In linii mari:

1. marchezi pachetele in firewall-ul tau
/sbin/iptables -t mangle -A FORWARD -s 192.168.1.0/24 -j MARK --set-mark 0x89
/sbin/iptables -t mangle -A POSTROUTING -s ! 192.168.1.0/24 -d 192.168.1.0/24 -j MARK 
--set-mark 0x89

2. faci un script care afiseaza valorile de trafic
/sbin/iptables -t mangle -L -vnx | grep 0x89 | tr -s " " | cut -f3 -d" "

Vrei detalii?
http://www.netfilter.org/documentation/



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