Brandon
VNET generates a dynamic MAC address based on the IP address of the host
Linux system. By default, all VNET MAC addresses start with 18:18
followed by the least significant 3 bytes of the host system's IP
address followed by 00.
So, if the host system IP address is 207.227.237.210, the Win4Lin VNET
MAC address will be 18:18:e3:ed:d2:00.
This way of allocating dynamic MAC addresses offers the best chance of
assuring uniqueness in a network of Win4Lin clients, and also provides
NeTraverse with a mechanism for assigning a range of MAC addresses to
multiple Win4Lin sessions running on the same system (cf. the NeTraverse
Server product).
Now to the question of specifying a static MAC address. Yes, this is
possible. There are parameters in /etc/default/merge that define the
range of MAC addresses that Win4Lin will use. If that range starts and
ends on the same address, that effectively defines a static MAC address
to be used by your Win4Lin session. The parameters you need to change
are:
MERGE_VNET_MACRANGE_START
MERGE_VNET MACRANGE_END
Only the least significant 4 bytes of the MAC address can be specified;
the most significant 2 bytes are always set to 18:18. The value needs to
be specific as 8 hexadecimal digits so, for example, if you want your
MAC address to be 18:18:01:23:ab:cd, then you need to set the MAC
address range parameters as follows:
MERGE_VNET_MACRANGE_START=0123abcd
MERGE_VNET MACRANGE_END=0123abcd
Make these changes, reboot the system and you now have a static MAC
address allocated to your Win4Lin session.
By the way, there are two other /etc/default/merge parameters that will
be of interest to anyone using VNET (or not, as the case may be).
Setting MERGE_VNETWORK=off will disable VNET totally. This is useful to
anyone who absolutely never wants to use VNET and hates the thought of
VNET modules and a daemon hanging around their system with no work to
do.
Setting MERGE_VNET_IFNAME=<interface name, e.g. eth1> can be used on a
system with multiple network interfaces to force VNET to use a specified
interface, rather than simply adopt the first interface as viewed in the
output of "ifconfig -a".
And, yes, we need to get this documented.
Best regards,
Brian
Darb wrote:
>
> So the next question would be... Is a Win4Lin install using a static
> MAC address or a dynamic one? Vmware uses a dynamic one by default, but
> they document how to set it to a static address.
>
> Netraverse, can you offer me a clue on that?
>
> *Brandon
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