Re: [babel] Restarting nodes and seqno requests

[Juliusz Chroboczek <[e-mail]>]

>> - add an option for picking a different router-id each time (but
>> don't make it the default, since it makes management more difficult
>> without stable router-ids);

> Hmm, actually, since Bird sets its router ID from an IPv4 address,

What if there's no IPv4 address?  What if two IPv6 routers have the same
IPv4 address (because they're in different NAT domains)?  (FYI, babeld
uses the first MAC address if finds that has the local bit unset, and
falls back to random if no such address is found.)

> My implementation of the randomisation only randomises the top 32 bits,
> so there's still a stable identifier. Maybe it would make sense to
> default to this behaviour?

That would break the optimisation of using the low bits of the IPv6
address to encode the router-id.  Probably not a big deal, except in pure
mesh networks.

I'm not sure how you'd avoid router-id collisions, though.

>> - bug the BIRD guys about implementing persistent storage; two octets is
>>   all we're asking for.

> Yeah, 16 bits should be enough for everyone, right? ;)

You could always encode it in JSON if you want to use more space.

>> Should I document the issue in 6126bis?  I'll definitely add a paragraph
>> in applicability-statement.

> Hmm, documenting it *somewhere* is needed, certainly. Maybe putting it
> into 6126bis is a good idea,

Yeah.  I'll try to find some time to make a new revision tomorrow, if
you'd like to send me a patch, I'd be grateful.  (No promise to keep your
wording, though.)

-- Juliusz