as in:

  find_connection: looking for policy for connection: 192.0.3.254:1/8
-> 192.0.2.254:1/0

perhaps this helps (or confuses)?

  subnet from endpoint 192.0.3.254:8 (in netlink_acquire() at
kernel_netlink.c:1782)
  add bare shunt 0x7f943c3fdf78 192.0.3.254/32:8 --1-->
192.0.2.254/32:0 => %hold 0    %acquire-netlink

since this is happening when an acquire is triggered by a ping packet,
 1 is maybe ICMP and 8 is something found in the acquire's .sport
field (but what?)

Two problems:

- the syntax is terrible: :1 isn't a port, /8 isn't a mask - even
192.0.3.254:(1/8) would be better
- there's a subnet kicking round with a bogus port 8, does it get
scrubbed, or do we get away with this because the IKEv2 TS code is
instead looking at end.port and that's zero ...
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