Hi,
We are using Nagios XI.
When we ping a host from Nagios XI GUI duplicate ping is appearing. Sample output is shown below.
PING 10.62.88.45 (10.62.88.45) 56(84) bytes of data.
64 bytes from 10.35.88.23: icmp_seq=1 ttl=246 time=143 ms
64 bytes from 10.35.88.23: icmp_seq=1 ttl=246 time=144 ms (DUP!)
64 bytes from 10.35.88.23: icmp_seq=2 ttl=246 time=142 ms
64 bytes from 10.35.88.23: icmp_seq=2 ttl=246 time=143 ms (DUP!)
64 bytes from 10.35.88.23: icmp_seq=3 ttl=246 time=136 ms
64 bytes from 10.35.88.23: icmp_seq=3 ttl=246 time=143 ms (DUP!)
64 bytes from 10.35.88.23: icmp_seq=4 ttl=246 time=136 ms
64 bytes from 10.35.88.23: icmp_seq=4 ttl=246 time=136 ms (DUP!)
64 bytes from 10.35.88.23: icmp_seq=5 ttl=246 time=136 ms
The device is an Access point and no ping service is configured for this device.
What could be the reason for duplicate ping(DUP!)
Pratap
Duplicate ping
Re: Duplicate ping
Hello Pratap,
Typically we see this when a device with the same IP address (with a different MAC address) is hitting it. Other reasons include incorrect load balancing, proxy, or redundancy setup. Also, note that this is expected behavior if you are pinging a multicast group.
Several options to take a look at to see what is going on.
Perry
Typically we see this when a device with the same IP address (with a different MAC address) is hitting it. Other reasons include incorrect load balancing, proxy, or redundancy setup. Also, note that this is expected behavior if you are pinging a multicast group.
Several options to take a look at to see what is going on.
- Use TCPDUMP command and import to Wireshark to see if anything of concern is going on.
- Increase the ping -t value to 60 to see if (dup) goes away, could be false feedback or noise.
Perry
Re: Duplicate ping
Thank you for the response. You may close this.
Regards,
Pratap
Regards,
Pratap