Linuxconf only allows the administrator to enter 10 ip aliases per interface. 10 is probably OK for most users but the kernel limit is 255, and the linuxconf limit is a hinderance when running for example several ftp servers on the same system. - requires administrator to use netcfg (which past experience suggests is not sane) or manually create ifcfg- eth0:11 on up.
I'm sorry, i really hadn't noticed you can have multiple aliases on one line. my fault. a thousand apologies. gimme a snailmail address, I'll send cookies . . .