Re: [lartc] Virtual Interface

[Roger Singh <rogerindia@gmail.com>]

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Mike,

Thanks. I will try it..
I have not explained the puspose for this doing this - just to give you an
idea I want to create around 200 virtual interfaces and send traffice
through all the interfaces simulating traffic comming from different
networks. Do you think this approach will scale to that level?

Roger


On 2/3/06, list user <nhgxfjijdrcd@mailinator.com> wrote:
>
> Hi Roger,
>
> [big snip: lost o.p.]
>
> There are a couple of different approaches you might try.  One is to use
> uml-utilities' tunctl to create an ethernet tap.   Another is to use the
> dummy interface.  With either method you can bridge, route, configure as
> you would a physical device using ifconfig and/or ip.
>
> The following methods work for me.  I use Fedora Core 4.  Its network
> setup methods are in /etc/sysconfig/network-scripts.
>
> cd /etc/sysconfig/network-scripts
> ln -s ifup-eth ifup-tap
> ln -s ifdown-eth ifdown-tap
> echo 'ip link show tap0 | grep "tap0" 2>&1 >/dev/null ||  tunctl -t tap0
> DEVICE=tap0
> TYPE=ethernet
> ONBOOT=yes
> BOOTPROTO=static
> MACADDR=5a:5a:5a:5a:5a:5a
> NETWORK=192.168.0.0
> IPADDR=192.168.0.1
> BROADCAST=192.168.0.255
> NETMASK=255.255.255.0' > ifcfg-tap0
> ifup tap0
>
> ln -s ifup-eth0 ifup-dummy
> ln -s ifdown-eth ifdown-dummy
> echo 'ip link show dummy0 | grep "dummy0" 2>&1 >/dev/null || {
> ip link set dummy0 up
> ip link set dummy0 arp on
> ip link set dummy0 multicast on
> }
> DEVICE=dummy0
> TYPE=ethernet
> ONBOOT=yes
> BOOTPROTO=static
> MACADDR=a4:a5:a5:a5:a5:a5
> NETWORK=192.168.0.0
> IPADDR=192.168.0.2
> BROADCAST=192.168.0.255
> NETMASK=255.255.255.0' > ifcfg-dummy0
> ifup dummy0
>
> If all went well there should now be two new virtual ethernet devices,
> tap0 and dummy0.
>
> Hope this information is useful to you,
> Mike Wright :m)
>
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