From user ping response time is flapping to Vserver in CSM.

drazik · ‎10-17-2004

hi

I tried check vserver in csm with ping.

the result is ping response time flapping that from pc to Vservers in CSM.

flapping is serveral time in 1 minute.

it's like following this

64 bytes from 169.140.127.242: icmp_seq=33 ttl=125 time=0.429 ms

64 bytes from 169.140.127.242: icmp_seq=34 ttl=125 time=0.441 ms

64 bytes from 169.140.127.242: icmp_seq=35 ttl=125 time=0.440 ms

64 bytes from 169.140.127.242: icmp_seq=36 ttl=125 time=0.430 ms

64 bytes from 169.140.127.242: icmp_seq=37 ttl=125 time=0.456 ms

64 bytes from 169.140.127.242: icmp_seq=38 ttl=125 time=2.24 ms

64 bytes from 169.140.127.242: icmp_seq=39 ttl=125 time=0.425 ms

64 bytes from 169.140.127.242: icmp_seq=40 ttl=125 time=583 ms <--

64 bytes from 169.140.127.242: icmp_seq=41 ttl=125 time=0.445 ms

64 bytes from 169.140.127.242: icmp_seq=42 ttl=125 time=0.491 ms

64 bytes from 169.140.127.242: icmp_seq=43 ttl=125 time=0.474 ms

64 bytes from 169.140.127.242: icmp_seq=44 ttl=125 time=2.20 ms

but from user ping response time is good, not flapping to Real server in Vserver serverfarm.

it's like following this

64 bytes from 169.140.127.205: icmp_seq=48 ttl=61 time=0.407 ms

64 bytes from 169.140.127.205: icmp_seq=49 ttl=61 time=0.358 ms

64 bytes from 169.140.127.205: icmp_seq=50 ttl=61 time=0.338 ms

64 bytes from 169.140.127.205: icmp_seq=51 ttl=61 time=0.395 ms

64 bytes from 169.140.127.205: icmp_seq=52 ttl=61 time=0.368 ms

64 bytes from 169.140.127.205: icmp_seq=53 ttl=61 time=0.361 ms

64 bytes from 169.140.127.205: icmp_seq=54 ttl=61 time=0.343 ms

64 bytes from 169.140.127.205: icmp_seq=55 ttl=61 time=0.352 ms

64 bytes from 169.140.127.205: icmp_seq=56 ttl=61 time=0.356 ms

please let me know why this happen? and what is solution?

thanks

Gilles Dufour · ‎10-21-2004

The CSM rate limit icmp traffic.

Also 583ms = 1/2 sec - not a minute.

Finally, monitoring a device using ping [whatever the device] has been not recommended since the creation of networking.

The purpose of a ping is to check if a device is alive, not to check if the device has good respond time.

If you want to test performance use TCP traffic using a traffic generator.

Spirent has very good products to do so.

Gilles.