I've been looking at setting up some bandwidth usage monitoring utilities...

One of the most popular seems to be MRTG.

I have it setup at home, but I want to do it for a client of mine. It'll be very helpful info to have for me since I'm not a full time admin, and I'm only around some of the time.

At home, its just on my LAN monitoring my router. Not a big deal... I have plenty of bandwidth to spare.

At my clients, it would be across a WAN and I don't want to use much bandwidth.

I know about the security implications.. and I'll place the propper access control.

I'm very curious as to how much bandwidth is used up by the reporting of SNMP?