<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2653.12"> <TITLE>Packet Monitoring </TITLE> </HEAD> <BODY> I have a problem. Using MRTG and Nagios I have determined that some very large data transfers are happening after hours. How do I pin down exactly who and what is being transfered?? I could use a sniffer but don't know which one could run all night and capture all packets on the network. Anyone know of a tool to help with this?? Thanks in Advance. </BODY> </HTML>