Take away notes from RFC5549 video by AMX-IX

• https://www.youtube.com/watch?v=uJOtfiHDCMw
• AMS-IX running out /22 ipv4 NH address space
• Solution #1: more address space:
• ARP broadcast too much
• Solution #2: private address by RFC1918, 10/8, 172.16/12, 192.168/16
• Space used by ISP customer
• More specific in IGP
• Break traceroute
• Solution #5: RFC5549
• IPv4 NLRI over IPv6 NH
• 2 ways to implement it:
• v4 in v6 tunnel, add 40B head
• direct forwarding - just replace the MAC, no change;