ROUTE + SNAT Problem

[tonton19 <tonton19@voila.fr>]

I've got a very strange problem using ROUTE and SNAT targets.
First, I type these two rules : 
# iptables -t nat -A PREROUTING -d 20.1.0.1 -p tcp --dport 80 -j DNAT --to-destination 173.20.0.210
# iptables -t nat -A POSTROUTING -d 173.20.0.210 -p tcp --dport 80 -j SNAT --to-source 20.1.0.2

everything works, all is ok, each packet which matches with the first rule, matches with the second too. But, when I declare the following rule :
# iptables -t mangle -A POSTROUTING -d 173.20.0.210 -p tcp --dport 80 -j ROUTE --oif eth0
the second rule (with SNAT target) no longer works !!! I can see with iptables -t nat --list --verbose that no packet match with the second rule. In the other hand the third rules (with ROUTE target) works well. So, please help me ! Wat's the problem ? Is there an incompatibility beetween ROUTE and SNAT targets ? or my rules are not good ?
Thank you for your help
Gwen

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