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[Qemu-discuss] "-net udp,..." not working on QEMU 2.0.0 ?

From: Willard Dennis
Subject: [Qemu-discuss] "-net udp,..." not working on QEMU 2.0.0 ?
Date: Fri, 25 Sep 2015 07:48:54 -0400

Hi all,

Using the CentOS 7 package of QEMU 2.0.0 ( package name = qemu-system-x86-2.0.0-1.el7.5.x86_64 ) and it's generally working fine. However, when I tried to use it with GNS3 (networking device emulation package) with a certain QEMU VM definition, it formed a directive in the QEMU command of the form of:

-net udp,vlan=1,name=gns3-1,sport=10000,dport=10001,daddr=

To which I'm getting the QEMU error:

Invalid parameter 'udp'

This syntax used to work in earlier versions of QEMU; it looks like the "-net udp,..." construct was added into QEMU back in early 2012 specifically to support the way GNS3 forms inter-VM network links. Can anyone here confirm that it has (or has not) been removed from QEMU as of version 2.0.0?

(BTW, I know the "-net ..." construct is marked as "legacy" now - see http://wiki.qemu.org/Documentation/Networking#The_legacy_-net_option - but in my case, I have to use it due to the way that the VM operation was designed [for more details, see: http://docs.cumulusnetworks.com/display/VX/Using+GNS3+with+QEMU+and+KVM+Virtual+Machines ])


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