iptables PortForward not working properlyIptables working strangelysquid + iptables not workingConnecting Two Computers Together: Assigning IP doesnt workRouting and Ip setupForwarding ports with iptables not working?IP tables as a basic proxy not functioning as expectedUbuntu 16.04 lts - network does not start on boot - bondingIPtables logging not working

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iptables PortForward not working properly


Iptables working strangelysquid + iptables not workingConnecting Two Computers Together: Assigning IP doesnt workRouting and Ip setupForwarding ports with iptables not working?IP tables as a basic proxy not functioning as expectedUbuntu 16.04 lts - network does not start on boot - bondingIPtables logging not working






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;









0

















4 ISPs are connected to the gateway, I tried using iptables for load balancing, but only one ISP is utilized for connecting to internet while the rest of the ISPs are idle as is evident from the output of ifstat.



Kindly go through the script and advise suitably.
Your help is much appreciated.



# /etc/network/interfaces
auto lo
iface lo inet loopback

auto enp4s5f0
iface enp4s5f0 inet static
address 192.168.7.2
netmask 255.255.255.0
gateway 192.168.7.1
dns-nameservers 8.8.8.8 8.8.4.4

auto enp4s5f1
iface enp4s5f1 inet static
address 192.168.8.2
netmask 255.255.255.0
gateway 192.168.8.1
dns-nameservers 8.8.8.8 8.8.4.4

auto enp4s6f0
iface enp4s6f0 inet static
address 192.168.9.2
netmask 255.255.255.0
gateway 192.168.9.1
dns-nameservers 8.8.8.8 8.8.4.4

auto enp4s6f1
iface enp4s6f1 inet static
address 192.168.10.2
netmask 255.255.255.0
gateway 192.168.10.1
dns-nameservers 8.8.8.8 8.8.4.4

auto ens2
iface ens2 inet static
address 192.168.2.190
netmask 255.255.255.0
#gateway 192.168.2.1
dns-nameservers 8.8.8.8 8.8.4.4


#

ipt.sh 



#!/bin/bash
set -x
IPT="/sbin/iptables"
NIC1="enp4s5f0"
NIC2="enp4s5f1"
NIC3="enp4s6f0"
NIC4="enp4s6f1"
LAN="ens2" 
ISP1="192.168.7.33"
ISP2="192.168.8.33"
ISP3="192.168.9.33"
ISP4="192.168.10.33"
IIP="192.168.2.190"
echo 1 >| /proc/sys/net/ipv4/ip_forward
echo 0 >| /proc/sys/net/ipv4/conf/all/rp_filter

#***************
# reset iptables
#_______________
## reset the default policies in the filter table.
$IPT -P INPUT ACCEPT
$IPT -P FORWARD ACCEPT
$IPT -P OUTPUT ACCEPT

## reset the default policies in the nat table.
$IPT -t nat -P PREROUTING ACCEPT
$IPT -t nat -P POSTROUTING ACCEPT
$IPT -t nat -P OUTPUT ACCEPT

## reset the default policies in the mangle table.
$IPT -t mangle -P PREROUTING ACCEPT
$IPT -t mangle -P OUTPUT ACCEPT

## flush all the rules in the filter and nat tables.
$IPT -F
$IPT -t nat -F
$IPT -t mangle -F

## erase all chains that's not default in filter and nat table.
$IPT -X
$IPT -t nat -X
$IPT -t mangle -X

#****************
# rules 
#________________
$IPT -A INPUT -m state --state INVALID -j DROP 
$IPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
$IPT -A INPUT -p icmp -j ACCEPT 
$IPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT 
$IPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT 
$IPT -A INPUT -p tcp -m tcp --dport 8443 -j ACCEPT 

$IPT -A FORWARD -m state --state INVALID -j DROP 
$IPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT 
$IPT -A FORWARD -p icmp -j ACCEPT 
#****************



ip route add default scope global 
 nexthop via $ISP1 dev $NIC1 weight 1 
 nexthop via $ISP2 dev $NIC2 weight 1 
 nexthop via $ISP3 dev $NIC3 weight 1 
 nexthop via $ISP4 dev $NIC4 weight 1 

#iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
#iptables -t mangle -A PREROUTING -m mark ! --mark 0 -j ACCEPT
#iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 10
#iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 20
#iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 30
#iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 40
#iptables -t mangle -A PREROUTING -j CONNMARK --save-mark


$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC1 -j SNAT --to-source $ISP1
$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC2 -j SNAT --to-source $ISP2
$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC3 -j SNAT --to-source $ISP3
$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

#$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

iptables -P FORWARD DROP
#********************************
# allow certain hosts full access
#________________________________

allowHost() 
iptables -A FORWARD -i $LAN -s $1 -j ACCEPT 


ip route flush cache


#

ifstat -bt 
 ens2 enp4s5f0 enp4s5f1 enp4s6f0 enp4s6f1 
 Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out
 1.88 0.00 0.94 0.47 0.00 0.00 0.00 0.00 0.00 0.00
 2.04 0.00 0.70 0.70 0.00 0.00 0.00 0.00 0.00 0.00
 8.09 6.98 1.17 0.70 0.47 0.00 1.40 0.47 0.47 0.00
 1.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 3.14 0.00 0.52 0.52 0.00 0.00 0.00 0.00 0.00 0.00
 3.14 0.00 0.51 0.51 0.00 0.00 0.00 0.00 0.00 0.00
 2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 7.87 4.68 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
 1.78 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 4.66 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
30271.07 915.72 0.00 0.00 0.94 0.47 0.00 0.00 0.00 0.00
 5576.91 566.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 170.83 208.16 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
37166.45 1144.21 56.66 30.21 0.00 0.00 0.00 0.00 0.00 0.00
87935.34 2220.31 36.37 1.54 0.00 0.00 0.00 0.00 0.00 0.00
11944.23 263.43 0.94 0.98 0.00 0.00 0.00 0.00 0.00 0.00
25600.64 564.53 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 3.13 0.00 0.47 0.00 0.00 0.00 1.40 0.47 0.47 0.00
26966.93 609.43 0.47 0.47 0.47 0.00 0.00 0.00 0.00 0.00
 3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 3.13 0.00 0.47 0.00 0.00 0.00 0.47 0.00 0.47 0.00
 4.03 5.73 2.72 2.72 0.47 0.00 0.00 0.00 0.00 0.00
 4.60 0.84 6.53 6.53 0.00 0.00 0.00 0.00 0.00 0.00


#



Network



Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
 IF: ens2 state: up speed: 100 Mbps duplex: full mac: 00:1c:c0:85:7c:43
 Card-2: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
 IF: enp4s5f0 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:25:11:4e
 Card-3: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
 IF: enp4s5f1 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:25:11:4f
 Card-4: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
 IF: enp4s6f0 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:23:02:1a
 Card-5: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
 IF: enp4s6f1 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:23:02:1b





16.04 networking iptables port-forwarding







share|improve this question


































    0

















    4 ISPs are connected to the gateway, I tried using iptables for load balancing, but only one ISP is utilized for connecting to internet while the rest of the ISPs are idle as is evident from the output of ifstat.



    Kindly go through the script and advise suitably.
    Your help is much appreciated.



    # /etc/network/interfaces
    auto lo
    iface lo inet loopback

    auto enp4s5f0
    iface enp4s5f0 inet static
    address 192.168.7.2
    netmask 255.255.255.0
    gateway 192.168.7.1
    dns-nameservers 8.8.8.8 8.8.4.4

    auto enp4s5f1
    iface enp4s5f1 inet static
    address 192.168.8.2
    netmask 255.255.255.0
    gateway 192.168.8.1
    dns-nameservers 8.8.8.8 8.8.4.4

    auto enp4s6f0
    iface enp4s6f0 inet static
    address 192.168.9.2
    netmask 255.255.255.0
    gateway 192.168.9.1
    dns-nameservers 8.8.8.8 8.8.4.4

    auto enp4s6f1
    iface enp4s6f1 inet static
    address 192.168.10.2
    netmask 255.255.255.0
    gateway 192.168.10.1
    dns-nameservers 8.8.8.8 8.8.4.4

    auto ens2
    iface ens2 inet static
    address 192.168.2.190
    netmask 255.255.255.0
    #gateway 192.168.2.1
    dns-nameservers 8.8.8.8 8.8.4.4


    #

    ipt.sh 



    #!/bin/bash
    set -x
    IPT="/sbin/iptables"
    NIC1="enp4s5f0"
    NIC2="enp4s5f1"
    NIC3="enp4s6f0"
    NIC4="enp4s6f1"
    LAN="ens2" 
    ISP1="192.168.7.33"
    ISP2="192.168.8.33"
    ISP3="192.168.9.33"
    ISP4="192.168.10.33"
    IIP="192.168.2.190"
    echo 1 >| /proc/sys/net/ipv4/ip_forward
    echo 0 >| /proc/sys/net/ipv4/conf/all/rp_filter

    #***************
    # reset iptables
    #_______________
    ## reset the default policies in the filter table.
    $IPT -P INPUT ACCEPT
    $IPT -P FORWARD ACCEPT
    $IPT -P OUTPUT ACCEPT

    ## reset the default policies in the nat table.
    $IPT -t nat -P PREROUTING ACCEPT
    $IPT -t nat -P POSTROUTING ACCEPT
    $IPT -t nat -P OUTPUT ACCEPT

    ## reset the default policies in the mangle table.
    $IPT -t mangle -P PREROUTING ACCEPT
    $IPT -t mangle -P OUTPUT ACCEPT

    ## flush all the rules in the filter and nat tables.
    $IPT -F
    $IPT -t nat -F
    $IPT -t mangle -F

    ## erase all chains that's not default in filter and nat table.
    $IPT -X
    $IPT -t nat -X
    $IPT -t mangle -X

    #****************
    # rules 
    #________________
    $IPT -A INPUT -m state --state INVALID -j DROP 
    $IPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
    $IPT -A INPUT -p icmp -j ACCEPT 
    $IPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT 
    $IPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT 
    $IPT -A INPUT -p tcp -m tcp --dport 8443 -j ACCEPT 

    $IPT -A FORWARD -m state --state INVALID -j DROP 
    $IPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT 
    $IPT -A FORWARD -p icmp -j ACCEPT 
    #****************



    ip route add default scope global 
     nexthop via $ISP1 dev $NIC1 weight 1 
     nexthop via $ISP2 dev $NIC2 weight 1 
     nexthop via $ISP3 dev $NIC3 weight 1 
     nexthop via $ISP4 dev $NIC4 weight 1 

    #iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
    #iptables -t mangle -A PREROUTING -m mark ! --mark 0 -j ACCEPT
    #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 10
    #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 20
    #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 30
    #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 40
    #iptables -t mangle -A PREROUTING -j CONNMARK --save-mark


    $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC1 -j SNAT --to-source $ISP1
    $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC2 -j SNAT --to-source $ISP2
    $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC3 -j SNAT --to-source $ISP3
    $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

    #$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

    iptables -P FORWARD DROP
    #********************************
    # allow certain hosts full access
    #________________________________

    allowHost() 
    iptables -A FORWARD -i $LAN -s $1 -j ACCEPT 


    ip route flush cache


    #

    ifstat -bt 
     ens2 enp4s5f0 enp4s5f1 enp4s6f0 enp4s6f1 
     Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out
     1.88 0.00 0.94 0.47 0.00 0.00 0.00 0.00 0.00 0.00
     2.04 0.00 0.70 0.70 0.00 0.00 0.00 0.00 0.00 0.00
     8.09 6.98 1.17 0.70 0.47 0.00 1.40 0.47 0.47 0.00
     1.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     3.14 0.00 0.52 0.52 0.00 0.00 0.00 0.00 0.00 0.00
     3.14 0.00 0.51 0.51 0.00 0.00 0.00 0.00 0.00 0.00
     2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     7.87 4.68 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
     1.78 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     4.66 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
    30271.07 915.72 0.00 0.00 0.94 0.47 0.00 0.00 0.00 0.00
     5576.91 566.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     170.83 208.16 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
    37166.45 1144.21 56.66 30.21 0.00 0.00 0.00 0.00 0.00 0.00
    87935.34 2220.31 36.37 1.54 0.00 0.00 0.00 0.00 0.00 0.00
    11944.23 263.43 0.94 0.98 0.00 0.00 0.00 0.00 0.00 0.00
    25600.64 564.53 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     3.13 0.00 0.47 0.00 0.00 0.00 1.40 0.47 0.47 0.00
    26966.93 609.43 0.47 0.47 0.47 0.00 0.00 0.00 0.00 0.00
     3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
     3.13 0.00 0.47 0.00 0.00 0.00 0.47 0.00 0.47 0.00
     4.03 5.73 2.72 2.72 0.47 0.00 0.00 0.00 0.00 0.00
     4.60 0.84 6.53 6.53 0.00 0.00 0.00 0.00 0.00 0.00


    #



    Network



    Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
     IF: ens2 state: up speed: 100 Mbps duplex: full mac: 00:1c:c0:85:7c:43
     Card-2: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
     IF: enp4s5f0 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:25:11:4e
     Card-3: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
     IF: enp4s5f1 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:25:11:4f
     Card-4: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
     IF: enp4s6f0 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:23:02:1a
     Card-5: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
     IF: enp4s6f1 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:23:02:1b





    16.04 networking iptables port-forwarding







    share|improve this question






























      0












      0








      0








      4 ISPs are connected to the gateway, I tried using iptables for load balancing, but only one ISP is utilized for connecting to internet while the rest of the ISPs are idle as is evident from the output of ifstat.



      Kindly go through the script and advise suitably.
      Your help is much appreciated.



      # /etc/network/interfaces
      auto lo
      iface lo inet loopback

      auto enp4s5f0
      iface enp4s5f0 inet static
      address 192.168.7.2
      netmask 255.255.255.0
      gateway 192.168.7.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto enp4s5f1
      iface enp4s5f1 inet static
      address 192.168.8.2
      netmask 255.255.255.0
      gateway 192.168.8.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto enp4s6f0
      iface enp4s6f0 inet static
      address 192.168.9.2
      netmask 255.255.255.0
      gateway 192.168.9.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto enp4s6f1
      iface enp4s6f1 inet static
      address 192.168.10.2
      netmask 255.255.255.0
      gateway 192.168.10.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto ens2
      iface ens2 inet static
      address 192.168.2.190
      netmask 255.255.255.0
      #gateway 192.168.2.1
      dns-nameservers 8.8.8.8 8.8.4.4


      #

      ipt.sh 



      #!/bin/bash
      set -x
      IPT="/sbin/iptables"
      NIC1="enp4s5f0"
      NIC2="enp4s5f1"
      NIC3="enp4s6f0"
      NIC4="enp4s6f1"
      LAN="ens2" 
      ISP1="192.168.7.33"
      ISP2="192.168.8.33"
      ISP3="192.168.9.33"
      ISP4="192.168.10.33"
      IIP="192.168.2.190"
      echo 1 >| /proc/sys/net/ipv4/ip_forward
      echo 0 >| /proc/sys/net/ipv4/conf/all/rp_filter

      #***************
      # reset iptables
      #_______________
      ## reset the default policies in the filter table.
      $IPT -P INPUT ACCEPT
      $IPT -P FORWARD ACCEPT
      $IPT -P OUTPUT ACCEPT

      ## reset the default policies in the nat table.
      $IPT -t nat -P PREROUTING ACCEPT
      $IPT -t nat -P POSTROUTING ACCEPT
      $IPT -t nat -P OUTPUT ACCEPT

      ## reset the default policies in the mangle table.
      $IPT -t mangle -P PREROUTING ACCEPT
      $IPT -t mangle -P OUTPUT ACCEPT

      ## flush all the rules in the filter and nat tables.
      $IPT -F
      $IPT -t nat -F
      $IPT -t mangle -F

      ## erase all chains that's not default in filter and nat table.
      $IPT -X
      $IPT -t nat -X
      $IPT -t mangle -X

      #****************
      # rules 
      #________________
      $IPT -A INPUT -m state --state INVALID -j DROP 
      $IPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
      $IPT -A INPUT -p icmp -j ACCEPT 
      $IPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT 
      $IPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT 
      $IPT -A INPUT -p tcp -m tcp --dport 8443 -j ACCEPT 

      $IPT -A FORWARD -m state --state INVALID -j DROP 
      $IPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT 
      $IPT -A FORWARD -p icmp -j ACCEPT 
      #****************



      ip route add default scope global 
       nexthop via $ISP1 dev $NIC1 weight 1 
       nexthop via $ISP2 dev $NIC2 weight 1 
       nexthop via $ISP3 dev $NIC3 weight 1 
       nexthop via $ISP4 dev $NIC4 weight 1 

      #iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
      #iptables -t mangle -A PREROUTING -m mark ! --mark 0 -j ACCEPT
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 10
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 20
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 30
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 40
      #iptables -t mangle -A PREROUTING -j CONNMARK --save-mark


      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC1 -j SNAT --to-source $ISP1
      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC2 -j SNAT --to-source $ISP2
      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC3 -j SNAT --to-source $ISP3
      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

      #$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

      iptables -P FORWARD DROP
      #********************************
      # allow certain hosts full access
      #________________________________

      allowHost() 
      iptables -A FORWARD -i $LAN -s $1 -j ACCEPT 


      ip route flush cache


      #

      ifstat -bt 
       ens2 enp4s5f0 enp4s5f1 enp4s6f0 enp4s6f1 
       Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out
       1.88 0.00 0.94 0.47 0.00 0.00 0.00 0.00 0.00 0.00
       2.04 0.00 0.70 0.70 0.00 0.00 0.00 0.00 0.00 0.00
       8.09 6.98 1.17 0.70 0.47 0.00 1.40 0.47 0.47 0.00
       1.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.52 0.52 0.00 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.51 0.51 0.00 0.00 0.00 0.00 0.00 0.00
       2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       7.87 4.68 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
       1.78 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       4.66 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      30271.07 915.72 0.00 0.00 0.94 0.47 0.00 0.00 0.00 0.00
       5576.91 566.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       170.83 208.16 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
      37166.45 1144.21 56.66 30.21 0.00 0.00 0.00 0.00 0.00 0.00
      87935.34 2220.31 36.37 1.54 0.00 0.00 0.00 0.00 0.00 0.00
      11944.23 263.43 0.94 0.98 0.00 0.00 0.00 0.00 0.00 0.00
      25600.64 564.53 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.13 0.00 0.47 0.00 0.00 0.00 1.40 0.47 0.47 0.00
      26966.93 609.43 0.47 0.47 0.47 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.13 0.00 0.47 0.00 0.00 0.00 0.47 0.00 0.47 0.00
       4.03 5.73 2.72 2.72 0.47 0.00 0.00 0.00 0.00 0.00
       4.60 0.84 6.53 6.53 0.00 0.00 0.00 0.00 0.00 0.00


      #



      Network



      Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
       IF: ens2 state: up speed: 100 Mbps duplex: full mac: 00:1c:c0:85:7c:43
       Card-2: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s5f0 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:25:11:4e
       Card-3: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s5f1 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:25:11:4f
       Card-4: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s6f0 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:23:02:1a
       Card-5: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s6f1 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:23:02:1b





      16.04 networking iptables port-forwarding







      share|improve this question

















      4 ISPs are connected to the gateway, I tried using iptables for load balancing, but only one ISP is utilized for connecting to internet while the rest of the ISPs are idle as is evident from the output of ifstat.



      Kindly go through the script and advise suitably.
      Your help is much appreciated.



      # /etc/network/interfaces
      auto lo
      iface lo inet loopback

      auto enp4s5f0
      iface enp4s5f0 inet static
      address 192.168.7.2
      netmask 255.255.255.0
      gateway 192.168.7.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto enp4s5f1
      iface enp4s5f1 inet static
      address 192.168.8.2
      netmask 255.255.255.0
      gateway 192.168.8.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto enp4s6f0
      iface enp4s6f0 inet static
      address 192.168.9.2
      netmask 255.255.255.0
      gateway 192.168.9.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto enp4s6f1
      iface enp4s6f1 inet static
      address 192.168.10.2
      netmask 255.255.255.0
      gateway 192.168.10.1
      dns-nameservers 8.8.8.8 8.8.4.4

      auto ens2
      iface ens2 inet static
      address 192.168.2.190
      netmask 255.255.255.0
      #gateway 192.168.2.1
      dns-nameservers 8.8.8.8 8.8.4.4


      #

      ipt.sh 



      #!/bin/bash
      set -x
      IPT="/sbin/iptables"
      NIC1="enp4s5f0"
      NIC2="enp4s5f1"
      NIC3="enp4s6f0"
      NIC4="enp4s6f1"
      LAN="ens2" 
      ISP1="192.168.7.33"
      ISP2="192.168.8.33"
      ISP3="192.168.9.33"
      ISP4="192.168.10.33"
      IIP="192.168.2.190"
      echo 1 >| /proc/sys/net/ipv4/ip_forward
      echo 0 >| /proc/sys/net/ipv4/conf/all/rp_filter

      #***************
      # reset iptables
      #_______________
      ## reset the default policies in the filter table.
      $IPT -P INPUT ACCEPT
      $IPT -P FORWARD ACCEPT
      $IPT -P OUTPUT ACCEPT

      ## reset the default policies in the nat table.
      $IPT -t nat -P PREROUTING ACCEPT
      $IPT -t nat -P POSTROUTING ACCEPT
      $IPT -t nat -P OUTPUT ACCEPT

      ## reset the default policies in the mangle table.
      $IPT -t mangle -P PREROUTING ACCEPT
      $IPT -t mangle -P OUTPUT ACCEPT

      ## flush all the rules in the filter and nat tables.
      $IPT -F
      $IPT -t nat -F
      $IPT -t mangle -F

      ## erase all chains that's not default in filter and nat table.
      $IPT -X
      $IPT -t nat -X
      $IPT -t mangle -X

      #****************
      # rules 
      #________________
      $IPT -A INPUT -m state --state INVALID -j DROP 
      $IPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
      $IPT -A INPUT -p icmp -j ACCEPT 
      $IPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT 
      $IPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT 
      $IPT -A INPUT -p tcp -m tcp --dport 8443 -j ACCEPT 

      $IPT -A FORWARD -m state --state INVALID -j DROP 
      $IPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT 
      $IPT -A FORWARD -p icmp -j ACCEPT 
      #****************



      ip route add default scope global 
       nexthop via $ISP1 dev $NIC1 weight 1 
       nexthop via $ISP2 dev $NIC2 weight 1 
       nexthop via $ISP3 dev $NIC3 weight 1 
       nexthop via $ISP4 dev $NIC4 weight 1 

      #iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
      #iptables -t mangle -A PREROUTING -m mark ! --mark 0 -j ACCEPT
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 10
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 20
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 30
      #iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.25 -j MARK --set-mark 40
      #iptables -t mangle -A PREROUTING -j CONNMARK --save-mark


      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC1 -j SNAT --to-source $ISP1
      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC2 -j SNAT --to-source $ISP2
      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC3 -j SNAT --to-source $ISP3
      $IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

      #$IPT -A POSTROUTING -t nat -s 192.168.2.0/255.255.255.0 -o $NIC4 -j SNAT --to-source $ISP4

      iptables -P FORWARD DROP
      #********************************
      # allow certain hosts full access
      #________________________________

      allowHost() 
      iptables -A FORWARD -i $LAN -s $1 -j ACCEPT 


      ip route flush cache


      #

      ifstat -bt 
       ens2 enp4s5f0 enp4s5f1 enp4s6f0 enp4s6f1 
       Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out Kbps in Kbps out
       1.88 0.00 0.94 0.47 0.00 0.00 0.00 0.00 0.00 0.00
       2.04 0.00 0.70 0.70 0.00 0.00 0.00 0.00 0.00 0.00
       8.09 6.98 1.17 0.70 0.47 0.00 1.40 0.47 0.47 0.00
       1.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.52 0.52 0.00 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.51 0.51 0.00 0.00 0.00 0.00 0.00 0.00
       2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       7.87 4.68 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
       1.78 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       4.66 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      30271.07 915.72 0.00 0.00 0.94 0.47 0.00 0.00 0.00 0.00
       5576.91 566.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       170.83 208.16 0.47 0.00 0.47 0.00 0.47 0.00 0.47 0.00
      37166.45 1144.21 56.66 30.21 0.00 0.00 0.00 0.00 0.00 0.00
      87935.34 2220.31 36.37 1.54 0.00 0.00 0.00 0.00 0.00 0.00
      11944.23 263.43 0.94 0.98 0.00 0.00 0.00 0.00 0.00 0.00
      25600.64 564.53 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.13 0.00 0.47 0.00 0.00 0.00 1.40 0.47 0.47 0.00
      26966.93 609.43 0.47 0.47 0.47 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       2.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
       3.13 0.00 0.47 0.00 0.00 0.00 0.47 0.00 0.47 0.00
       4.03 5.73 2.72 2.72 0.47 0.00 0.00 0.00 0.00 0.00
       4.60 0.84 6.53 6.53 0.00 0.00 0.00 0.00 0.00 0.00


      #



      Network



      Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
       IF: ens2 state: up speed: 100 Mbps duplex: full mac: 00:1c:c0:85:7c:43
       Card-2: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s5f0 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:25:11:4e
       Card-3: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s5f1 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:25:11:4f
       Card-4: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s6f0 state: up speed: 100 Mbps duplex: full mac: 00:11:0e:23:02:1a
       Card-5: Intel 82546EB Gigabit Ethernet Controller (Copper) driver: e1000
       IF: enp4s6f1 state: up speed: 1000 Mbps duplex: full mac: 00:11:0e:23:02:1b





      16.04 networking iptables port-forwarding




      16.04 networking iptables port-forwarding






      share|improve this question
















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jun 15 at 4:52







      Purushothaman

















      asked Jun 14 at 9:22









      PurushothamanPurushothaman

      862 silver badges13 bronze badges




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