[Qemu-devel] qemu and -net tap networking

[Qemu-devel] qemu and -net tap networking

[Ritesh Raj Sarraf]

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Hi,

I'm using two instances of qemu (0.8.1) at a time.
I'm also using kqemu 1.3.0.pre7

One runs GNU/Hurd and the other runs FreeBSD.

Here are the configs I'm using for both.

Hurd:
rrs@learner:~ $ cat `which hurd-boot`
#!/bin/sh
qemu -M isapc -m
128 -hda /mnt/windows/qemu-debian-gnuhurd.img -hdb /mnt/windows/swap-qemu.img -fda /home/rrs/virtualization/qemu/hurd-floppy -net
nic -net
tap,vlan=0,ifname=tap1,script=/home/rrs/virtualization/qemu/qemu-net-script-hurd.sh -boot
a

FreeBSD:
#!/bin/sh
qemu -hda /home/rrs/virtualization/qemu/qemu-debian-freebsd -m 128 -boot
c -net nic -net
tap,vlan=0,ifname=tap2,script=/home/rrs/virtualization/qemu/qemu-net-script-freeBSD.sh


The scripts just do the work of assigning both of the tap interfaces
separate ip addresses and accordingly sets up ip_forwarding settings.

The problem is that when both are running, the one that boots second cannot
ping its gateway. If I halt the first qemu process and restart the second
qemu process, it works fine.

Is this a known behavior ?

I thought separating them with separate virtual networks would allow me to
run multiple qemu instances with full networking support.


TIA,
Ritesh
- -- 
Ritesh Raj Sarraf
RESEARCHUT -- http://www.researchut.com
"Necessity is the mother of invention."
"Stealing logic from one person is plagiarism, stealing from many is
research."
"The great are those who achieve the impossible, the petty are those who
cannot - rrs"
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Re: [Qemu-devel] qemu and -net tap networking

[Paul Brook]

<snip>
> The problem is that when both are running, the one that boots second cannot
> ping its gateway. If I halt the first qemu process and restart the second
> qemu process, it works fine.
>
> Is this a known behavior ?
>
> I thought separating them with separate virtual networks would allow me to
> run multiple qemu instances with full networking support.

The two instances are independent. The bug is almost certainly in your host 
configuration somewhere.

Paul

[Qemu-devel] Re: qemu and -net tap networking

[Ritesh Raj Sarraf]

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Paul Brook on Saturday 27 May 2006 02:35 wrote:

>> The problem is that when both are running, the one that boots second
>> cannot ping its gateway. If I halt the first qemu process and restart the
>> second qemu process, it works fine.
>>
>> Is this a known behavior ?
>>
>> I thought separating them with separate virtual networks would allow me
>> to run multiple qemu instances with full networking support.
> 
> The two instances are independent. The bug is almost certainly in your
> host configuration somewhere.

Thanks.

It was a networking issue and nothing to do with qemu.
Both instances are working perfectly now.

Ritesh
- -- 
Ritesh Raj Sarraf
RESEARCHUT -- http://www.researchut.com
"Necessity is the mother of invention."
"Stealing logic from one person is plagiarism, stealing from many is
research."
"The great are those who achieve the impossible, the petty are those who
cannot - rrs"
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