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Red Hat Enterprise Linux Troubleshooting Guide by Benjamin Cane

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Identifying the issue

From the alert, we can see that our monitoring system was unable to perform ICMP pings to our company blog server. The first thing we should do is determine whether or not we can ping the server:

$ ping blog.example.com
PING blog.example.com (192.168.33.11): 56 data bytes
64 bytes from 192.168.33.11: icmp_seq=0 ttl=64 time=0.832 ms
64 bytes from 192.168.33.11: icmp_seq=1 ttl=64 time=0.382 ms
64 bytes from 192.168.33.11: icmp_seq=2 ttl=64 time=0.240 ms
64 bytes from 192.168.33.11: icmp_seq=3 ttl=64 time=0.234 ms
^C
--- blog.example.com ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.234/0.422/0.832/0.244 ms

It seems that we are able to ping the server in question, ...

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