Then i can connect 100 scrypt rigs to one internet line easily?
Unfortunately the best ping time i have is 100 ms , i hope this not effect the mining.
id say you can run a 100 rigs id say youll be good up to about 4TH on sha and 500Mhs on scrypt (this is a safe limit youll probably be able to do more). the ping is a bit more of an issue as it takes longer to get and send work to the server so youll probably get a slightly higher stale rate on your shares but 100ms is still well within 1-2% stale range.