nat - Trigger iptables masquerade before reaching service on gateway?

I have a STUN service running on the same machine that is
the gateway for the LAN, I would like the results from the STUN service be the same for
both internal and external machines. Currently since the masquerading is done in the
postrouting rule when the packets leave the gateway the STUN server will just see the
LAN IP/port instead of the natted
ip/port.


eth1 (lan):
            10.0.0.1/32
eth0 (wan): 1.2.3.4/31
iptables -A POSTROUTING -t nat -o
            eth0 -j MASQUERADE 

iptables -A INPUT -p udp -d 1.2.3.4/31 --dport
            3701 -j ACCEPT

When a LAN machine
with IP 10.0.0.2 contacts the STUN service at 1.2.3.4 the packets get through but the
STUN service see that the packet gets sent from
10.0.0.2.

How can I get the NAT translation to
occur before the packet arrive to the STUN service and that the response back from the
STUN service won't be from 10.0.0.1 but rather the 1.2.3.4 used when contacting the
service?

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