That could be done by NetworkManager, but is certainly not a bug. Some
other application running on your machine or another machine on your
network is advertising that it is a DNS resolver; which gets
NetworkManager to add it to /etc/resolv.conf; or an application on your
system is editing /etc/resolv.conf itself.
Please seek the help of your network administrator to figure out what
might be going wrong here; or you can always ask on AskUbuntu.com for
help from the community.
Since this is not a bug; I'm closing this report as Invalid.
** Project changed: network-manager => network-manager (Ubuntu)
** Changed in: network-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1043599
Title:
ping: unknown host intermittent
Status in “network-manager” package in Ubuntu:
Invalid
Bug description:
ping: unknown host intermittent, will work by name sometimes but not
others. I don't have a dns lookup issue as other machines can ping at
all times. Ping will work fine for some time then will suddenly stop.
A few minutes later it will start working again at all times I am able
to ping via ip address.
I am using both avahi (for ios devices airplay) and ipv6 on this host.
My dns is being provided by a router via DHCP that is always able to
ping by hostname and never seems to have this issue, my windows
machines never have this problem, again they are being served via DHCP
from the same router. I am not sure how to find the root cause of
this..
"Good result", ping working (removed few statistics lines)
+ date
Thu Aug 30 12:02:26 EST 2012
+ ping -c 1 wndr3700.home.int
PING wndr3700.home.int (192.168.1.1) 56(84) bytes of data.
64 bytes from wndr3700.home.int (192.168.1.1): icmp_req=1 ttl=64 time=0.247 ms
+ ping -c 1 wndr3700
PING wndr3700.home.int (192.168.1.1) 56(84) bytes of data.
64 bytes from wndr3700.home.int (192.168.1.1): icmp_req=1 ttl=64 time=0.193 ms
+ ping -c 1 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_req=1 ttl=64 time=0.194 ms
+ dig wndr3700
; <<>> DiG 9.8.1-P1 <<>> wndr3700
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37847
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;wndr3700. IN A
;; ANSWER SECTION:
wndr3700. 0 IN A 192.168.1.1
;; Query time: 0 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Thu Aug 30 12:02:26 2012
;; MSG SIZE rcvd: 42
+ ping -c 1 www.google.com
PING www.l.google.com (74.125.237.115) 56(84) bytes of data.
64 bytes from syd01s12-in-f19.1e100.net (74.125.237.115): icmp_req=1 ttl=54
time=33.1 ms
--- www.l.google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
+ ping -c 1 74.125.237.112
PING 74.125.237.112 (74.125.237.112) 56(84) bytes of data.
64 bytes from 74.125.237.112: icmp_req=1 ttl=54 time=34.4 ms
+ dig www.google.com
; <<>> DiG 9.8.1-P1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21787
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 11069 IN CNAME www.l.google.com.
www.l.google.com. 272 IN A 74.125.237.114
www.l.google.com. 272 IN A 74.125.237.113
www.l.google.com. 272 IN A 74.125.237.112
www.l.google.com. 272 IN A 74.125.237.116
www.l.google.com. 272 IN A 74.125.237.115
;; Query time: 21 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Thu Aug 30 12:02:26 2012
;; MSG SIZE rcvd: 142
+ ping6 -c 1 ipv6.google.com
PING ipv6.google.com(2404:6800:4006:803::1013) 56 data bytes
64 bytes from 2404:6800:4006:803::1013: icmp_seq=1 ttl=55 time=33.5 ms
+ ping6 -c 1 2404:6800:4006:803::1013
PING 2404:6800:4006:803::1013(2404:6800:4006:803::1013) 56 data bytes
64 bytes from 2404:6800:4006:803::1013: icmp_seq=1 ttl=54 time=33.3 ms
cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.1.1
search home.int
cat /etc/nsswitch.conf
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.
passwd: compat
group: compat
shadow: compat
hosts: files mdns4_minimal dns [NOTFOUND=return] mdns4
networks: files
protocols: db files
services: db files
ethers: db files
rpc: db files
netgroup: nis
"Bad result" ping no longer working (10 mins later..)
+ date
Thu Aug 30 12:13:27 EST 2012
+ ping -c 1 wndr3700.home.int
ping: unknown host wndr3700.home.int
+ ping -c 1 wndr3700
ping: unknown host wndr3700
+ ping -c 1 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_req=1 ttl=64 time=0.312 ms
+ dig wndr3700
; <<>> DiG 9.8.1-P1 <<>> wndr3700
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11476
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;wndr3700. IN A
;; ANSWER SECTION:
wndr3700. 0 IN A 192.168.1.1
;; Query time: 0 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Thu Aug 30 12:13:28 2012
;; MSG SIZE rcvd: 42
+ ping -c 1 www.google.com
ping: unknown host www.google.com
+ ping -c 1 74.125.237.112
PING 74.125.237.112 (74.125.237.112) 56(84) bytes of data.
64 bytes from 74.125.237.112: icmp_req=1 ttl=53 time=33.6 ms
+ dig www.google.com
; <<>> DiG 9.8.1-P1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5222
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 4, ADDITIONAL: 4
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 10407 IN CNAME www.l.google.com.
www.l.google.com. 210 IN A 74.125.237.114
www.l.google.com. 210 IN A 74.125.237.115
www.l.google.com. 210 IN A 74.125.237.116
www.l.google.com. 210 IN A 74.125.237.112
www.l.google.com. 210 IN A 74.125.237.113
;; AUTHORITY SECTION:
google.com. 10407 IN NS ns4.google.com.
google.com. 10407 IN NS ns1.google.com.
google.com. 10407 IN NS ns2.google.com.
google.com. 10407 IN NS ns3.google.com.
;; ADDITIONAL SECTION:
ns1.google.com. 10548 IN A 216.239.32.10
ns2.google.com. 4507 IN A 216.239.34.10
ns3.google.com. 10535 IN A 216.239.36.10
ns4.google.com. 10553 IN A 216.239.38.10
;; Query time: 23 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Thu Aug 30 12:13:29 2012
;; MSG SIZE rcvd: 268
+ ping6 -c 1 ipv6.google.com
unknown host
+ ping6 -c 1 2404:6800:4006:803::1013
PING 2404:6800:4006:803::1013(2404:6800:4006:803::1013) 56 data bytes
64 bytes from 2404:6800:4006:803::1013: icmp_seq=1 ttl=54 time=33.0 ms
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