Re: [v6ops] draft-ietf-6man-rfc4291bis prohibiting non-/64 subnets

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--
Alexandre Petrescu
alexandre.petrescu@xxxxxx, tél 0169089223

Le 24/02/2017 à 19:36, Alexandre Petrescu a écrit :


Le 24/02/2017 à 19:21, Christopher Morrow a écrit :


On Fri, Feb 24, 2017 at 1:08 PM, Alexandre Petrescu
<alexandre.petrescu@xxxxxxxxx <mailto:alexandre.petrescu@xxxxxxxxx>> wrote:



    Le 24/02/2017 à 18:53, Christopher Morrow a écrit :


        yes, I think so.. for linux:
        $ sudo ip -6 addr add 2001:700:4::1 dev em1

        gets me:
         inet6 2001:700:4::1/128 scope global


    That address is good, but how about the routing table?  Does it get
    an entry like 2001:700:4::/64?


$ ifconfig em1
<snip>
          inet6 addr: 2001:700:4::1/128 Scope:Global
<snip>

and:
$ netstat -rnA inet6
Kernel IPv6 routing table
Destination                    Next Hop                   Flag Met Ref
Use If
2001:700:4::1/128              ::                         U 256 0
0 em1
<snip>
2001:700:4::1/128              ::                         Un 0   1
0 lo

that sure seems like i only got what I paid for.. on:
$ uname -r
3.13.0-92-generic

Looks good in linux world.

Alex

But, I would like to add that last time I checked (january 2015) the linux kernel complained in /var/log/messages when receiving an RA containing a plen 65. It called it "illegal" prefix length. That RA was sent over usbnet. There is no specification of IPv6-over-USB, there is no IID length requirement to be 64, because there is noo USB IEEE MAC address.

That was wrong at that time (call a 65 in RA "illegal"), I dont know whether it still the case. I may check in some time in the following weeks, and this is the question I will follow: is the linux kernel complaining when receiving an RA with a plen 65 on usbnet? If yes, then linux stilll has at least one problem with this 64.

What is sure is that there is still no IPv6-over-USB draft, so no IID 64 on USB.

It's a similar situation with cellular links instead of USB - no spec, but hidden assumptions about it being 64. They are all wrong.

Alex






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