Howtoforge published a guide about monitoring network latency with Smokeping on Debian GNU/Linux 4.0

This guide shows how to install and configure Smokeping on Debian Etch to monitor network latency. From the Smokeping web site: "SmokePing is a deluxe latency measurement tool. It can measure, store and display latency, latency distribution and packet loss. SmokePing uses RRDtool to maintain a longterm data-store and to draw pretty graphs, giving up to the minute information on the state of each network connection.

Monitoring Network Latency With Smokeping (Debian Etch)