Re: [Xen-users] bonding + VLANs -> Oops/panic, no VLAN on 100 Mbit cards [SOLVED]

[Tomasz Chmielewski <mangoo@xxxxxxxx>]

Fajar A. Nugraha schrieb:

(...)

> > Also you wrote it earlier ("I doubt it would work as expected anyway,
> > since the only way to get bonding and vlan in domU is to detect line
> > status (which would be rather useless if the network problem happens
> > anywhere other than the switch)") - so I'm not sure what you mean.
> I believe it all comes down to your this line :
> I doubt it would work as expected anyway, since the only way to get
> bonding and vlan in *dom0* is to detect line status (which would be rather
> useless if the network problem happens anywhere other than the switch)
>
> I made a typo earlier, it should be dom0, not domU. The reasoning behind
> that statement is :
> 1. there are several method that linux ethernet bonding use for link
> monitoring, ARP monitor and the MII monitor
> 2. The best HA setup (IMHO) would be to use ARP monitor, and use router
> IP as arp target.
> 3. Using vlans means multiple networks and multiple routers are involved.
> 4. Checking only one router ARP (the router on native-vlan) isn't really
> good enough (for me anyway) since it doesn't check the conditions of
> routers on other VLANs
> 5. MII monitor only check whether the link (the switch or hub that your
> eth is connected to) is up. It doesn't really check whether the switch
> connection to the router is working properly or not.
>
> Which is why, IMHO, the best way to do bonding is in domU, and use dom0
> for VLAN and bridge.
> If you ever get a solution that would RELIABLY do bonding (as in capable
> of checking each VLAN's router ARP) in dom0, I'd love to hear about it :)
Well, with my current setup, bonding works on dom0.
As it appears,only "sort of" - I have two issues at least:

1) I have about 1-2% packet losses - without bonding, I don't have such 
losses at all
2) when I try to do "arping <some_host>" from a Xen host, that host 
completely looses network connectivity (domains using VLANs don't loose 
the connectivity, though). A workaround is to use "arping -i bond0 
<some_host>" - which is pretty strange, as hosts without Xen don't loose 
network connectivity in such case (yes, I understand that arping 
defaults to eth0 - but nevertheless, the host shouldn't loose network 
connectivity because of that).


Somehow, I don't like the way Xen messes with networking - as you said, 
I agree it's not that reliable :(

--
Tomasz Chmielewski
http://wpkg.org

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