best practice for moving subnets?

Tom Schmitt TomSchmitt at
Thu Nov 18 07:20:54 UTC 2010

> Datum: Wed, 17 Nov 2010 15:41:45 -0400 (AST)
> Von: Bruce Hudson <Bruce.Hudson at Dal.Ca>
> Betreff: Re: best practice for moving subnets?

> >> The thing is, even if you change helper address, the clients will
> >> continue to use the old dhcp serves if there are
> >> network connectivity.
> > This problem I avoided by adding a next server statement to the old
> > dhcpd pointing to the new dhcpd.
>     I am not sure that the "next server" field does what you think it
> does. This is part of the old bootp protocol. Rather then identifying
> another DHCP server when a lease has to be renewed, it identifies the
> server to use in the next stage of the boot process. This would be a
> TFTP server from which the client would obtain its code image or its
> configuration file in most cases. 

You may be right. I'm also set the option "dhcp-identifyer" to the IP of the new dhcpd. Together it worked like I wanted it to, but you could be right and the next-server option may nothing have to do with it.
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