Re: Changing the default subnet route.

[David Young <dyoung%pobox.com@localhost>]

On Thu, Dec 04, 2008 at 10:59:53PM +0000, Roy Marples wrote:
> Following up with a test case which shows what I think is a kernel bug.
> I've tested this on NetBSD-4.0.1, 5.0BETA and 5.99.4 - all the same.
> 
> # ifconfig re0 alias 192.168.1.10/24
> # ifconfig ral0 alias 192.168.1.20/24
> # route change 192.168.1.0/24 -ifp ral0
> change net 192.168.1.0
> # ifconfig re0 -alias 192.168.1.10/24
> # ifconfig re0 alias 192.168.1.10/24
> ifconfig: SIOCAIFADDR: File exists
> # ifconfig re0
> re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 1 mtu
> 1500
> capabilities=3f80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx>
> enabled=0
> address: 00:50:8d:bb:da:f8
> media: Ethernet autoselect (100baseTX full-duplex)
> status: active
> inet6 fe80::250:xxxx:xxxx:xxxx%re0 prefixlen 64 scopeid 0x1
> 
> As you can now see, it's impossible to add or remove any address in the
> 192.168.1.0/24 range to re0 until the subnet route itself is removed.

How does this behavior of IPv4 ifaddrs compare with IPv6?

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933