Migrating to new network not possible in one haul or is it?

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Jun 30th, 2008
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My client, a hosting provider, will be migrating their client to a new network. The servers etc will get another public ip-address. Because some clients have quite a few servers I would like to be able to spread the migration period while still be able to direct the users of the clients to the appropriate servers etc. Some in the old network and some in the new network.

A suggestion is made to do this with load balancers.

Is this a good idea and are there other methods?

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trippi Mon, 06/30/2008 - 18:58
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You could do this with a router, just add a secondary IP address wtih the new network, or put a route to your firewall on the router of the new subnet...

jlaay-diode Tue, 07/01/2008 - 10:02
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Thanx for you answer, but you lost me.

Could you be just a bit more eleborate, please :).



trippi Tue, 07/01/2008 - 16:22
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Are the servers using public routable IPs? Or are they NAT'd? What kind of network device do you have in front of them??

jlaay-diode Wed, 07/02/2008 - 09:04
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Yes the servers are using public routable IPs. They are not NATted.

In front of the servers are one or more firewall and also in some occasions loadbalansers.



trippi Wed, 07/02/2008 - 09:48
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You can just assign the servers secondary IPs from the new block. Then, they will have two IPs, one from the new, one from the old...You could create a subinterface on the firewall.

jlaay-diode Mon, 07/07/2008 - 09:56
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Hi again,

I attached a diagram to explain my 'problem' maybe more clearly.

It concerns a partial move of some servers because the move can't taken place in a single service window.

Users workstation partially connect to an IP-address in stead of a DNS name.





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