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NTA 3.5 how netflow works? Sanity check

Just wondering if someone can clear this up for me......

 

When configuring netflow between my router and server.  Does the server pull the netflow data or does the router pushes it from port 2055. 

 

This may seem to be a stupid question.  The reason im asking because my server is behind my firewall and im monitoring a router on the outside interface of my firewall.  I havent made any rule to allow the port udp 2055 to go through the firewall so i assumed the server polls the router.

 

thanks