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forwarding udp usint the Debian ipmasq package

Hi.  I'm trying to forward UDP ports to a computer running on my local
network from the internet.  I'm using the ipmasq package in Debian to
masquerade my local network.  Last year I was able to forward ports
4074-4076 and 2074-2076 with the following rules.

iptables -A PREROUTING -t nat -p udp -d public_ip --dport 4074:4076 -j
DNAT --to local_ip
iptables -A PREROUTING -t nat -p udp -d public_ip --dport 2074:2076 -j
DNAT --to local_ip

I stopped doing it for a while because I was running the app that used
these ports on the box that was the gateway for the network.  When I
tried to use the rules again, they no longer work.  I get the following
message in my logs

IN=eth0 OUT=eth1 SRC= DST=local_ip LEN=96 TOS=0x00
PREC=0xA0 TTL=47 ID=0 DF PROTO=UDP SPT=2074 DPT=2075 LEN=76

Public_ip is my IP address on the internet (the IP of eth0) Local_ip is
the address of the system on my local network.  The IP address in the
error is the IP of the system I'm trying to reach.  Eth1 is connected to
my local network.
Basically, I'm trying to use a speak_freely reflector running on the IP
address in the error.
Does anyone have an idea what other rules I need to get this working

Thanks in advance for any help.

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