25 Apr
2014
25 Apr
'14
7:37 p.m.
On Fri, Apr 25, 2014 at 8:29 PM, YT9TP - Pedja <yt9tp(a)uzice.net> wrote:
I am not much knowledgeable about BGP. Is it possible
to assign whole 44/8
to one ASN and then advertize subnets with their own gateways using that one
ASN? I mean, like ASN is assigned with number of smaller IP networks.
This is already happening:
44/8 gets announced by UCSD
then there are a few smaller networks that get announced.
Like 44.144/16 in Belgium, 44.140/16 in Sweden, a 44.x /16 in italy,
and a few /24's of individual hams here and there who probably have
BGP at their work.
Routing will always prefer the smaller subnet, meaning that traffic
for 44.144 will be send to the BGP gateway in belgium while the USCD
gateway also covers this network with 44/8
If someone starts announcing eg 44.144.124.0/24 on another BGP
gateway, the traffic will go to that gateway even though there is also
a 44.144/16 gateway and a 44/8 gateway.
73s
Robbie
ON4SAX