I've compiled Nagios Core v4.3.1 on a Centos 7 virtual machine. It is running nicely, but I have a bunch of Cisco 2960 switches on a different subnet that are reported as flapping all the time. There are a firewall and a router between Nagios and the switches. Switches on the local network don't have this issue.
They are all just being checked with the check_ping command.
This is what I see in nagios.log.
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[1493253969] HOST ALERT: sw57;DOWN;SOFT;1;PING CRITICAL - Packet loss = 100%
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12:09:48.358761 IP 192.168.0.21 > 10.0.0.57: ICMP echo request, id 8323, seq 1, length 64
12:09:48.359402 IP 192.168.0.254 > 192.168.0.21: ICMP redirect 10.0.0.57 to host 192.168.3.3, length 36
12:09:48.359532 IP 10.0.0.57 > 192.168.0.21: ICMP echo reply, id 8323, seq 1, length 64
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12:10:48.364797 IP 192.168.0.21 > 10.0.0.57: ICMP echo request, id 8436, seq 1, length 64
12:10:48.365588 IP 10.0.0.57 > 192.168.0.21: ICMP echo reply, id 8436, seq 1, length 64
12:10:49.366350 IP 192.168.0.21 > 10.0.0.57: ICMP echo request, id 8436, seq 2, length 64
12:10:49.367092 IP 10.0.0.57 > 192.168.0.21: ICMP echo reply, id 8436, seq 2, length 64
12:10:50.367157 IP 192.168.0.21 > 10.0.0.57: ICMP echo request, id 8436, seq 3, length 64
12:10:50.367850 IP 10.0.0.57 > 192.168.0.21: ICMP echo reply, id 8436, seq 3, length 64
12:10:51.368594 IP 192.168.0.21 > 10.0.0.57: ICMP echo request, id 8436, seq 4, length 64
12:10:51.369307 IP 10.0.0.57 > 192.168.0.21: ICMP echo reply, id 8436, seq 4, length 64
12:10:52.369112 IP 192.168.0.21 > 10.0.0.57: ICMP echo request, id 8436, seq 5, length 64
12:10:52.369845 IP 10.0.0.57 > 192.168.0.21: ICMP echo reply, id 8436, seq 5, length 64
Thanks
David