1
PING (ip) 56(84) bytes of data.
64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms 
64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms 
(hostname) 64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms 
(hostname) 64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms 
64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms 
(hostname) 64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms 
64 bytes from (ip): icmp_seq=1 ttl=116 time=22.3 ms
Bùi Quang Nam
  • 11
  • What implementation of ping are you using? – Stéphane Chazelas Feb 22 '23 at 08:05
  • 1
    What ping command are you running to produce this output? – Chris Davies Feb 22 '23 at 08:05
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Feb 22 '23 at 08:27
  • Each time the ping command receives a response, it performs a rDNS lookup against the IP address. It would seem that your system sometimes fails on that lookup. To ascertain why, you would need to interrogate the DNS on that system, perhaps there are multiple DNS servers involved which not all of them have the correct info. – Bib Feb 22 '23 at 13:44

1 Answers1

1

That looks to be the default behavior of ping. According to the man page, you can add the -n option to get numeric values only and not resolve host names.

Daniel Walker
  • 801
  • 1
  • 9
  • 35
  • 1
    I think the question shows an inconsistency in the output where some lines start with a hostname and others do not – Chris Davies Feb 22 '23 at 08:04