good free unix based network monitors

[napster]

does anyone know of any good free unix based network monitors that will check ping, ftp, http, etc. on multiple hosts?

thanks,

[ProWebUK]

ServerStatus may be what your looking for

find it here ->-> http://www.rushland.net/projects.htm

Regards
Chris

[northwind]

Why not try pinging from different networks.

Try easymonitor. So far I like them better then alertra =P.

[TLP]

I use:
http://www.siteuptime.com/

Pretty good. (wOOt)

[netspace]

Monitoring Programs (require compiling and elaborate installs)...
http://nagios.org
http://www.penemo.org/
http://www.sysmon.org/
http://www.altara.org/mars.html
http://www.kernel.org/software/mon/
http://www.netplex-tech.com/snips/
http://bb4.com/


PHP Monitoring scripts...
http://www.opt-x.org
http://www.rushland.net/projects.htm (Server Status)
http://www.fluttstatus.com/

[Tris]

I would strongly reccommend nagios. I love it to be honest. The features are great. Its a strong program. If you know how to set it up and edit it where needed it is the best program ever.

The way I have set it up is to have a centeral server and all problems get reported to the centeral server. It took me a while to setup but it is better overall, saves a lot of trouble