Quota Limit / Alarm on Certain Traffic

[pinoyboy]

Is there any way I can get a notification or alarm of some sort that tells me a certain user has surpassed their 100 MB badwidth limit on Internet usage?  Or can I pre-allocate how much surfing a certain IP range can do on the Internet?

I've seen posts on Radius use for this but not sure how or if it even does work - I am using Active Directory 2003 R2.

Thanks.

[hoba]

You could use the captive portal with radius accounting for this. Other option is to use the bandwidthd package or something external that receives information from the pfflowd-package. Search the forum, this has actually been discussed a lot and solutions are around.