ntpq: write to localhost failed: Network is unreachable
Anton Shterenlikht
mexas at bristol.ac.uk
Thu Jun 17 09:21:04 UTC 2010
On Wed, Jun 16, 2010 at 07:07:07PM +0100, Matthew Seaman wrote:
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> On 16/06/2010 18:15:32, Anton Shterenlikht wrote:
> > On Wed, Jun 16, 2010 at 06:08:35PM +0100, Matthew Seaman wrote:
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> >> On 16/06/2010 17:59:10, Anton Shterenlikht wrote:
> >>> After a recent upgrade to r209156 I get this error:
> >>>
> >>> $ ntpq -p
> >>> ntpq: write to localhost failed: Network is unreachable
> >>>
> >>> Please advise
> >>
> >> What does 'ifconfig -a' and 'netstat -rn' say?
> >
> > $ ifconfig -a
> > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> > options=209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC>
> > ether 00:13:21:5b:05:1c
> > inet 137.222.187.28 netmask 0xffffff00 broadcast 137.222.187.255
> > inet6 fe80::213:21ff:fe5b:51c%em0 prefixlen 64 scopeid 0x1
> > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> > media: Ethernet autoselect (1000baseT <full-duplex>)
> > status: active
> > em1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
> > options=209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC>
> > ether 00:13:21:5b:05:1d
> > media: Ethernet autoselect (100baseTX <full-duplex>)
> > status: active
> > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
> > options=3<RXCSUM,TXCSUM>
> > inet 127.0.0.1 netmask 0xff000000
> > inet6 ::1 prefixlen 128
> > inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
> > nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> >
> > $ netstat -rn
> > Routing tables
> >
> > Internet:
> > Destination Gateway Flags Refs Use Netif Expire
> > default 137.222.187.250 UGS 0 65512 em0
> > 127.0.0.1 link#3 UH 0 293 lo0
> > 137.222.187.0/24 link#1 U 0 10861 em0
> > 137.222.187.28 link#1 UHS 0 0 lo0
> >
> > Internet6:
> > Destination Gateway Flags Netif Expire
> > ::/96 ::1 UGRS lo0
> > ::1 ::1 UH lo0
> > ::ffff:0.0.0.0/96 ::1 UGRS lo0
> > fe80::/10 ::1 UGRS lo0
> > fe80::%em0/64 link#1 U em0
> > fe80::213:21ff:fe5b:51c%em0 link#1 UHS lo0
> > fe80::%lo0/64 link#3 U lo0
> > fe80::1%lo0 link#3 UHS lo0
> > ff01:1::/32 fe80::213:21ff:fe5b:51c%em0 U em0
> > ff01:3::/32 ::1 U lo0
> > ff02::/16 ::1 UGRS lo0
> > ff02::%em0/32 fe80::213:21ff:fe5b:51c%em0 U em0
> > ff02::%lo0/32 ::1 U lo0
> >
> >
> >
> >> What happens if you try and ping localhost?
> >
> > $ ping -c5 localhost
> > PING localhost (127.0.0.1): 56 data bytes
> > 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.109 ms
> > 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.103 ms
> > 64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.060 ms
> > 64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.059 ms
> > 64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.059 ms
> >
> > --- localhost ping statistics ---
> > 5 packets transmitted, 5 packets received, 0.0% packet loss
> > round-trip min/avg/max/stddev = 0.059/0.078/0.109/0.023 ms
>
> Nothing obviously wrong there. Perhaps ntpd is not running?
> (Not sure quite why that should cause an error message about
> reachability of localhost: I suppose it's not completely unreasonable
> though.)
>
> If ntpd is running, then try restarting it. If the problem still
> persists, then it looks like you've found a bug.
# ps ax | grep ntp
55043 ?? Rs 0:00.02 /usr/sbin/ntpd -c /etc/ntp.conf -p /var/run/ntpd.pid -f /var/db/ntpd.drif
55050 0 R+ 0:00.00 grep ntp
# ntpq -p
ntpq: write to localhost failed: Network is unreachable
# /etc/rc.d/ntpd restart
Stopping ntpd.
Waiting for PIDS: 55043.
Starting ntpd.
# ps ax | grep ntp
55113 ?? Ss 0:00.02 /usr/sbin/ntpd -c /etc/ntp.conf -p /var/run/ntpd.pid -f /var/db/ntpd.drif
55127 0 R+ 0:00.00 grep ntp
# ntpq -p
ntpq: write to localhost failed: Network is unreachable
#
Matthew, many thanks for your help.
I still think it's much more likely
the error is due to my misconfiguration
than a bug. I think I've seen something
like this before, just can't find anything
in mail archives.
I'll try asking on @current list.
thanks again
anton
--
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423
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