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For rules where chains may differ, you will still need to enter separate rules. In the myfilter2 script, the FORWARD chain has an ACCEPT policy, allowing all forwarded packets to the local network to pass through the firewall. If the FORWARD chain had a DROP policy, like the INPUT chain, then you may need to define separate rules under which the FORWARD chain could accept packets. In this example, the FORWARD and INPUT chains have different rules for accepting packets on the eth1 device. The INPUT rule is more restrictive. To enabled the local network to receive forwarded packets through the firewall, you could enable forwarding on its device using a separate FORWARD rule, as shown here.
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The INPUT chain would accept packets only from those in the local network.
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On Linux systems, you can set up a network in which you can have one connection to the Internet, which several systems on your network can use. This way, using only one IP address, several different systems can connect to the Internet. This method is called IP masquerading, where a system masquerades as another system, using that system's IP address. In such a network, one system is connected to the Internet with its own IP address, while the other systems are connected on a local area network (LAN) to this system. When a local system wants to access the network, it masquerades as the Internet-connected system, borrowing its IP address. IP masquerading is implemented on Linux using the ipchains firewalling tool. In effect, you set up a firewall, which you then configure to do IP masquerading. Currently, IP masquerading as does ipchains firewalling supports all the common network services, such as Web browsing, telnet, ping, and gopher. Other services, such as IRC, FTP, and Real Audio, require the use of certain modules. Any services you want local systems to access must also be on the firewall system because request and response actually are handled by services on that system. You can find out more information on IP masquerading at the IP Masquerade Resource Web site at http://ipmasq.cjb.net/. In particular, the Linux IP Masquerade mini-HOWTO provides a detailed, step-by-step guide to setting up IP masquerading on your system. IP masquerading must be supported by the kernel before you can use it. If your kernel does not support it, you may have to rebuild the kernel, including IP masquerade support, or use loadable modules to add it. See the IP Masquerade mini-HOWTO for more information. With IP masquerading, as implemented on Linux systems, the machine with the Internet address is also the firewall and gateway for the LAN of machines that use the firewall's Internet address to connect to the Internet. Firewalls that also implement IP masquerading are sometimes referred to as MASQ gates. With IP masquerading, the Internet-connected system (the firewall) listens for Internet requests from hosts on its LAN. When it receives one, it replaces the requesting local host's IP address with the Internet IP address of the firewall and then passes the request out to the Internet, as if the request were its own. Replies from the Internet are then sent to the firewall system. The replies the firewall receives are addressed to the firewall using its Internet address. The firewall then determines the local system to whose
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request the reply is responding. It then strips off its IP address and sends the response on to the local host across the LAN. The connection is transparent from the perspective of the local machines. They appear to be connected directly to the Internet. IP masquerading is often used to allow machines on a private network to access the Internet. These could be machines in a home network or a small LAN say, for a small business. Such a network might have only one machine with Internet access, and as such, only the one Internet address. The local private network would have IP addresses chosen from the private network allocations (10., 172.16., or 192.168.). Ideally, the firewall has two Ethernet cards: one for an interface to the LAN (say, eth1) and one for an interface to the Internet, such as eth0 (for dial-up ISPs, this would be ppp0 for the modem). The card for the Internet connection (eth0) would be assigned the Internet IP address. The Ethernet interface for the local network (eth1, in this example) is the firewall Ethernet interface. Your private LAN would have a network address like 192.168.0. Its Ethernet firewall interface (eth1) would be assigned the IP address 192.168.0.1. In effect, the firewall interface lets the firewall operate as the local network's gateway. The firewall is then configured to masquerade any packets coming from the private network. Your LAN needs to have its own domain name server, identifying the machines on your network, including your firewall. Each local machine needs to have the firewall specified as its gateway. Try not to use IP aliasing to assign both the firewall and Internet IP addresses to the same physical interface. Use separate interfaces for them, such as two Ethernet cards, or an Ethernet card and a modem (ppp0). Certain services like FTP and IRC can conflict with the IP masquerading setup where your firewall denies new connections. FTP operations use two ports, one to set up the connection and one to handle the data transfer. Connecting on the second port can appear to an IP masqueraded firewall as a new connection attempt, and it will deny it. To overcome this problem, special Netfilter modules are used for specific services. For the FTP service you use ip_masq_ftp and for IRC you use ip_masq_irc. There are also modules for quake, Real Audio (raudio), and VDO live (vdolive).
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IP Masquerading with Netfilter (NAT and iptables)
In Netfilter, IP masquerading is a NAT operation and is no longer integrated with packet filtering as in ipchains. IP masquerading commands are placed on the NAT table and treated separately from the packet-filtering commands. To implement IP masquerading with Netfilter, first make sure that the iptable_nat module is loaded (you can have this operation built into the kernel). Normally it is loaded by default.
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