On Wed, Jun 15, 2016 at 09:53:39AM +0200, Pierre-Philippe F4MZI wrote:
Minimum netmask size for BGP is /24.
Correct. The operators of the networks which make up the Internet backbone have chosen not to accept BGP advertisements that are narrower than a /24, possibly to minimize the number of entries in the global routing table, so if you choose DIRECT (BGP) as your subnet connection method, the portal adjusts your netmask up to a /24 if you have chosen something smaller.
Note that to have a BGP-advertised subnet, you must have arranged with your Network Service Provider that they will in fact supply you with a connection based on their advertising your subnet to the Internet backbone as being CIDR-routed. It is unusual for NSPs to do this; many won't and others charge a significant amount for the service. You should NOT select Direct in a portal allocation request unless you have arranged for this service from your NSP.
In any case, your subnet will be connected to the Internet by at most ONE method: Radio, Tunnel, or Direct, and might not be connected at all, so select at most ONE of the connection method boxes in the allocation request. (I have asked that these selections be changed to a pulldown list or radio buttons so that it is impossible to select more than one; until that happens, requests having more than one box checked are likely to be rejected.) - Brian