Introduction
Our Network
Peering Policy
Peering Agreement
Peering Locations
Routing Policy
Route Filtering
Packet Filtering
BGP Communities
Network Utilization
Tools

Route Filtering

AS6667 filters routes considered harmful at the border. These can be of the following types:

  • Our own IP blocks
  • IANA reserved IP blocks
  • Prefixes longer than /24 (netmask 255.255.255.0)
  • Prefixes longer than /22 (netmask 255.255.248.0)

We will never accept prefixes more specific than /24. We will always accept /24 routes within The Swamp (192.0.0.0/7). Outside that range the default filter will get rid of prefixes longer than /22.

If a peer's routes are otherwise well behaved, but they have a few legitimate routes that would get caught by the default filter, we will use a more lenient filter. Should we ever give a peer subnets from our own CIDR allocations (such as if a customer with a large continuous chunk of address space moved to another provider), there's also a filter that lets almost anything through.