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Cannot ping or RDP to expanded IP address range

Posted on 2010-08-17
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Last Modified: 2012-06-27
We have an expanded DHCP IP address range: 192.168.110.1-192.168.111.255

It appears that when clients are assigned an IP address in the 192.168.111.x range, we cannot ping or RDP to them from the 192.168.110.x range, and vice versa. The machines in the 111 range do have access to file shares and servers in the 110 range.

Our subnet mask is setup as 255.255.254.0.
Is that correct, or should it be changed? Any assistance would be greatly appreciated.
Thanks!
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Question by:eimonkey
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LVL 6

Expert Comment

by:Patrick Tallarico
ID: 33459293
Have you tried the 'All subnets are local' option in the Scope options?
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Expert Comment

by:kenycl
ID: 33459295
you should use a class b range instead

172.16.0.1 - 172.16.1.254
with subnetmask 255.255.254.0
instead.
use this subnet calculator
http://www.subnet-calculator.com

hope that helps
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Expert Comment

by:MISOperations
ID: 33459297
Change the subnet mask to 255.255.255.0
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by:kenycl
ID: 33459318
in theory you cant use 255.255.255.0 if you are changing the third octet
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by:Neil Russell
ID: 33459364
"Change the subnet mask to 255.255.255.0"
Nope that will restrict you to a class C address range
What you should be using is something like...
172.16.0.1 - 172.16.1.254
with a subnetmask 255.255.254.0
This is a Class B address and thats is technically what you should be using if you need more than 255 contiguos IP's
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Author Comment

by:eimonkey
ID: 33459808
stpmt11: yes we have the 027 All Subnets are local option [Value: 0x0] on that scope.
There is also a pen icon next to all the active leased 111. addresses in the DHCP range, which the error codes say indicates "Active lease, DNS dynamic update pending. This address is not available for lease by the DHCP server."

I can try changing the range to 172.16.x.x but that will take me a while to coordinate and implement if I need to change the static address on the servers. I'll get back to you on that.
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Accepted Solution

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eimonkey earned 0 total points
ID: 33459898
Update:
I found this article regarding the pen icon:
http://blogs.technet.com/b/networking/archive/2008/12/09/dhcp-shows-the-pending-update-icon-even-after-the-a-record-is-added-to-dns.aspx

Adding the Reverse Lookup Zone for the 192.168.111.0 Subnet got us to the point where we would ping the 111 clients, but RDP wasn't quite working yet. I'll follow through with the other steps and see how far I get.
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Expert Comment

by:kenycl
ID: 33460629
could it be blocking 3389 traffic for that subnet for some reason
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Author Comment

by:eimonkey
ID: 33469904
Update: slight improvment after applying the technet article from above
  • Pen icon removed from .111 DHCP clients
  • From .110: We can ping & RDP to .111 clients (if RDP is enabled)
  • From .111 can ping and RDP some .110 clients, but still having problems with others, esp .110 clients with DHCP addresses.
Still trying to troubleshoot & isolate the issue.


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by:Patrick Tallarico
ID: 33480801
Do you have reverse lookup zones for both subnets at this time, or just the .111?  We are currently running 6 different class C networks for different locations, each has its own reverse lookup zone, and all computers are in the same forward lookup zone.
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Expert Comment

by:Patrick Tallarico
ID: 33480833
Also, can you ping the IP address directly, or are you relying on DNS?  If you can ping, can you RDP?  

I'm sorry but I have been assuming that you have been only trying to ping/RDP using the hostname rather than the ip address.
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