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Re: [Qemu-devel] [PATCH] Support for UDP unicast network backend

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH] Support for UDP unicast network backend
Date: Sun, 06 Nov 2011 14:54:22 +0100
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On 2011-11-06 21:55, Benjamin wrote:
> Follow-up of:
> http://www.mail-archive.com/address@hidden/msg81235.html
> This enables connections between Qemu, Dynamips and VirtualBox guests.
> Test it with:
> qemu-system-i386 -netdev
> socket,id=gns3,udp=,localport= -device
> e1000,netdev=gns3 /path/to/hard/drive/img1
> qemu-system-i386 -netdev
> socket,id=gns3,udp=,localport= -device
> e1000,netdev=gns3 /path/to/hard/drive/img2
> You should be able to set up a network between these two hosts.
> Any thoughts?

Looks good to me. Just one thing: localaddr vs. localport is
unfortunate. localport is actual "local host and port". So localaddr
would be a better fit, even with mcast continuing to expect it without

> I noticed an interesting behavior of Qemu and I'd like to investigate.
> When an IP address is assigned to an interface it sends a who-has ARP
> request with its own address. Which is not what happens on my OS. What
> would be the correct and standard behavior?

That's done by many OSes to discover IP conflicts early. Has nothing to
do with QEMU.


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