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Re: New Version Notification for draft-petrescu-6man-ll-prefix-len-17.txt

tom petch <ietfc@btconnect.com> Fri, 10 May 2019 10:38 UTC

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From: tom petch <ietfc@btconnect.com>
To: "alexandre.petrescu@gmail.com" <alexandre.petrescu@gmail.com>, "sthaug@nethelp.no" <sthaug@nethelp.no>
CC: "ipv6@ietf.org" <ipv6@ietf.org>
Subject: Re: New Version Notification for draft-petrescu-6man-ll-prefix-len-17.txt
Thread-Topic: New Version Notification for draft-petrescu-6man-ll-prefix-len-17.txt
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Date: Fri, 10 May 2019 10:38:23 +0000
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----- Original Message -----
From: <sthaug@nethelp.no>
Sent: Friday, May 10, 2019 9:30 AM

>>> Why OSPF(v3) for IPv6 does not use an IPv6 address in the neighbor
ID,
>>> and why does it use an IPv4 address instead?
>> both OSPFv2 and OSPFv3 use a 32-bit instance ID, which is
>> traditionally represented as an ipv4 address. It's not actually an
>> ipv4 address.
>
> The 32bit instance ID responds to ping?

No.

> The 32bit instance ID is present in routing tables as next-hop?

No.

Think of it as a 32-bit *number*, not as an IPv4 address (because it
*is not* an IPv4 address).

<tp>
Absolutely, it is a 32 bit identifier with no semantics at all.

Trouble is, an all too popular manufacturer decided that one way to
specify it was to make it an IPv4 address as well - both 32 bit, what
could go wrong? - sothere are many who now think that it is, even must
be, an address that can be reached over the network.  If you have some
of this kit, and an IPv4 network, then you may indeed be able to use
those 32 bits as a source IP address or a destination IP address but
that would be a case of a manufacturer deciding to go over and beyond
the specification and making future development more complex.

Thank heavens the OSPF WG carried the right concept across to OSPF v3.

Tom Petch

Steinar Haug, AS2116

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