Hello, Although UDP doesn't offer the same functionalities as TCP, regarding port numbers they work similarly. The client needs to bind a local port for the server to be able to send data in return (even if collectd doesn't need this, it's not something you can disable).
-- Regards, Manuel CISSE On 10/07/2010 07:58 PM, Enrico Tröger wrote: > On Sun, 3 Oct 2010 06:41:14 +1000, Amos wrote: > >> That's the way UDP works. > > Thanks so far. > But could you be so kind to explain it a little further? > I'm not that familiar with UDP and don't see why the clients need to > open a listening UDP port to send data to the server. > > Thanks, > Enrico > >> On 02/10/2010 11:09 PM, "Enrico Tröger" <[email protected]> >> wrote: >> >> Hi Guys, >> >> collectd is great! Thanks for this software! >> >> I'm using collectd on various servers to collect >> all the data and send it via the "network" plugin >> to a central instance where the data is stored. >> >> The central instance obviously opens an UDP port to >> receive the collected data from the "clients". >> But for some reason, even the clients open an UDP >> port. It seems the port number is chosen randomly >> as it changes on every restart: >> >> [13:03:25] r...@hefi (0): ~# netstat -tuplen | grep collectd >> udp 0 0 0.0.0.0:33549 0.0.0.0:* 0 762935590 32399/collectd >> [13:03:36] r...@hefi (0): ~# /etc/init.d/collectd restart >> Restarting statistics collection and monitoring daemon: collectd. >> [13:03:41] r...@hefi (0): ~# netstat -tuplen | grep collectd >> udp 0 0 0.0.0.0:52165 0.0.0.0:* 0 762945183 3310/collectd >> >> I'm wondering if this intended and/or others >> can confirm this behaviour. >> >> For testing, I disabled the "network" plugin >> and then collectd won't open the port. So, >> it seems strictly related to the "network" >> plugin. >> >> Here is my config of one of the clients: >> >> <Plugin network> >> <Server "<ip-des-masters>" "<port>"> >> SecurityLevel "Encrypt" >> Username "collectd" >> Password "<passwort>" >> </Server> >> </Plugin> >> >> >> collectd version: 4.10.1-1+squeeze1~bpo50+1 (Debian Stable / Backports) >> >> >> Any ideas? >> >> >> Regards, >> Enrico >> >> >> _______________________________________________ >> collectd mailing list >> [email protected] >> http://mailman.verplant.org/listinfo/collectd _______________________________________________ collectd mailing list [email protected] http://mailman.verplant.org/listinfo/collectd
