Nginx servers on both *:80 and <ip>:80? also duplicate listen parameters error when binding by just specific ips

[CJ Ess]

I would like to have an Nginx setup where I have specific logic depending
on which interface (ip) the request arrived on.

I was able to make this work by having a server stanza for each ip on the
server, but was't able to do a combination of a specific ip and a wildcard
ip (as a catchall) - is there a way to do that with some option combination
(i.e. nginx listens on *:80, but matches the server stanza by ip?)

The scenario I'm playing towards is that I have a dedicated connection to a
CDN and I want to pass thru certain headers if they arrive via the
dedicated interface, strip them if they arrive on other interface.

When I did the server{} per IP approach nginx complained about duplicate
listen settings for the second IP even though both server stanzas were
bound to a specific port/interface. Is this a bug per chance?

This was with Nginx 1.9.0 btw, perhaps newer versions have a different
behavior?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.nginx.org/pipermail/nginx/attachments/20160331/e5ecbf4d/attachment.html>