On May 26, 2020, at 3:52 PM, Sander Steffann 
<san...@steffann.nl<mailto:san...@steffann.nl>> wrote:

Source and destination are in the same domain. Who says that the domain is 
contiguous? Let's change the example to main and branch offices. Same 
administrative domain, while still traversing the internet.

This is an interesting point. You can protect it with AH to address security 
concerns about sending the CRH across the big-I Internet, too. I feel like it 
provides another illustration of the “look at the benefits you get if you work 
within an existing architecture instead of trying to invent a whole new one” 
case. You didn’t have to invent a whole new security architecture of your own — 
you fit into an existing architecture, and got to inherit its security 
properties.

$0.02,

—John
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