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Random IP errors

Posted on 2013-01-19
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Last Modified: 2013-01-25
Hi,

I have a Domain with 1 DC (also the only DNS server), 5 member servers and approx 30 workstations.
Mix of windows 2008 R2 enterprise, Win 7 pro and Win 7 Ultimate.

At random points I get a "Bad IP". I can not Ping between the device and the DC or log onto it.

I can not ping or connect to the DC until the IP address is changed to one that is free.
After a while, about a day or so the "Bad IP" become OK again.

Whilst the IP is "bad" any device with this IP address can not connect to the DC.

All the servers and workstations have static IP addresses.

Q, How can I see if the DNS is at fault. I ask this due to, the reverse is not updating or creating some entries.

thanx
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Question by:trevor1940
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Expert Comment

by:Perarduaadastra
ID: 38797237
Why are you using static IP addressing? The DHCP server that comes with Windows servers is very capable and saves a lot of network administration. If some computers need to have the same IP address all the time, set up DHCP reservations for them to make sure that they always receive the same address.

DHCP also takes care of gateway address and DNS server address provision, as well as some more esoteric options that I've rarely had to use.

In a scenario such as yours, the DC would usually be the DHCP server and would be the only computer on the network that actually needed a static IP. Routers and network printers often are configured with static IP addresses that are well clear of the DHCP scope, to avoid conflicts.

Is a DHCP server active on your DC, or for that matter on a router or switch on your network having that capability? If so, it might be trying to assign addresses that overlap the static IP address range that you are using and so cause the conflicts and errors that you are seeing.
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Author Comment

by:trevor1940
ID: 38797262
Perarduaadastra

Thanks, However.

We are talking DNS and static IP addresses. Sorry.

Due to network configuration (I have no control over this) I can not use DHCP. The servers and workstations will only be static.
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LVL 15

Expert Comment

by:Perarduaadastra
ID: 38797272
That must be frustrating - having the responsibility for the network but incomplete control over it...

However, the point about a DHCP server possibly being active on the network seems to me to be still worth checking out.

Also, do you have wireless on your LAN? If so, could the access point be picking up DHCP broadcasts from a different network, and upsetting the apple cart that way?
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Author Comment

by:trevor1940
ID: 38797293
Very,

The DHCP client services is running on the servers and the client.
Adding the DHCP roll was tried however this did not help.

No not wireless at all.
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Author Comment

by:trevor1940
ID: 38797972
From running DCDIGAG /test:DNS.

I get "Failed to delete test record dcdiag..."
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Author Comment

by:trevor1940
ID: 38798161
Right another update

I can MSTSC from the "BAD" IP to the DC
I can not MSTSC from the DC to the "BAD" IP

I have cleared both arp cashes.
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Accepted Solution

by:
trevor1940 earned 0 total points
ID: 38799356
Very strange.....

There was a rouge PTR entry that could not be deleted on its own.
I deleted and recreated the entire reverse range which allowed me to ping again!
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Author Closing Comment

by:trevor1940
ID: 38818020
Very strange fix i found myself
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