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What is the purpose of dmz_cidr?

Looking at the source, all it does is add an iptable rule like

-A nova-network-POSTROUTING -s 10.0.0.0/24 -d 172.18.0.131/32 -j ACCEPT

I am not fluent in iptable and could not find anything about this with a web search. Is there an easy explanation of when and why you would want to set this flag?