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DNAT + ADSL... to reduce MTU of the network

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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