[AusNOG] IPv6 defacto standards/conventions

Mark Andrews marka at isc.org
Fri Nov 25 16:19:36 EST 2016

In message <CAORX3KhwfATMWjJee1LisEDRDdgtc2u28WPtwHS_3snpaYFVcw at mail.gmail.com>
, Ryan Tucker writes:
> Hey,
> Just wanted to see what the current thoughts are on IPv6 addressing. What
> people have found or tried, whats worked and what hasn't, etc.
> Do you use/prefer /64s or /126s for interconnects?
> Are people dividing customers in to receiving a /64, /56 or /48, or just
> handing out /48s to everyone?

Give each customer *site* a /48.  There is zero need to stingy.

> How are customers handling addresses on endpoints without NAT (small sites
> multihoming, etc., is NPT popular?)

You don't NAT with IPv6.  For multiple PA's you use source routing
to send to correct packets to the correct provider.  Having multiple
addresses per interface is absolutely standard practice with IPv6.
You use different addresses for different functions.

I've got 7 at the moment on en0.

	ether 28:cf:e9:1b:50:8f 
	inet6 fe80::2acf:e9ff:fe1b:508f%en0 prefixlen 64 scopeid 0x4 
	inet netmask 0xffffffe0 broadcast
	inet6 2001:470:a001:4:2acf:e9ff:fe1b:508f prefixlen 64 autoconf 
	inet6 2001:470:a001:4:957c:74f9:ddb0:2de5 prefixlen 64 deprecated autoconf temporary 
	inet6 2001:470:a001:4::9ca prefixlen 64 
	inet6 2001:470:a001:4:2019:a8ef:acad:9499 prefixlen 64 deprecated autoconf temporary 
	inet6 2001:470:a001:4:c095:e029:5bb1:d854 prefixlen 64 deprecated autoconf temporary 
	inet6 2001:470:a001:4:851f:6b02:dd00:51f7 prefixlen 64 autoconf temporary 
	media: autoselect
	status: active

You advertise multiple addresses in the DNS if you have servers.

> Speaking of small multihoming, are ISPs/IXs accepting /48s in general, and
> if so do you see this leading to customers with a /48 from their ISP (of
> which there will be many) looking to peer publicly, and is that something
> you'd entertain?
> Do you see the inherent routeability of IPv6 affecting the appeal of
> "private WANs"?
> Didn't mean for that to sound like an interrogation, just got on a roll ;-)
> Thanks guys.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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