It's a home network, no other machine has any issues with ipv6. To diagnose this I ran the router with single cable to connected to ubuntu machine. Ran tcpdump + restarted network on ubuntu. "tcpdump ip6 -e -i eth0 | grep fd00" finds nothing, it's not being advertised via the network..
The only hit I got was when an upstream router refused a connection attempt from the ubuntu machine to fd00::1. I have also switched on debug for network manager & it appears to set the mystery line.. 15:22:14 storage-pc NetworkManager[349]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete. 15:22:14 storage-pc NetworkManager[349]: <warn> dnsmasq exited with error: Other problem (5) 15:22:14 storage-pc NetworkManager[349]: <debug> [1346822534.281528] [nm-dns-manager.c:598] update_dns(): updating resolv.conf 15:22:14 storage-pc NetworkManager[349]: <debug> [1346822534.281875] [nm-dns-manager.c:719] update_dns(): DNS: plugin dnsmasq ignored (caching disabled) 15:22:14 storage-pc NetworkManager[349]: <info> ((null)): writing resolv.conf to /sbin/resolvconf 15:22:14 storage-pc dbus[2184]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' 15:22:14 storage-pc dnsmasq[2875]: reading /etc/resolv.conf 15:22:14 storage-pc dnsmasq[2875]: using nameserver 192.168.1.1#53 15:22:14 storage-pc dnsmasq[2875]: using nameserver fd00::1#53 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1043599/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
