types of NAT with netfilter

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Hi ,

 I have a linux router with  only one rule

  iptables -t nat -A POSTROUTING -i eth0 -o eth1 -j MASQUERADE


 What i understood is (by googling net ) is that  adding this will
give symmetric nat support to my router , is it true  ???.



 1. To have  " full cone nat" support  what should i do ??  Is it same
as DMZ configuration ??

 2 . restricted nat and port restricted nat cannot be implemented
using iptables ???

 3 . i installed windows STUC and tested . Test results show it is a
portrestricted nat ... But if i make default policy for wan INPUT and
wan PREROUING as REJECT , test  got failed ??? is it iptables
dependend ??

Thanks,
Ratheesh
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