question about NAT rule

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Hi,

I have the following NAT rule set up :

udp      17 12 src=192.168.1.102 dst=192.168.1.140 sport=7390
dport=8000 packets=6 bytes=3258 [UNREPLIED] src=192.168.1.140
dst=192.168.1.102 sport=10000 dport=9000 packets=0 bytes=0 mark=0
secmark=0 use=2


What I am expecting to achieve is that when udp packets go from
192.168.1.102:7390 to 192.168.1.140:8000, the conntrack module would
redirect the packet to 192.168.1.102:9000, but it is not happening.

Does anyone know what is wrong?

>From wireshark, I am seeing

100	11.732246	192.168.1.140	192.168.1.102	ICMP	Destination unreachable
(Port unreachable)


Any help will be greatly appreciated.

Thanks,
P
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