real broadcast mode

[Tapio Haapala]

Hello,

Bird supports with ospf type broadcast. Looks that it actually means hat 
you execpt from "type mcast".
On several networks multicast is broken. Yes it is broken and we cannot 
do nothing for that because they are metro ethernet and odsl (operator 
dsl) networks and they are leased from local operators.
One solution is make mtmp configuration but if you have 100 router it is 
nightmare.

So I humbly asking new feature. It is real broadcast type. Because of 
compatibility reasons it is unpossible use type bcast for that and 
rename multicast for type mcast I suggest that new type is rbcast. It is 
extension over rfc but it is really usefull one. On real broadcast 
packets send to 255.255.255.255 so they does not get meshed up with 
multicast specific rules.

I have hear many times "but multicast is broadcast on l2 networks". 
Pleas dont use that argument. Truck is car, pickup is car but it does 
not mean that truck is pickup. Some times you have roads where you can 
drive with pickups but not with trucks. First time when I face this 
problem I was thiking that "ok this is corner case and solution is 
ptmp". When we start get these cases on several networks with several 
operators and several vendors, I start thinking that maybe there is 
improvement need on ospf.

ps
How many elese had suffer problems with metro ethernet or dsl network 
that devices delivery unicast traffic and bcast traffic to 
ff:ff:ff:ff:ff:ff but does not delivery traffic to 01:00:5e:00:00:05

-- 
F-Solutions Oy

Tapio Haapala

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