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INPUT -j ACCEPT INPUT -j ACCEPT
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-p icmp -i eth0 icmp-type -p icmp -i eth0 icmp-type
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INPUT -j ACCEPT -p icmp -i eth0 icmp-type -d 10.0.0.1
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# Turn on IP Forwarding echo 1 > /proc/sys/net/ipv4/ip_forward
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Initially, in the script you would clear your current iptables with the flush option (-F), and then set the policies (default targets) for the non-user-defined rules. IP forwarding should also be turned off while the chain rules are being set:
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One way to protect the private network from IP spoofing any packets is to check for any outside addresses on the Ethernet device dedicated to the private network. In this example, any packet on device eth1 (dedicated to the private network) whose source address is not that of the private network (! -s 192.168.0.0) is denied. Also, check to see if any packets coming from the outside are designating the private network as their source. In this example, any packets with the source address of the private network on any Ethernet device other than for the private network (eth1) are denied. The same strategy can be applied to the local host.
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# IP spoofing, deny any packets on the internal network # that has an external source address. iptables -A INPUT -j LOG -i eth1 \! -s 192.168.0.0/24 iptables -A INPUT -j DROP -i eth1 \! -s 192.168.0.0/24 iptables -A FORWARD -j DROP -i eth1 \! -s 192.168.0.0/24 # IP spoofing, deny any outside packets (any not on eth1) # that have the source address of the internal network iptables -A INPUT -j DROP \! -i eth1 -s 192.168.0.0/24 iptables -A FORWARD -j DROP \! -i eth1 -s 192.168.0.0/24 # IP spoofing, deny any outside packets with localhost address # (packets not on the lo interface (any on eth0 or eth1) # that have the source address of localhost) iptables -A INPUT -j DROP -i \! lo -s 127.0.0.0/255.0.0.0 iptables -A FORWARD -j DROP -i \! lo -s 127.0.0.0/255.0.0.0
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Then, you would set up rules to allow all packets sent and received within your system (localhost) to pass:
iptables -A INPUT -j ACCEPT -i lo
For the Web server, you want to allow access by outside users, but block access by anyone attempting to initiate a connection from the Web server into the private network. In the next example, all messages are accepted to the Web server, but the Web server cannot initiate contact with the private network. This prevents anyone from breaking into the local network through the Web server, which is open to outside access. Established connections are allowed, permitting the private network to use the Web server.
# allow communication to the Web server (address 10.0.0.2), port www iptables -A INPUT -j ACCEPT -p tcp -i eth0 --dport www -s 10.0.0.2
# Allow established connections from Web servers to internal network iptables -A INPUT -m state --state ESTABLISHED,RELATED -i eth0 \ -p tcp --sport www -s 10.0.0.2 -d 192.168.0.0/24 -j ACCEPT # Prevent new connections from Web servers to internal network iptables -A OUTPUT -m state --state NEW -o eth0 -p tcp \ --sport www -d 192.168.0.1.0/24 -j DROP
To allow access by the firewall to outside networks, you allow input by all packets except for ICMP packets. These are handled later. The firewall is specified by the firewall device, eth0. First, allow established and related connections to proceed:
# allow outside communication to the firewall, # except for ICMP packets iptables -A INPUT -m state --state ESTABLISHED,RELATED \ -i eth0 -p \! icmp -j ACCEPT
To prevent outsiders from initiating any access to your system, create a rule to block access by SYN packets from the outside using the state option with NEW. Drop any new connections on the eth0 connection (assumes only eth0 is connected to the Internet or outside network).
# prevent outside initiated connections iptables -A INPUT -m state --state NEW -i eth0 -j DROP iptables -A FORWARD -m state --state NEW -i eth0 -j DROP
To allow interaction by the internal network with the firewall, you allow input by all packets on the internal Ethernet connection, eth1. The valid internal network addresses are designated as the input source:
iptables -A INPUT -j ACCEPT -p all -i eth1 -s 192.168.0.0/24
To implement masquerading, where systems on the private network can use the gateway's Internet address to connect to Internet hosts, you create a NAT table (-t nat) POSTROUTING rule with a MASQUERADE target:
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