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Problem DNAT using ppp0 ADSL

I am having problems to use DNAT in one gateway with external interface ppp0 and internal interface eth1 Already I placed MTU low 890 of eth0 very; but ppp0 only connects with MTU 1492 would like to reduce this MTU, therefore when I use the rule:
iptables -A FORWARD -p tcp -m tcp --tcp-flags \
SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu


iptables -t nat -I PREROUTING -p tcp --dport 3389 \
-j DNAT --to

it does not function!

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