icmp ping on certain host always fail
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#41 icmp ping on certain host always fail
closed-fixed
5
2001-06-05
2001-03-25
No
Internal icmp ping on certain host always fail. Fping and external ping on this host works well. Icmp
ping on other hosts works. You can try it yourself, mail me for an IP address.
Another thing I have noticed, sometimes I get fping deviation failures, even between the agent
machine and the ethernet switch it's connected to. Haven't noticed any problem when trying fping
from shell. Agent and server machine is P100, 64M, Linux 2.2.17.
Logged In: YES
user_id=77961
Sorry for the long delay. I have not seen this problem
before. I would be very thankful if you could give me
the address of a host I can test this against
(=> aeby@graeff.com)
Best regards,
Tom
Logged In: YES
user_id=77961
Thank you very much for the test machine ...
It seems that the machine in question does not correctly
answer ICMP ECHO packets with data sizes < 18. Big Sister
by default sends no data when doing ICMP pings. You can
reproduce this behaviour with e.g.
ping -s 8 <yourhost>
(this will not work, while "ping -s 18 <yourhost>" does
work)
Since I see no reason why Big Sister should not include
some data with ICMP packets I incresed the default data
size of the ICMP ping check to 20. If you like you can
download the corrected uxmon/Monitor/ping.pm via CVS:
http://cvs.sourceforge.net/cgi-bin/cvsweb.cgi/bigsister/uxmon/Monitor/?cvsroot=bigsister
Thank you very much for reporting this bug!
Best regards,
Tom