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

[ronan lopes <lopesronan@yahoo.com.br>]

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


and 


iptables -t nat -I PREROUTING -p tcp --dport 3389 \
-j DNAT --to 10.0.0.7


    it does not function!

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