Comment 4 for bug 82711

The rt2500 part of this bug appears to be bug 78037. The by-hand fix there works (I need to do "sudo dhclient3 ra0" afterwards, and I have to apply the bug fix again by hand if I unplug the card).

The Netcomm card is actually a Netcomm 11g, and uses the prism54 driver. The same by-hand fix there works for this. Success!

So there's a workaround, if not an automatic solution. However, the same problem on different drivers suggests the cause might be at a higher level than the kernel.