zvlastni hodnoty pri pingu

arnost arnost na cs.cas.cz
Pondělí Červen 19 16:56:23 CEST 2000


Dobry den,

nedavno jsem narazil na zvlastni jev. Asi pred tydnem jsem zacal mit problemy s
NFS. Odezvy byly cim dal tim horsi a system obcas nahlasil nedostupnost
pocitace.  Pri pingu na stroj exportujici dany svazek se zjevily nasledujici
podivne hodnoty: 

64 bytes from 147.231.4.87: icmp_seq=161 ttl=64 time=19023.4 ms
64 bytes from 147.231.4.87: icmp_seq=162 ttl=64 time=18036.9 ms
64 bytes from 147.231.4.87: icmp_seq=163 ttl=64 time=17044.3 ms
64 bytes from 147.231.4.87: icmp_seq=164 ttl=64 time=16044.6 ms
64 bytes from 147.231.4.87: icmp_seq=165 ttl=64 time=15044.9 ms
64 bytes from 147.231.4.87: icmp_seq=166 ttl=64 time=14045.3 ms
64 bytes from 147.231.4.87: icmp_seq=167 ttl=64 time=13045.6 ms
64 bytes from 147.231.4.87: icmp_seq=168 ttl=64 time=12045.9 ms
64 bytes from 147.231.4.87: icmp_seq=169 ttl=64 time=11046.2 ms
64 bytes from 147.231.4.87: icmp_seq=170 ttl=64 time=10046.4 ms
64 bytes from 147.231.4.87: icmp_seq=171 ttl=64 time=9066.3 ms
64 bytes from 147.231.4.87: icmp_seq=172 ttl=64 time=8062.8 ms
64 bytes from 147.231.4.87: icmp_seq=173 ttl=64 time=7066.1 ms
64 bytes from 147.231.4.87: icmp_seq=174 ttl=64 time=6067.3 ms
64 bytes from 147.231.4.87: icmp_seq=175 ttl=64 time=5067.6 ms
64 bytes from 147.231.4.87: icmp_seq=176 ttl=64 time=4068.0 ms
64 bytes from 147.231.4.87: icmp_seq=177 ttl=64 time=3068.3 ms
64 bytes from 147.231.4.87: icmp_seq=178 ttl=64 time=2290.2 ms
64 bytes from 147.231.4.87: icmp_seq=179 ttl=64 time=1290.8 ms
64 bytes from 147.231.4.87: icmp_seq=180 ttl=64 time=291.1 ms

toto se periodicky opakovalo, jen obcas posloupnost nezacala od 19023 ale treba
od 9066 (i v tomto se dala vysledovat pravidelnost). 

Oba stroje byly propojeny pres jeden switch a dle diod byla zatez site ve
spickach asi 40%

nenapada nekoho vysvetleni te podivne pravidelnosti namerenych hodnot?

-- 
Arnost Stedry
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