Red Hat Bugzilla – Bug 11048
ping performs DNS lookups too often
Last modified: 2008-05-01 11:37:55 EDT
Unless you disable DNS lookups altogether with the -n option, ping performs
a DNS lookup every time it sends an ICMP echo. This is distinctly
anti-social behaviour, especially considering that the only reason it does
a DNS lookup is to make the output prettier.
This behaviour doesn't seem to occur with Redhat 6.0 and 6.1, presumably
because their ping comes from netkit-base rather than from iputils.
For reference, the maintainer of iputils seems to be
<email@example.com>, so I guess he should be contacted about this.
No kidding. If I give a numeric IP address to ping
I don't expect it to request and require DNS reverse
IPaddr-to-name entries to work. Geez. I just wasted
an hour trying to figure out what was introducing a large
random number of seconds delay when I did "ping 10.100.58.140"
and didn't use the "-n" option. I've been using ping for
20 years and never had to use the "-n" option for
this basic diagnostic tool to work before.
Please FIX. thanks.
An hour? I just lost five days to this "feature". DNS at my
work changed without notice, and I've been fighting ever since
trying to figure out why *all* my connectivity just stopped
working. tcpdump didn't turn up the dns queries, or I might
have noted it sooner.
*** This bug has been marked as a duplicate of 10436 ***