25 May
2017
25 May
'17
11:52 p.m.
Brian at al,
Thinking about this, I recall that I run an IPv6 tunnel with Hurricane Electric in the same manner. They require that I allow ICMP - Echo Request to the border. The tunnel doesn't come online at their end, until they receive an Echo Reply from the IP I specified (either statically or with DDNS).
Just a rule used by one ISP.
- Lynwood