Re: [44net] BGPed Gateway - 44net

22 Jan 2017

...
  With the BGP advertisement my subnet is reachable via
internet and can reach anywhere via internet.  Other 44 networks can reach my subnet as
long as they are also advertised via BGP or have appropriate NAT rules to allow internet
access.  I can reach any BGP advertised 44 net addresses.  However, I should not be able
to reach any non-BGP advertised 44 net addresses unless there is a gateway (at USCD?) that
allows for access to IPIP only 44 networks from 44 networks. 
...
  I guess I don’t know the network topology of the 44
net or the functions that are provided at the UCSD gateway. 
...
  I assumed that in order to reach IPIP only networks I
would have to also establish IPIP tunnelling from each 44 host or gateway using subnets of
my BGP advertised subnet. 
When the system that handles the traffic that comes in on your BGP advertised route also
has a public IP address and is made member of the IPIP mesh for the same subnet it
advertises on BGP, you can talk to everyone that is on the IPIP mesh.
They will send traffic for you via the IPIP tunnel that they establish because you are in
the list maintained via portal.ampr.org and transmitted using RIP from the gateway at
UCSD.
You then only use IPIP for traffic between hosts on the IPIP mesh, not for the remainder
of traffic to and from internet.

Rob