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WatchGuard x1250e Device IP/Interface Change

We have a WatchGuard x1250e that has a trusted lan configured on eth1 (10.120.0.1/22), and a private mpls connection on eth6.  The mpls connection is being moved to a cisco 2950 router that is going to handle all the mpls routing and basically hand anything outside of mpls back to the x1250e to handle.

As part of this they want the cisco 2951 to become 10.120.0.1 and the x1250e to be 10.120.0.2.  

My question:  If I change interface 1 (eth1) using the watchguard system manager from 10.120.0.1/22 to 10.120.0.2/22 will that make the x1250e's ip address 10.120.0.2 or is it changed some other way?

When I tried to make the change initially it came up with a warning "the specified ip address does not match any of the interfaces specified in this config file" which at face value makes sense because there is no interface yet configured as 10.120.0.2.

I being cautious wanted to make sure I'm not going to be bricking the x1250e and after applying the change no longer be able to connect to it with WSM.  My assumption is that following the change I should be able to close the WSM and click the connect to device button and enter 10.120.0.2 and be good to go.  Can anyone confirm?

BTW, I am working on a second WG x1250e that is not in production at the moment.  Thanks for the feedback.
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hereiufund
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hereiufund
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NarendraGCommented:
There will be no issues at watchguard side but you have to change gateway of  all machines to  10.120.0.2 if already machine gateways poing to 0.1.

defiantly you will be able to connect with wsm.

I remember doing it couple of times.

Good Luck

Thanks

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hereiufundAuthor Commented:
Thanks NarendraG.  Worked like a charm.  I was just being paranoid I guess.  The cisco 2951 is going to be our new default gateway for voip/data on the lan and take 10.120.0.1.  It's going to hand off external traffic to the wg which is now 10.120.0.2.
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