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IPSec connection from behind NAT
# 10.0.0.21 is the "public" IP address - local is 10.40.180.50 (DHCP)
ike esp from 10.0.0.21 to 10.0.0.23
# 10.255.255.253 is the IP on this side of a gif(4) tunnel, the other is the other side
ike esp from 10.255.255.253 to 10.255.255.252 peer 10.0.0.23
# ifconfig output at https://pasteboard.co/HT0kGu7.png
# tcpdump output at https://pasteboard.co/HT0m2JA.png
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