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Old 02-19-2010, 12:35 PM
Jim Tarvid
 
Default erratic network connections on Ubuntu 9.04

root@helen:~# uname -a
Linux helen 2.6.28-17-generic #58-Ubuntu SMP Tue Dec 1 21:27:25 UTC 2009 x86_64 GNU/Linux

This box has two Ethernet interfaces. The onboard nic - eth0 - connects to a Ciena 3290 and the Internet.


A cable cut in our upstream infrastructure yesterday resulted in eth0 and eth2 going down, eth0 coming up but eth2 remaining down until a reboot.

Feb 18 10:26:27 helen kernel: [3251918.453137] r8169: eth0: link down

Feb 18 10:26:30 helen kernel: [3251921.244552] r8169: eth0: link up
Feb 18 10:26:31 helen kernel: [3251922.156904] eth2: link down
Feb 18 21:50:17 helen syslogd 1.5.0#5ubuntu3: restart.
Feb 18 21:50:18 helen kernel: Inspecting /boot/System.map-2.6.28-17-generic


The upstream provider says the Ciena 3290 did not get a mac address from eth0 (ARP failure?)

On reboot dmesg says eth2 above is now eth1.

root@helen:~# dmesg | grep eth
[*** 1.329422] Driver 'sd' needs updating - please use bus_type methods

[*** 1.329430] Driver 'sr' needs updating - please use bus_type methods
[*** 4.289752] eth0: RTL8168c/8111c at 0xffffc200100cc000, 00:25:11:30:71:64, XID 3c4000c0 IRQ 2301
[*** 4.309690] eth1: RealTek RTL8139 at 0xe800, 00:0e:2e:55:a1:ed, IRQ 22

[*** 4.309692] eth1:* Identified 8139 chip type 'RTL-8100B/8139D'
[*** 9.186289] udev: renamed network interface eth1 to eth2
[** 12.338871] r8169: eth0: link up
[** 12.338876] r8169: eth0: link up
[** 12.340735] eth2: link up, 100Mbps, full-duplex, lpa 0x43E1


but ifconfig and route report the usual devices

eth0***** Link encap:Ethernet* HWaddr 00:25:11:30:71:64*
********* inet addr:208.94.92.222* Bcast:208.94.92.223* Mask:255.255.255.252
********* inet6 addr: fe80::225:11ff:fe30:7164/64 Scope:Link

********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1
********* RX packets:1174879 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:1230138 errors:0 dropped:0 overruns:0 carrier:0
********* collisions:0 txqueuelen:1000

********* RX bytes:103241356 (103.2 MB)* TX bytes:376658406 (376.6 MB)
********* Interrupt:253 Base address:0xc000

eth0:0*** Link encap:Ethernet* HWaddr 00:25:11:30:71:64*
********* inet addr:208.94.89.129* Bcast:208.94.89.191* Mask:255.255.255.192

********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1
********* Interrupt:253 Base address:0xc000

eth0:1*** Link encap:Ethernet* HWaddr 00:25:11:30:71:64*
********* inet addr:208.94.89.130* Bcast:208.94.89.191* Mask:255.255.255.192

********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1
********* Interrupt:253 Base address:0xc000

eth2***** Link encap:Ethernet* HWaddr 00:0e:2e:55:a1:ed*
********* inet addr:172.17.100.5* Bcast:172.17.100.7* Mask:255.255.255.252

********* inet6 addr: fe80::20e:2eff:fe55:a1ed/64 Scope:Link
********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1
********* RX packets:2703 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:9097 errors:0 dropped:0 overruns:0 carrier:0

********* collisions:0 txqueuelen:1000
********* RX bytes:393990 (393.9 KB)* TX bytes:3868877 (3.8 MB)
********* Interrupt:22 Base address:0xe800

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:17791 errors:0 dropped:0 overruns:0 frame:0
********* TX packets:17791 errors:0 dropped:0 overruns:0 carrier:0

********* collisions:0 txqueuelen:0
********* RX bytes:1763424 (1.7 MB)* TX bytes:1763424 (1.7 MB)

root@helen:~# route

Kernel IP routing table
Destination**** Gateway******** Genmask******** Flags Metric Ref*** Use Iface

172.17.100.4*** *************** 255.255.255.252 U**** 0***** 0******* 0 eth2
208.94.92.220** *************** 255.255.255.252 U**** 0***** 0******* 0 eth0
208.94.89.192** 172.17.100.6*** 255.255.255.192 UG*** 0***** 0******* 0 eth2

10.4.0.0******* 172.17.100.6*** 255.255.255.0** UG*** 0***** 0******* 0 eth2
10.5.0.0******* 172.17.100.6*** 255.255.255.0** UG*** 0***** 0******* 0 eth2
default******** 208.94.92.221** 0.0.0.0******** UG*** 100*** 0******* 0 eth0


root@helen:/etc/network# cat interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface

auto lo
iface lo inet loopback

# The primary network interface
#auto eth0
#iface eth0 inet dhcp

# Alias for Internet access via primary interface
# Added to /etc/network/interfaces in preparation of cutover

# Uncomment the next seven lines
auto eth0
iface eth0 inet static
*** address 208.94.92.222
*** netmask 255.255.255.252
*** broadcast 208.94.92.223
*** network 208.94.92.220
*** gateway 208.94.92.221


auto eth0:0
iface eth0:0 inet static
*** address 208.94.89.129
*** netmask 255.255.255.192
*** broadcast 208.94.89.191
*** network 208.94.89.128

auto eth0:1
iface eth0:1 inet static
*** address 208.94.89.130

*** netmask 255.255.255.192
*** broadcast 208.94.89.191
*** network 208.94.89.128

auto eth2
iface eth2 inet static
*** address 172.17.100.5
*** netmask 255.255.255.252
*** up ip route add 208.94.89.192/26 via 172.17.100.6

*** up ip route add 10.4.0.0/24 via 172.17.100.6
*** up ip route add 10.5.0.0/24 via 172.17.100.6

Several questions:

1) would an upgrade to 9.10 help?

2) is there a simple watchdog that would test upstream connectivity periodically and bounce the interface is there is none
3) same for downstream?
4) can the link down for eth2 be prevented?
5) is there a way to refresh detection of eth2?


Seems like Hotel California. I am stuck in Networking 101.

TIA

Jim
--
Rev. Jim Tarvid, PCA
http://ls.net
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http://crossleft.org



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