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Re: [Xen-devel] about network live connection during migration

To: Daniel Stodden <stodden@xxxxxxxxxx>
Subject: Re: [Xen-devel] about network live connection during migration
From: tgh <wwwwww4187@xxxxxxxxxxx>
Date: Mon, 10 Mar 2008 17:50:01 +0800
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Thank you
and you say ,"The unsolicited ARP is generated by the network frontend whenever it is brought up, as would be the case upon resume." that is , the guestos should be aware of its suspend-and-resume ,but xen maybe support the transparent migration for the guestos, that is ,the guestos does not know itself has been suspended ,is it?

but may be some action did the same thing  in the net backend, is it ?
and fake_arp() has not been found, it is helpful ,even though ,i have not found the code

could you or someone help me
i am still interested in the code for sending The unsolicited ARP after migration

Thanks




Daniel Stodden 写道:
On Sun, 2008-03-09 at 10:50 +0800, tgh wrote:
hi
I try to understand to the mechanism of live migration, and I read the code ,and have some confusion about the network live connection during the migration,could you help me, i read the paper about the live migration,it explaine that in a single switched LAN,host sends unsolicited ARP,and in router case, broadcastARP will not be accecpted ,and migratedOS need to sends to the interfaces in the ARPcache,while in a switched net,migrated OS holds the same MAC address,and network switch could detect the change of location, i am confused about where the code for all of these , could you give me some more detailed explanation or tell me where the code for these

The unsolicited ARP is generated by the network frontend whenever it is
brought up, as would be the case upon resume. look out for something i
believe is called fake_arp (?) in netfront. This is a very simple
operation, btw.

Unicasting to peers listed in the ARP cache is, to my knowledge, not
performed. I believe the paper just outlines what the alternatives would
look like.

regards,
daniel



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