walking (and cleaning) the routing table on mask change?

[Bakul Shah]

>   what do you think about cleaning the routing table on mask change?

I think it would be far easier and more correct to not allow
just the mask change (which is never really needed).

$ ifconfig tap0 10.1.1.0/24
$ netstat -nr | grep tap0
10.1.1.0/24        link#6             UC          0        0   tap0
$ ifconfig tap0 10.1.1.0/26
$ netstat -nr | grep tap0
10.1.1.0/26        link#6             UC          0        0   tap0