Here's a very strange thing I've noticed happening.
At a clients facility, on one of their wireless networks, I can successfully ping "gibberish" DNS addresses without any suffix.
In other words, I can write
ping asdhkahsdkjaskdjska and it'll resolve.
C:\ping sdlkjaksda Pinging e11547.dsca.akamaiedge.net [220.127.116.11] with 32 bytes of data: Reply from 18.104.22.168: bytes=32 time=20ms TTL=60 Reply from 22.214.171.124: bytes=32 time=19ms TTL=60 Reply from 126.96.36.199: bytes=32 time=19ms TTL=60 Reply from 188.8.131.52: bytes=32 time=19ms TTL=60
Pining a gibberish address which contains a suffix (like the above, but with added
.com at the end) produces the expected result of the ping / address resolution to fail.
This only seems to happen on my machine, however, and only on one of the two wireless networks the client has.
I've no idea what this could be - I can't tell if my machine is infected, or if the problem affects machines not registered in the clients domain... or anything else. I feel like this probably isn't a virus on my machine, since it seems a bit too targeted - the issue doesn't exist when I'm at home / at work, only in this one specific network belonging to one of my clients. On the other hand, the target IP belongs to a content delivery service / cloud service of some kind - those are often used to deploy malicious content... but on the other-OTHER hand, that IS one of the largest content delivery networks on the planet, so...
Also, I've tried to narrow the problem by using
nslookup in Windows, but that instantly fails and yields no further clues as to what is happening.
What could possibly be happening here?
EDIT: Further inspection revealed it's not just on my laptop. Other machines (albeit not all) in this network also resolve bogus DNS addresses to the same IP. So it's definitely not anything on my machine.