27 Feb
2016
27 Feb
'16
10:48 a.m.
If someone announce that network BGP and you announce
it from your main router
would your announcement will be "more dominant" and the network will return to
UCSD back ? if the answer us yes maybe this is the way to stop someone from
hijacking our network
Ronen,
That is what they call AnyCast basically. It's also ok to announce the
same space from different AS's as well. When you have multiple announcements of
the same block. Who ever has the shortest AS path is who you will get routed to
generally. The only way to guarantee a route path win is to announce something
more specific like {44.68.52.0/25, 44.68.52.128/25}, but most carriers will not
accept or announce anything smaller then a /24 so that most likely will not work
in this case. Correct action here is to go down the path to have them withdraw
the announcement or have their carriers block it from them.
Tim Osburn
http://www.m2os.com
W7RSZ / JG1MBR
https://instagram.com/tim.osburn/