Re: [clug-talk] Ubuntu IPv6 breaks services with missing lo

[Roy Souther]

I went through the steps of what happens. When Ubuntu boots it has a lo but does not have any IP address on eth0 so I run dhclient on the command line. When dhclient is done I have a IP on eth0 but lo is dead. Here is the output.

[EMAIL PROTECTED]:/home/user# cat /etc/issue
Ubuntu 5.10 "Breezy Badger" \n \l

[EMAIL PROTECTED]:/home/user# ifconfig
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:5872 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5872 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:297689 (290.7 KiB)  TX bytes:297689 (290.7 KiB)

[EMAIL PROTECTED]:/home/user# ping -w4 -i4 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
Warning: time of day goes back (-104us), taking countermeasures.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.020 ms
Warning: time of day goes back (-477us), taking countermeasures.
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.000 ms

--- 127.0.0.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 4000ms
rtt min/avg/max/mdev = 0.000/0.010/0.020/0.010 ms
[EMAIL PROTECTED]:/home/user# ping -w4 -i4 google.com
ping: unknown host google.com
[EMAIL PROTECTED]:/home/user# dhclient
Internet Systems Consortium DHCP Client V3.0.2
Copyright 2004 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

sit0: unknown hardware address type 776
sit0: unknown hardware address type 776
Listening on LPF/sit0/
Sending on   LPF/sit0/
Listening on LPF/eth0/52:54:00:12:34:56
Sending on   LPF/eth0/52:54:00:12:34:56
Listening on LPF/lo/
Sending on   LPF/lo/
Sending on   Socket/fallback
DHCPDISCOVER on sit0 to 255.255.255.255 port 67 interval 5
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 10.0.2.2
bound to 10.0.2.15 -- renewal in 38164 seconds.
[EMAIL PROTECTED]:/home/user# ifconfig
eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::5054:ff:fe12:3456/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:590 (590.0 b)  TX bytes:720 (720.0 b)
          Interrupt:11 Base address:0xc100

lo        Link encap:Local Loopback
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:5970 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5970 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:307089 (299.8 KiB)  TX bytes:307089 (299.8 KiB)

sit0      Link encap:IPv6-in-IPv4
          inet6 addr: ::127.0.0.1/96 Scope:Unknown
          UP RUNNING NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:2 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

[EMAIL PROTECTED]:/home/user# ping -w4 -i4 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.

--- 127.0.0.1 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 3999ms

[EMAIL PROTECTED]:/home/user#

Royce Souther www.SiliconTao.com Let Open Source help your business move beyond. For security this message is digitally authenticated by GnuPG.

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