nnchnroutes - Non Non China Routes

This is a modified version of dndx/nchnroutes to adapt the reversed needs.

The original nchnroutes

The original nchnroutes was designed to pull IP addresses (blocks) of which stated themselves as 'CN' from this APNIC list. The APNIC list might not be conclusive because it was not based on BGP announcements. The other list, 17mon/china_ip_list, literally, containing China IP addresses and updates seasonally, might provide more precise information since this list was mainly generated based on BGP announcements. nchnroutes then integrates the data and subtracts them from the IANA IPv4 Address Space Registry, resulting in a list containing all non-China IP addresses (blocks). Eventually nchnroutes generates routes4.conf and routes6.conf in BIRD static route format, and thus these files can be used in some cases, for example, pushing routes via OSPF.

nnchnroutes?

In some cases, you want the reverse - for example, you might want to route China IP addresses through a specific (and pricy) transit that somehow routes China IP addresses better than your regular favorite transit. This project is designed to adapt to the reversed needs. The fundamentals of nnchnroutes are identical to nchnroutes, but one does addition and the other one does subtraction.

Usage

The program only had few modification from nnchnroutes, so the following was borrowed from the original.

$ python3 produce.py -h

usage: produce.py [-h] [--include [CIDR [CIDR ...]]] [--next INTERFACE OR IP]
                  [--ipv4-list [{apnic,ipip} [{apnic,ipip} ...]]]

Generate China routes for BIRD.

optional arguments:
  -h, --help            show this help message and exit
  --include [CIDR [CIDR ...]]
                        IPv4 ranges to include in CIDR format
  --next INTERFACE OR IP
                        next hop for China IP addresses.
                        might be your transit address, might be your tunnel address.
  --ipv4-list [{apnic,ipip} [{apnic,ipip} ...]]
                        IPv4 lists to use when fetching China-based IP addresses,
                        multiple lists can be used at the same time (default:
                        apnic ipip)

To specify China IPv4 address list to use, use the --ipv4-list as the following:

• python3 produce.py --ipv4-list ipip - only use 17mon/china_ip_list.
• python3 produce.py --ipv4-list apnic - only use the APNIC list
• python3 produce.py --ipv4-list apnic ipip - use both (default)

It is also possible to use crontab to generate routes4.conf and routes6.conf in certain time frequency.