nog.fi meeting 2023.11

IPv4 addresses are getting expensive — to the point that you may not "throw it away" for infrastructure links that don't need them.

This presentation talkes a hands-on walk through the multiple ways of getting IPv4 routing without IPv4 addresses on router-to-router links:

• a short look at "historic" unnumbered serial PtP links
• classic IPv4-only unnumbered setups
• modern IPv4 with IPv6 nexthops (RFCs 5549/8950)
• known caveats, in particular while troubleshooting any of these setups

We'll be using FRRouting on Linux for configuration examples and demos, but everything is transferrable to other vendors (support for these setups is pretty common these days.)