[Linux-users] reverse dns

[vu pham]

Sent this below email this morning to linux-users at linux-sxs.org but it
never appeared.
So try again with panasonic :)

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When I run "w" on a server to show who are currently on the system, the
output also shows the dns names of the remote systems via the column
FROM. But I notice that all the systems which are under  the local dns
are displayed by their dns names, and all the others are displayed by ip
addresses.

I tried nslookup/ptr on the server and it can resolve the name of all
the remote systems just fine. Don't know why they are displayed by just
the ip addresses.

Any advice ?

Thanks,

Vu