linux-kernel - Re: IPv4 NAT UDP Traversal issue

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Message-ID: <j2ocfeab66d1004192002z8fd0b6acx52da44ca3210dc5f@mail.gmail.com>
Date:	Tue, 20 Apr 2010 08:32:02 +0530
From:	ratheesh k <ratheesh.ksz@...il.com>
To:	飞颜 <win847@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: IPv4 NAT UDP Traversal issue

2010/4/20 飞颜 <win847@...il.com>:
> Dear all,
>
>       I have a question about Linux NAT, our Product is ADSL
> Router(Linux Version is 2.6.22.15), and Now our customers requirment
> is below:
>
>       IPv4 Nat: UDP Traversal through NAT, must support STUN
> (RFC3489)  the four ways: Full Cone、Restricted Cone、Port Restricted
> Cone and Symmetric
>
>       As I known, netfilter IPv4 NAT is belonged to Symmetric type.
> and if want UDP Traversal through NAT, NAT Device can not be Port
> Restricted Cone and Symmetric type if the other is Symmetric type.
>
>       So my question is: Can iptable set the UDP NAT converted to
> Full Cone or Restricted Cone type?
>
>       we now set NAT use iptables below：
>
> Chain POSTROUTING (policy ACCEPT)
> target     prot opt source               destination
> MASQUERADE  all  --  anywhere             anywhere
>
>       Thanks very much!
>
> BR,
> win847
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