ifconfig hangs with proteon ringnet card.

[Ron Natalie]

I don't know if you got an answer yet, but the IFCONFIG will fail.
The problem is that the vv driver insists that the local net part
of the address match the hardware address.  Unfortunately, the local
area address at the point you do the ifconfig is still 24 bits long
since the subnet mask is not set, and you can't set the subnet mask
until the address is set catch-22.

Two soloutions:

For example to set the address to 18.88.0.12

ifconfig vv0 18.0.0.12 netmask 255.255.255.0
ifconfig vv0 18.88.0.12

The first 18.0.0.12 is just to make the thing happy on net 18 so you
can set the mask, then correct it with the second if config.

The other (better) solution is to modify vvioctl so that only the
least significant bits of the local net part of the address is compared
against the hardware address.

-Ron