0 3.3.3.110 1