Hello,
for a long time i've been using KS-Soft's Hostmonitor (http://www.ks-soft.com/hostmon.eng) to monitor my network. The program is great, but it works only on Windoze...
I searched the net for something similar for linux, but sadly for now i cant' find alternative. I know cacti, and i'm using it. It does a great job for examining network load, environment changes (temperatures, humidity, etc.), but it's not a realtime sollution. I run the poller every minute, but with Hostmonitor i have critical test (backbone trunks, etc.), that run every second, and alerts with popup windows, sound, etc.
Can any software on linux do that? Even non-opensource one?
The test i use are two types - icmp ping and snmp checks (with formulas applied to the results). I like the tree-type structure, that Hostmonitor uses, and that it's not a web sollution.

Any help with finding such software will be greatly appreciated.

Thanks in advance.

hmmm, wireshark?

wireshark is more like a analyzing tool. You're probably looking for something like OpenNMS to monitor almost in real time.

big brother - http://www.bb4.org/features.html
big sister - http://www.bigsister.ch/
opennms
nagios
zenoss
zabbix
hyperic

the list goes on..

OpManager
http://manageengine.adventnet.com/pr.../download.html

I use Hobbit, and it's great, but I can't think of any application that give you one second resolution like you want. That sounds like a continuous ping stream to me, with some dinglefobbie attached to the ping output stream to catch it immediately should the reply time exceed xyz milliseconds.