>Hi, is it possible to subnet a class-C network with a netmask of
>255.255.255.128 ?
Yes.
>Now my new provider says this is illegal...
Your new provider is 2 RFCs behind.
AB
-- o Stamp out unauthorised relay-hosting. This SMTP "feature" shouldn't default "on" - See http://www.vix.com/spam/ and http://www.sendmail.org/antispam.html o Junk email returned, in bulk, back to sender; w/copies to all postmasters. o Received junkmail constitutes a request for aggressive site security probing.