-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have a script pinging my ISP (details below) and I don't understand the results. Some output:
> 2391 Thu Feb 26 01:14:39 2009 -- 5 packets, time 45ms == max rtt: > 351.654 ms > 2392 Thu Feb 26 01:14:45 2009 -- 5 packets, time 46ms == max rtt: > 344.855 ms > 2393 Thu Feb 26 01:14:50 2009 -- 5 packets, time 46ms == max rtt: > 340.359 ms > 2394 Thu Feb 26 01:14:55 2009 -- 5 packets, time 47ms == max rtt: > 345.226 ms > 2395 Thu Feb 26 01:15:01 2009 -- 5 packets, time 46ms == max rtt: > 356.115 ms > 2396 Thu Feb 26 01:15:06 2009 -- 5 packets, time 47ms == max rtt: > 350.294 ms > 2397 Thu Feb 26 01:15:12 2009 -- 5 packets, time 57ms == max rtt: > 341.351 ms > 2398 Thu Feb 26 01:15:17 2009 -- 5 packets, time 58ms == max rtt: > 350.854 ms What I don't understand is how the maximum round trip time can be 350 ms when it takes only 50 ms for the test. Can anyone explain this? Details: This is a perl script running on the server on my LAN. It does a 5 packet, 100 byte, ping flood (attempting to duplicate the Cisco router) every 5 seconds. The output is collected and munged, and displayed with the loop counter and a timestamp. I'm doing this because a couple times a day, nagios (a new installation on this same host) has been telling me the rtt to the ISP's border router (T1, half a mile) has been high. The vast majority of the time, the max rtt is 5 ms. The host is *very* lightly loaded (both cores 95%+ idle). It runs lenny from a software RAID1 on 2 SATA disks, no X. There's another script, running at the same time on the same host, that telnets into the router and pings from there. It's never reported a rtt higher than 25 ms -- I'm assuming that means I've got a problem somewhere, not the ISP / phone company. My first problem is deciding what my problem is... - -- Glenn English g...@slsware.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkmmsdMACgkQ04yQfZbbTLanEQCeNuXty6u2b27upSRWkCwfv7OI sWkAnRMwuKL59Yi64MnaKY42qq1hLxXi =BsC3 -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
