[Info-vax] Facebook service outage

[Scott Dorsey]

On 10/4/2021 6:04 PM, Dave Froble wrote:
> 
> For those who don't get out much, how about explaining what "BGP routing 
> announcements" are.
> 
> I could try looking it up, but, you used it, so you explain what it is ...

If you are old you remember when there were all kinds of different ways
that backbone sites used to decide where to route packets too.  RIP, GGP,
EGP, there were a bunch of different ways to decide what the "best" path
from here to there is.

That's all gone now.  There is one way to transfer routing data around,
and it is BGP.  There is no more picking up the phone and calling up
up Jon Postel to ask if he thought it was better to route through here
or there.  There are no more static routing tables that need manual updating
at inopportune moments.  BGP just works, and it works well when it's fed good
data.

Unfortunately BGP was designed in an era when ISPs could trust one another,
and that's not really the case any more.  It is possible to publish bad
routing data for sites you don't like and get other sites to accept them.
--scott
-- 
"C'est un Nagra. C'est suisse, et tres, tres precis."