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The problem is the sequence that is not correct. If you use the iptables command with -A switch, the rule is appended to the POSTROUTING chain. You should use the -I switch instead with which you can specify the position where to insert the rule. In other words try to replace
iptables -t nat -A POSTROUTING –source 192.168.0.2 -j SNAT –to-source x.x.x.2
iptables -t nat -I POSTROUTING 2 –source 192.168.0.2 -j SNAT –to-source x.x.x.2