When I add lines like the following to my hosts file on the machine puddleglum:
18.104.22.168 fred.puddleglum.mylocaldomain.com fred.puddleglum 22.214.171.124 lili.puddleglum.mylocaldomain.com lili.puddleglum 126.96.36.199 lulu.puddleglum.mylocaldomain.com lulu.puddleglum
something (!?!) comes along behind me and "corrects" these lines (it leaves the other lines alone) to simply:
188.8.131.52 puddleglum.mylocaldomain.com puddleglum
(The reason I am putting these lines in my hosts file is to be able to access virtual hosts on my Apache web server on puddleglum from puddleglum.)
BTW I'm using SuSE 8.2.