Sudo iptables -t nat -A PREROUTING -i enp4s5f1 -m state -state NEW -m statistic -mode nth = sudo iptables -t nat -A PREROUTING -i enp4s5f1 -m state -state NEW -m statistic -mode nth Sudo iptables -t nat -A PREROUTING -i enp4s5f0 -to-destination 192.168.2.30 Sudo iptables -t nat -A PREROUTING -i enp4s5f0 -m state -state NEW -m statistic -mode nth Restart network manager: sudo systemctl restart rviceĪdd iptable rules: sudo iptables -t nat -A PREROUTING -i enp4s5f0 -m state -state NEW -m statistic -mode nth Post-up ip route add default via 192.168.10.1 dev enp4s5f1 table rt2 Sudo cp /etc/network/interfaces /etc/network/interfaces.bkup: iface enp4s5f1 inet static Second NIC, but ofcourse make a copy of the old one, Sudo iptables -t nat -A POSTROUTING -o ens2 -j MASQUERADEĮdit the /etc/network/interfaces file and add the configuration for the Sudo iptables -t nat -A PREROUTING -i enp4s5f0 -p tcp -dport 80 -j DNAT -to-destination 192.168.2.90 Restore: sudo iptables-restore > /etc/iproute2/rt_tables'Įnable ipv4 forwarding sudo sysctl _forward=1Īdd filter that allows "masquwerading" sudo iptables -t nat -A PREROUTING -i enp4s5f1 -p tcp -dport 80 -j DNAT -to-destination 192.168.2.90 Install the iptables persistent package sudo apt-get install iptables-persistentīackup your existing iptables rules: sudo iptables-save > ~/iptables-export WARNING: READ THROUGH FIRST BEFORE EXECUTING DISCLAIMER: Untested $IPT -A FORWARD -j LOG -m limit -limit 10/minute -limit-burst 1 -log-prefix "Blocked:" $IPT -A FORWARD -d 8.8.8.8 -p tcp -m multiport -dports 53 -j ACCEPT $IPT -A FORWARD -i $NIC2 -o $LAN -j ACCEPT $IPT -A FORWARD -i $NIC1 -o $LAN -j ACCEPT $IPT -t nat -A PREROUTING -i NIC2 -p tcp -dport 80\ $IPT -t nat -A PREROUTING -i NIC1 -p tcp -dport 80\ $IPT -A FORWARD -m state -state RELATED,ESTABLISHED -j ACCEPT $IPT -A FORWARD -m state -state INVALID -j DROP $IPT -A INPUT -p tcp -m tcp -dport 80 -j ACCEPT $IPT -A INPUT -p tcp -m tcp -dport 22 -j ACCEPT $IPT -A INPUT -m state -state RELATED,ESTABLISHED -j ACCEPT $IPT -A INPUT -m state -state INVALID -j DROP # erase all chains that's not default in filter and nat table. # flush all the rules in the filter and nat tables. # reset the default policies in the mangle table. # reset the default policies in the nat table. # reset the default policies in the filter table. Hope someone out there will help me, which is very much appreciated. Is it possible to split the two isps, i.e, for systems 1 to 5 (ISP1) and 5 to 10 (ISP2) using routing tables? We would like to optimally use the incoming internet in LAN using Round-Robin method This code was assembled by looking at many websites on the topic. As I am a noob, my crude attempt is given in the following code, obviously without success. I want to balance the load to ISPs using ip tables. NIC1 and NIC2 are used for internet connections
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