I'm running debian testing. Just did an apt-get update. who, w, finger, and last are all now printing the ip address instead of the hostname. the wtmp seems to have the ip address now instead of the hostname. Last shows hostnames up to when I did the apt-get update today and then ip addresses.
Is this expected? Is something in the works and this is in the process of changing?
I have to say in some ways this seems like a feature not a bug! I've long missed the option some other unixes have to inhibit resolving the name. But at the moment the hostname! Frankly, there should be an option to w, who, finger, and last to not resolve the addresses.