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Re: [v6ops] New Version Notification for draft-ipversion6-loopback-prefix-00.txt

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Tue, 17 February 2015 00:31 UTC

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Date: Tue, 17 Feb 2015 00:31:31 +0000
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
To: Mark Andrews <marka@isc.org>, David Conrad <drc@virtualized.org>
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Subject: Re: [v6ops] New Version Notification for draft-ipversion6-loopback-prefix-00.txt
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So the fundamental problem is 'configured like this'. It's a manual operation to generate and apply a ULA. ULAs on loopbacks aren't going to well known or ubiquitous.

If you want something to be used you need to make it easy, and the best way to make something easy is to make it automatic.

The value in 127/8, ::1 and a larger IPv6 loopback prefix is that it is or would be automatically configured by the OS, with operator intervention. It's always there, and always available to use. The 4.1c/2.9BSD people though there was value in automatic configuration of the loopback address on a loopback interface, way back in 1982/1983:

http://minnie.tuhs.org/cgi-bin/utree.pl?file=2.9BSD/usr/net/sys/net/if_loop.c

http://minnie.tuhs.org/cgi-bin/utree.pl?file=4.1cBSD/a/sys/netinet/if_loop.c



----- Original Message -----
From: Mark Andrews <marka@isc.org>
To: David Conrad <drc@virtualized.org>
Cc: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>; "v6ops@ietf.org" <v6ops@ietf.org>
Sent: Tuesday, 17 February 2015, 10:22
Subject: Re: [v6ops] New Version Notification for draft-ipversion6-loopback-prefix-00.txt


We don't need *more* reserved address for this.  This is from my
laptop and it has been configured like this for years.

Yes, I have a ULA site on my loopback interface.  If your loopback
interface does not support this it is broken.


Mark

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
    options=3<RXCSUM,TXCSUM>
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
    inet 127.0.0.1 netmask 0xff000000 
    inet6 ::1 prefixlen 128 
    inet 10.53.0.1 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::1 prefixlen 64 
    inet 10.53.0.2 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::2 prefixlen 64 
    inet 10.53.0.3 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::3 prefixlen 64 
    inet 10.53.0.4 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::4 prefixlen 64 
    inet 10.53.0.5 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::5 prefixlen 64 
    inet 10.53.0.6 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::6 prefixlen 64 
    inet 10.53.0.7 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::7 prefixlen 64 
    inet 10.53.0.8 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::8 prefixlen 64 
    inet 10.53.0.9 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::9 prefixlen 64 
    inet 10.53.0.10 netmask 0xffffffff 
    inet6 fd92:7065:b8e:ffff::10 prefixlen 64 

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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