[...]
>> nagios
>> zenoss
>> cacti
>> zabbix
>>
>>
> [...]
>
> I have personally not used any of these software but I have seen
> Nagios used quite a bit in enterprises.
>
> Regards,
> Moinak.
>
I've personally tried nagios and didn't like! To monitor my network at
home with 9 servers and various networking equipment I use Munin and Cacti.
If you want to check bandwidth and who is connected to your network then
Ntop is a good idea; also awstats is great for web servers
.....but just my 2 cents worth :-)
I know there are many enterprise grade systems out there which you pay
for and researching those might be more usefull if you need something
specifically or to work at a certain level/grade. {depends on what you
want out of them really - provided that you have given that information
already!! however is really just preference in my opinion}