Who owns 122.45.5.1? you or your old ISP? Looks like APNIC uses that
range, so if you're switching to a new ISP you will not be able to use
that address for anything. You'll have to change all natting/vpns, and
update any vendor connections that are based on that old IP 122.45.5.1.
If you have addresses assigned to you by Arin, then create a /30
subnet(or what ever size) and use that for your external firewall
address & router Ethernet address. This will make it easier to move the
next time. Switch ISPs, have them announce your subnets, and move the
firewall and everything to a new router without changing anything on the
firewall.
-----Original Message-----
From: Mailing list for discussion of Firewall-1
[mailto:FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM] On Behalf Of Ray
Sent: Thursday, March 30, 2006 7:27 PM
To: FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
Subject: [FW-1] Question on default route to a new ISP while retaining
original IP
Running R55 on Nokia 3.9.
I currently have a router between FW-1 and the T-1's that supply our
Internet connection. We're changing ISPs and I want to eliminate the
router
because it doesn't really do anything useful (no filtering, etc.) and I
can
use it elsewhere. The new ISP comes in via fiber. I also must keep the
same
external IP address on FW-1. We have our own IP block and the new ISP
will
announce those routes for us.
So my external interface currently looks like this (made-up addresses):
IP: 122.45.5.1 /24
Next hop router - default route (mine) 122.45.5.254
The new ISP wants us to re-IP the firewall to
IP: 67.56.4.3 /30
Next hop router - default route: 67.56.4.4
Obviously if I change the external IP like this, all sorts of things are
going to break, like all of our vendors that expect traffic to come from
122.45.5.1. I do use central licensing.
Is it possible to set the external interface like this:
IP: 122.45.5.1 /24 (original address)
Next hop router - default route: 67.56.4.4 (new ISP)
or do they truly both have to be on the same subnet? If so, is there any
way
to fix this while still eliminating the old router and not manually
setting
NAT on every object? Or do I just have to keep the old router in place?
Thanks for any education you can lend,
Ray
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