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computers:firewall_configuration

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computers:firewall_configuration [2011/08/31 12:24] – chkuocomputers:firewall_configuration [2020/08/16 00:13] (current) – [References] chkuo
Line 5: Line 5:
 net.ipv4.ip_forward=1 net.ipv4.ip_forward=1
 </code> </code>
 +Apply by ''sudo sysctl -p''
  
 Then add the following lines to ''/etc/rc.local'' (so the rule is enabled on reboot): Then add the following lines to ''/etc/rc.local'' (so the rule is enabled on reboot):
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 Ext_IF="eth0" Ext_IF="eth0"
 Ext_IP="1.1.1.1" Ext_IP="1.1.1.1"
-Int_IF="eth3" +Int_IF="eth1" 
-iptables -t nat -A POSTROUTING -s 192.168.1.0/16 -o $Ext_IF -j SNAT --to-source $Ext_IP +Int_Net="192.168.1.0/24" 
-iptables -A FORWARD -s 192.168.1.0/16 -o $Ext_IF -j ACCEPT +iptables -t nat -A POSTROUTING -s $Int_Net -o $Ext_IF -j SNAT --to-source $Ext_IP 
-iptables -A FORWARD -d 192.168.1.0/16 -i $Int_IF -m state --state ESTABLISHED,RELATED -j ACCEPT+iptables -A FORWARD -s $Int_Net -o $Ext_IF -j ACCEPT 
 +iptables -A FORWARD -d $Int_Net -i $Int_IF -m state --state ESTABLISHED,RELATED -j ACCEPT
 </code> </code>
  
Line 21: Line 23:
 <code bash> <code bash>
 # destination NAT # destination NAT
-# forward ssh to Int_IP if the public Ext_IP_2 was used +# forward ssh to Int_IP if the external IP Ext_IP_2 was used 
 Ext_IP_2="1.1.1.2" Ext_IP_2="1.1.1.2"
 Int_IP="192.168.1.2" Int_IP="192.168.1.2"
Line 39: Line 41:
 ===== References ===== ===== References =====
   * [[https://help.ubuntu.com/10.04/serverguide/C/firewall.html]]   * [[https://help.ubuntu.com/10.04/serverguide/C/firewall.html]]
 +  * [[https://www.networkreverse.com/2020/06/how-to-build-linux-router-with-ubuntu.html]]
computers/firewall_configuration.1314764641.txt.gz · Last modified: 2011/08/31 12:24 by chkuo