Recently I was in troubled waters hence my network is under some kind of a flooding attack where the time value of ping went over 1024 for about 10 minutes.

I used Etherape (which is useful most of the time) to track from where the traffic was generating but was unable to pinpoint the source, finally by physically accessing a server which was the culprit was the one that used more than 80% os its bandwidth usage of the network card

I went through some Open Source Network Monitoring software but want to get an opinion from you all to get the best software for this king of outburst identification accurately.

Could you all suggest me a suitable software run on Linux