Funny, isn’t it. The way things may have been setup on a network years ago and everyone thought were running fine. Then one day, small little niggly, nuisance things start happening. That is exactly what we were dealing with yesterday.
At a particular site, users had reported periodically being unable to browse to internal/LAN websites. A reboot or an ipconfig /release then ipconfig /renew would resolve it. Periodic, non-reproducible issues I don’t like but they happen all the time.
So, a quick rundown of the environment: