Will this rules make kernel to see the same packet at least twice?
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
Found the stuff in a forgotten config file. A remark about option "-d 0/0" was also there, did this option makes sense when certain log targets are used in iptables - to avoid incorrect traffic calculation?