Is it possible in POSTROUTING as source to specify a chain:
f.e.
iptables -N LOCAL_NET iptables -A INPUT -i eth1 -s 10.0.0.9 -j LOCAL_NET
iptables -t nat -A POSTROUTING -o eth0 -s LOCAL_NET -j SNAT --to ip.ad.re.ss
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-[capsx]-
iptables -N LOCAL_NET iptables -A INPUT -i eth1 -s 10.0.0.9 -j LOCAL_NET