How does it work?

There are two route servers at each Exchange which hold details of the routes exchanged at that Exchange. These servers filter routes in two ways:

1. Incoming announcements are checked against individual filter lists for each peer.
   
2. Outgoing announcements are filtered to make sure that routes are not announced for RFC1918 addresses and other bogon or martian addresses.

The filter lists and other details of the route server configuration are built automatically from an RPSL database using the RtConfig tool from the IRRToolset. If you need to change the prefixes you want to announce, each Exchange has a web page where you can do this:

• Change APE routes
  
• Change HIX routes
  
• Change DPE routes
  
• Change PNIX routes
  
• Change WIX routes
  
• Change WIX6 routes
  
• Change 3CIX routes
  
• Change CHIX routes
  
• Change SIX routes

More information on using RPSL is available from the APNIC page About the APNIC Routing Registry. For a number of reasons we run our own Routing Registry Database at present. The New Zealand Routing Registry data is available either by using a standard whois client connected to:

• whois.nzix.net:43

or using a web based interface:

• NZRR Routing Registry Database

For example, you can examine the WIX routing policy by looking up the details for AS9439

A list of the Autonomous Systems connected to the WIX route servers are given in the RPSL as-set objects AS9439:AS-PRIVATE and AS9439:AS-PUBLIC. The AS numbers in the private list have been assigned by CityLink for use on the PNIX only. The AS numbers in the public list have been assigned by one of the Regional Internet Registries such as APNIC.

Each AS has a list of networks they announce to the route servers given in an RPSL route-set object. For example, the numbers that CityLink announce to the WIX are given by AS9439:RS-ROUTES:AS23754 and incoming announcements are checked against filters constructed from these lists.

Each WIX peer can check the list of networks that they are allowed to announce to the WIX by looking up the relevant route-set AS9439:RS-ROUTES:AS<YOUR_AS>. Please get in touch with us with any corrections.

The list of exported routes is checked against an RPSL filter-set called fltr-bogons which is constructed from two other filter-sets fltr-martian and fltr-unallocated Thanks to Rob Thomas at Team Cymru for these filters.