Hi authors,

Thanks for the document. I learned a lot while reading it.
I have following questions/comments:


1.       Section 1: What is PBX?


2.       Section 3.3: What are network conditions exactly? RTT or bandwidth? 
Anycast only takes the network proximity into account, not network conditions. 
And another problem of the anycast is that it is not stable. BGP flop will 
route the packet from the same flow to different sites, breaking the connection 
since new site does not have the necessary state.



3.       Section 3.5: "An organization's globally unique DNS can

   include subdomains that cannot be resolved outside certain

   restricted paths, zones that resolve differently based on the origin

   of the query, and zones that resolve the same globally for all

   queries from any source.
Are you referring to the split horizon DNS in 
draft-ietf-add-split-horizon-authority-04 - Establishing Local DNS Authority in 
Validated Split-Horizon 
Environments<https://datatracker.ietf.org/doc/draft-ietf-add-split-horizon-authority/>?
 If so, it is better to add the reference.


4.       Section 4.3: Note that the RFC 6040 is about to be updated by 
draft-ietf-tsvwg-rfc6040update-shim-17 - Propagating Explicit Congestion 
Notification Across IP Tunnel Headers Separated by a 
Shim<https://datatracker.ietf.org/doc/draft-ietf-tsvwg-rfc6040update-shim/>.

Thanks,
Hang
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