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RE: encoding Subnet ID in link-local addrs (Re: about violation of standards)

"Manfredi (US), Albert E" <albert.e.manfredi@boeing.com> Fri, 26 April 2019 18:48 UTC

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From: "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>, "ipv6@ietf.org" <ipv6@ietf.org>, Ole Troan <otroan@employees.org>
Subject: RE: encoding Subnet ID in link-local addrs (Re: about violation of standards)
Thread-Topic: encoding Subnet ID in link-local addrs (Re: about violation of standards)
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Date: Fri, 26 Apr 2019 18:48:08 +0000
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-----Original Message-----
From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Alexandre Petrescu

> In  my setting, the Subnet ID in the LL address is unique per subnet,
not per host.  There is a subnet formed by the front bumper interface in
the follower car and the rear bumper interface of the lead car.
>
> The Subnet ID in an LL address would be unique per a set of hosts in 
that subnet.

Instead of messing with LL standards, why not use ULAs? For example, the front car determines the 54 random bits in the ULA prefix. Same logic as you are using now, without requiring any DNS, and without violating anything.

> More details about the problem: RFC4291 54 0 bits would refuse to change 
to accomodate this solution's Subnet ID in an LL address; another detail 
is that one particular OS would not allow the manual configuration of an 
LL address setting some of these 54 0 bits.

I would always look for an equally simple solution that doesn’t need to violate standards. It is the path of least resistance.

Alternatively, you can do what MANET does, which is essentially to use IP addresses as flat address space.

Bert

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