What did I do? (maybe in trying to set up samba and smbclient, maybe in setting up routing? firewall? - I don't know. A friend did some of it.)
Bottom line is my linux box can ping 2 pcs it's connected to (ethernet), and they can ping him ... but he can't ping himself--not by name, not by ip address and NOT by 127.0.0.1.
Therefore, ping and lpr (and probably more) complain that they "can't find the network" !!
Not incidentally, I really don't want to "just reinstall", 'cuz I'd lose the perfectly good ppp and firewall settings, and some lesser stuff I could redo myself. Samba has not yet worked, and has most likely been overconfigured.
What do I look for and what should I STRIP OUT to get my ordinary 127.0.0.1 back?
(Oh: one funny side effect of this is that SWAT works from the pcs, but not from the machine it's on!)
The current goal is to be able to PRINT to the Linux box' local printer!