Merging and consolidating DHCP Server scopes with different subnet masks to a new scope

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hi there,

i need on following issue:

task:

dhcp migrations 2 windows servers 2003 (ad: windows server 2003) 2 new w2k 8 server r2 sp1 servers in new domain (ad: w2k8).

 scopes migrated:

1. first legacy server: server windows 2003 server

 1.1 scopes: 1 lan subnet: 255.255.00, length 16

1.2 scope: wlan scope subnet mask: 255.255.255.0, length 24

2. second  legacy server (w2k3), server b:

one scope subnet mask of 255.255.0.0, length 16

there no scope overlapping.

also, dhcp fault tolerance must implemented. done ‘merging’\consolidating scopes on each new server.

then implementing split-scope rule 80/20

while trying test approach on test server, not represent prod environment servers members of 1 domain: w2k8 got following results:

-->only scope(s) of 1 legacy server (server a, or server b) can migrated, unfortunately not of scopes on servers.

i following error when using migration method: netsh dhcp server export (import)

==

error while importing subnet x.x.x.x

this subnet exists on local server

==

this error comes when migrating or creating failing subnet manually.

 questions:

  1. how can prevent error message occurring?
  2. what recommended method merging dhcp scopes different subnet masks? possible?
  3. does  a microsoft tool exist, able merge dhcp scopes 1 scope?
  4. are there registry tweaks or powershell scripts may used accomplish task?
  5. is ad culprit in case?

i have searched net similar issues , have tried several methods of migration still not work.

please help.

thank you.

 

 

 

 

 

 

 

falke11

hi falke11,

thank post.

1.the error means import subnet authorized in domain, need unauthorized , stop old dhcp server.
2.just use netsh merging dhcp scope following kb281626
3.merge 1 scope? not exist tool. export , import dhcp address list, doesn't make sense.
4.to move dhcp windows 2003 windows 2008, suggest remove scope option first , follow kb962355.

if there more inquiries on issue, please feel free let know.

regards,
rick tan



Windows Server  >  Network Infrastructure Servers



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