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Advice on moving servers from one Subnet to another.

Hello,
I am after some advice on the following scenario.
We have 2 offices.  Office 1 has a subnet of 192.168.2.x
Office 2 has a subnet of 192.168.100.x.

Office 1 currently has only one server which is a DC, and office 2 has one DC, also an Exchange server, Web server, SQL server, and BES server.
Office 1 connects to office 2 with a point to point broadband link, we get all our services from office 2.
We want to move all the servers from office 2 to 1, what would be the best way to achieve this? my concern is routing, IP address etc.

Thanks
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BigBlueMan
Asked:
BigBlueMan
2 Solutions
 
AngloCommented:
There are a number of issues such as whether you map by DNS or IP to the various services.  If your routers are up to it you could create a second .100 subnet in office 1 and change office 2 to a new subnet.  Assuming the users in office 2 are dhcp you will need to configure dhcp pass through or make the router at office 2 the dhcp server for them.  The router in office 2 will also need a static route to .100 via office 1 and office 1 will need the route to the new subnet at office 2.  This seems to be the easiest option not knowing the answer to the DNS/IP mapping first mentioned.
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BigBlueManAuthor Commented:
we map with dns, for things like Exchange, CRM.
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AngloCommented:
It would be easy enough then to change the mappings to point to the .2 subnet in office 1 when the servers are moved over and changed to that range.  There will still be the DHCP issue with office 2 users and I would assume that the DNS would have to point to office 1 unless the router can be configured to offload/cache that as well.
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pwindellCommented:
Office 1 connects to office 2 with a point to point broadband link, we get all our services from office 2.
We want to move all the servers from office 2 to 1, what would be the best way to achieve this? my concern is routing, IP address etc.


You just move them.  Preferably one at a time so to keep control of the situation if something goes wrong.
As long as the routing between the Sites works then that is a non-issue.
As long as you don't break any applications when re-addressing the Servers they will be fine.
Allow DNS time to dynamically adjust the Host Records to the new addresses, so do it on a weekend.

DHCP isn't going to care about anything. It is not going to give out a "wrong" address because it will not give out an address for a subnet that does not match the subnets of the DHCP Server's Nic unless it was passed from a Relay Service on a LAN Router.  Remember that DHCP does care squat about what subnet it is physically sitting it,...all it cares about is if it has a Scope that matches the segment that the DHCP Query is coming from.  If the query comes from the local physical segment it acts accordingly if it has the correct scope, if not, then it ignores the request.  If the query is forwarded by the DHCP Relay on a Router then it acts accordingly, if not, then it ignores the request.

we map with dns, for things like Exchange, CRM.

What exactly do you mean by "mapping"?  DNS does not "map" applications,...it doesn't even really "map" anything.  Hosts all have "A" Records associated with them which should automatically adjust to the new IP.  Then there are CNAMEs,..but those do not tie to IP#s,...they tie to "A" Records,...so as long as the "A" Records dynamically adjust properly the CNAMES are fine.
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asavenerCommented:
Just move the servers, set all of the IP address properties correctly and you should be good.

You need to configure a DHCP relay at office 2, or use your router for DHCP.

You might also have to make changes to Active Directory Sites, so that the servers are listed in the correct site.
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BigBlueManAuthor Commented:
ok, thanks for the advice I am going to attempt to move the BES server this weekend as a trial run to see if it works correctly.
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QlemoC++ DeveloperCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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