wiki:Policies
Last modified 3 months ago

Policies

These are Routing-Policies, there are no real Usage Policy.

Routing

AS Number

You can use your own RIPE AS # or a private one, which is 64600+n, where n is 172.22.n.0/25.
Don't use public AS # which are not yours!
ICANN IS qualified to decide which ASNs belong to whom!

Transit AS

Prepend your one AS one time if you participate from an DSL and an other time if you have less than a 10 mbit/s full-duplex connection.

Assuming you have all your dn42 peers in one group this can be implemented with OpenBGPd by appending this to your bgpd.conf:
match to group "DN42" set prepend-self 2
Read man 5 bgpd.conf vor details.

The quagga command is: set as-path prepend 9578 9578 (while 9578 is your own AS)

Subnet sizes

  • Networks smaller than /28 are being filtered by some people, /28 is meant to be the "smallest safe net size"
    • You may choose to use smaller subnets nevertheless. But please round up to /28 in your BGP configuration.
  • Host routes are being filtered. See above.

It is reasonable to use smaller subnets for yourself. You'll be having free addresses when you add more subnets.

IPv4 routes

  • 172.22.0.0/15 is the the dn42 range. All people should accept these routes. We don't want to think about intended collisions...
    • 172.23.0.0/16 isn't in use currently and for the foreseeable future. This is reserve.
  • Foreign  RFC1918 networks:
    • 192.168.x.0/24 where x = {0, 1, 2, 10, 100, 200, 254} is not welcome, collides with any ADSL/cable modem, home networks, default settings and causes disputes
    • 10.10.10.0/24 is being blocked by at least one user, ISP Kabel Deutschland has their DHCP servers there
    • Everything else depends on a peer's individual filters
    • Because of Freifunk peerings, keep your net out of 10.0.0.0/8 to avoid collisions
  • Foreign global-scoped networks:
    • Please announce in this Wiki to allow people update their filter lists

At all anyone may announce whatever he wishes to. It always depends on a peer's filters.

IPv6 routes

The Ranges mentioned in Topology are being used. Everything else may be filtered. It always depends on a peer's filters.

MTU

The smalles "regular" MTU is 1460, a "safe reserve" from some years ago. Also usual are 1472 (DSL - GRE) and 1476 (Ethernet - GRE). Some routers (OpenVPN) fragment automagically.

Firewalling

You MUST NOT filter routed traffic!

Whoever filters shall not announce routes.