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Today's Topics:
1. Re: IPv6 formatting and RFC 5952 (Bob Harold)
2. Re: IPv6 formatting and RFC 5952 (Brian Candler)
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Message: 1
Date: Mon, 16 Jan 2017 15:41:40 -0500
From: Bob Harold <[email protected]>
Subject: Re: [Netdot-users] IPv6 formatting and RFC 5952
To: Brian Candler <[email protected]>
Cc: "[email protected]" <[email protected]>
Message-ID:
<CA+nkc8DX=beKpJD+bHqUFOaGuvLb--zE=ypk36+vqx5rops...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Sun, Jan 15, 2017 at 4:11 AM, Brian Candler <[email protected]> wrote:
> On 13/01/2017 20:38, Matt Zagrabelny wrote:
> > No opinions out there?
>
> I don't lose any sleep over it, but I think IPv6 should *never* show a
> netmask. Ever.
>
> As for caseness:
>
> * I'm fine with lower case as per the RFC.
>
> * If we're looking at this, then maybe the same should apply to MAC
> addresses too.
>
> * I note that MAC addresses are lower case when shown by ifconfig / arp
> under Linux.
>
> * IOS also uses lower case for MAC addresses, but upper case for IPv6
> addresses
>
> rtr1#sh ipv6 neighbors
> IPv6 Address Age Link-layer Addr State
> Interface
> FE80::EEBD:1DFF:FEF9:BAD9 0 ecbd.1df9.bad9 REACH Gi0/0
>
> So you can never be 100% consistent :-(
>
> Regards,
>
> Brian.
>
>
I understand that in IPv6, the actual 'netmask' given to a particular
client is supposed to be fixed at some value. But we often refer to CIDR
blocks of IPv6 addresses of varying sizes, so we need to show a 'prefix'.
But if you mean showing a prefix instead of the long 'netmask', then I
agree.
I prefer lowercase because it is easier to type.
--
Bob Harold
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Message: 2
Date: Mon, 16 Jan 2017 20:54:05 +0000
From: Brian Candler <[email protected]>
Subject: Re: [Netdot-users] IPv6 formatting and RFC 5952
To: Bob Harold <[email protected]>
Cc: "[email protected]" <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
On 16/01/2017 20:41, Bob Harold wrote:
> But if you mean showing a prefix instead of the long 'netmask', then I
> agree.
>
Yes, that's what I meant. Show "/56", don't show "ffff:ffff:ffff:ff00::"
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