[Sussex] Anyone into bondage?

[Jon Fautley]

Brendan Whelan wrote:
> Jon,
> 
> Thanks for the info.
> 
> On the connectivity, I mean that if the cable is moved from eth0 (Onboard
> NIC) to eth1 (Offboard NIC) then I cannot connect.

Bonding won't work in this manner. You need to have a cable connected to 
both interfaces for it to function correctly.

> I am using Fedora core 3.

Good Man :)

> Using "ifconfig eth0 up" and "ifconfig eth1 up"made no difference.
> 
> When the cable is connected to the onboard NIC:
> ethtool eth0|grep "Link" gave Link detected yes
> ethtool eth1|grep "Link" gave Link detected no
> 
> When the cable is connected to the offboard NIC:
> ethtool eth0|grep "Link" gave Link detected no
> ethtool eth1|grep "Link" gave Link detected no - the cable is obviously
> physically connected as one of the leds is on and another is flashing -
> presumably because the other end of the link is transmitting.

This means that the network card doesn't support link detection. Is this 
the Realtek NIC?

If the system can't detect a Link Down condition then you may run into 
problems with Bonding as the system will always think the NIC is OK and 
connected. You should try and swap the offboard for one with a different 
chipset.

Regards,

Jon

> ----- Original Message -----
> From: "Jon Fautley" <jfautley at redhat.com>
> To: "LUG email list for the Sussex Counties" <sussex at mailman.lug.org.uk>
> Sent: Thursday, September 29, 2005 3:29 PM
> Subject: Re: [Sussex] Anyone into bondage?
> 
> 
> 
>>Brendan Whelan wrote:
>>
>>>Jon,
>>>
>>>Thanks for the response..............
>>>The problem is that, when I try to use bonding, I can connect to the
>>>Ethernet socket on the motherboard but not to the one on a separate
> 
> card.
> 
>>>(When not bonded, if I configure the two Ethernet ports with different
> 
> IP
> 
>>>addresses then they both work.) Below are the various files and system
>>>information. I have executed:
>>>service network restart
>>>ifup eth0
>>>ifup eth1
>>>
>>
>>[SNIP]
>>
>>I'm not quite sure what you mean by this? When using bonding, the
>>seperate physical interfaces 'go away' and can't be used individually.
>>All network configuration or usage needs to go through the bondX device
>>(bond0 in your case).
>>
>>Do you mean that when you remove one of the network cables, it's not
>>working? I.e. you pull the cable from the onboard NIC and it doesn't
>>continue to use the offboard NIC?
>>
>>Try running 'ifconfig eth0 up; ifconfig eth1 up' and see if this makes a
>>difference. I don't think it will do, but it's worth a try ;)
>>
>>What mode are you running the bonding in? Are you using the default? (if
>>so, what Distro).
>>
>>it's worth checking that the system realises when you remove the cable
>>too, run ethtool eth0 | grep "Link" and see what it reports, both before
>>and after the cable pull. Try this for eth1 too.
>>
>>
>>>I don't know where the 169.254.0.0 is coming from as it isn't one of my
>>>addresses?
>>
>>That's the standard 'autoconfigure' address block as defined by RFC1918.
>>All systems that can't obtain a DHCP lease are entitled to grab a random
>>address in that range (169.254/16). It's most commonly used by Microsoft
>>Windows to enable NetBIOS over TCP/IP to function in a broken network
>>environment.
>>
>>Regards,
>>
>>Jon
>>--
>>Jon Fautley <jfautley at redhat.com>     direct: +44 1483 739615
>>  Presales Technical Consultant        office: +44 1483 300169
>>  Red Hat UK                           mobile: +44 7841 558683
>>  10 Alan Turing Road, Surrey Research Park, Guildford GU2 7YF
>>
>>
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>>
>>
> 
> 
> 
> 
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-- 
Jon Fautley <jfautley at redhat.com>     direct: +44 1483 739615
  Presales Technical Consultant        office: +44 1483 300169
  Red Hat UK                           mobile: +44 7841 558683
  10 Alan Turing Road, Surrey Research Park, Guildford GU2 7YF