Many thanks to Ixthusdan, dacp06, & Arthur for the encouragement; and for pointing me in the direction of my firewall. That was the problem. However, I think I badly implemented Arthur's suggestion for interim firewall protection. I installed iptables_ipv6_1.2.8.2mdk (to Mandrake 9.2) preparatory to entering "ipables -A INPUT -i ppp0 -p tcp --syn -j DROP" - but now I never get far enough for the latter.
My attempts to estabish a ppp connection fail with a "Couldn't find interface ppp0" diagnostic; and this was true after the install and is still, after I backed it out again. Does anyone have a suggestion of how I can get past "Couldn't find interface ppp0"? I figure, at worst, I'll just reinstall Mandrake.
Thanks again.
Trish