On 27 aug 2008, at 7:58, Paul Wall wrote:
- single loopback/single IP for all peers, or;
- each peer with its own loopback/IP?
You should use caution when using loopback IP addresses and building
external multihop BGP sessions. By permitting external devices to
transmit packets to your loopback(s), you open the door to
spoof/denial of service attacks.
[...]
Indeed. I would use two loopbacks, one for internal stuff that is
unreachable from the outside, another one from another range that
allows the external sessions.
But that's more a question of ease of management than of risk, because
if people can do something bad using one loopback address, it really
doesn't matter much that additional ones are better protected.
