Flying racoons – typo?

Hi there. Just trying to mimic the setup from part 3, and wondering what the numbers from the following lines:

spdadd 192.168.0.0/24 10.0.1.2/32 any -P in ipsec esp/tunnel/17.254.0.91.154-10.0.1.2/require;
spdadd 10.0.1.2/32 192.168.0.0/24 any -P out ipsec esp/tunnel/10.0.1.2-68.17.254.0.91/require;

• specifically, the 154 at the end of the “in” line and the 68 at the end of the “out” line – what are these for? From the examples via “man spdadd”, I wonder if they’re typos? Or perhaps I don’t fully understand the syntax (pretty likely.. 😯 )

ScottC