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.
Adi
Because you are advertising a route to your subnet via
BGP,
packets addressed to that subnet will go to you directly and
will not reach the gateway at UCSD, and so therefore cannot
reach you over a tunnel.
- Brian