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Re: [Qemu-discuss] User networking - bind to concrete interface/IP

From: profforgr
Subject: Re: [Qemu-discuss] User networking - bind to concrete interface/IP
Date: Fri, 15 Jan 2016 16:18:40 +0300

Using other types of networking (non-user mode) involves too much of 
configuration and used features. I know less about networking stuff, 
unfortunately and have no experience to configure it. It especially is harder 
because i need only few ports being forwarded to Virtual Machines (ports are 
unique so i bind them to all interfaces), others should be available for host 
machine only. I am not using iptables, netfilter and conntrack right now.

Was hoping such thing exists, because at other parts qemu is rather 

Current qemu network configuration looks like:

-netdev user,id=netdev1,hostfwd=tcp::6110-:6110 -device 

15.01.2016, 15:31, "Alex" <address@hidden>:
> There doesn't seem to be such an option for user mode network.
> You've considered multiple tap interfaces on the host, of course? It
> seems like a perfect fit to your requirements.
> On 15/01/16 14:52, address@hidden wrote:
>>  Hello.
>>  I have an issue.
>>  I have multiple QEMU virtual machines with User networking and have 
>> multiple network interfaces (eth0, eth0:1, eth0:2, eth0:3 and so on) with 
>> one public IPv4 address per interface.
>>  QEMU seems to always bind to eth0 interface (default). So virtual machine 
>> is always using static IP of eth0 interface.
>>  What i want is to bind each virtual machine to own interface.
>>  For example:
>>  Virtual Machine 1: qemu-system-i386 -netdev user,id=netdev1,interface=eth0 
>> -device rtl8139,netdev=netdev1,id=netdev1
>>  Virtual Machine 2: qemu-system-i386 -netdev 
>> user,id=netdev1,interface=eth0:1 -device rtl8139,netdev=netdev1,id=netdev1
>>  Virtual Machine 3: qemu-system-i386 -netdev 
>> user,id=netdev1,interface=eth0:2 -device rtl8139,netdev=netdev1,id=netdev1
>>  and so on.
>>  So my question is:
>>  Is there any way to bind qemu virtual machine's User networking to concrete 
>> interface?
>>  Thanks in advance for any answers,
>>  Alex.
> --
> /--Regards, Alex/

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