Strange DNS Issue

Hi All,

I have a problem and solution, but need help understanding the cause. I have a laptop which is hardwired into our network with the wireless turned off. I set the static IP settings as follows


I am trying to contact device horstj-7 ( The device itself has the same gateway and DNS, but a mask of

I can ping with now problems. I can even do a ping /a and it returns the correct hostname. However, pinging horstj-7 returns "Ping request could not find host horstj-7..."

Changing the mask to the 240 subnet allows me to ping the hostname with no problems. Being curious, I changed to the 254 subnet. This should still work as my device is in the 0 range and the target is a 1. However, I can ping the IP with no problem, but not the hostname. Back to the 240 subnet and everything works fine.

I duplicated this same problem with another laptop. I noticed that there was no DNS entry in either DC for horstj-7. I added a Host (A) record, waited a few minutes, and did a force update on the laptop. It now works correctly regardless of the subnet.

This was obviously a DNS issue, but what could possibly cause the behavior where everything is fine if you are on ONE specific subnet mask? I would have thought that a DNS problem would be prevalent regardless of the mask.

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