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Do not worry too much about the FORWARD chain in the basic firewall, because for the most part you will not be forwarding any packets, as this is more the job of a router. You really should be interested only in conversations with the host itself. The forwarding policy will take care of any packets that are trying to be forwarded through the host by dropping them immediately. Now you want to address traffic using the loopback host, lo. This is the internal 127.0.0.1 address of the host, and in order for the host to correctly function, you need to allow all traffic in and out on this interface. You can see the rules for this in Listing 2-12. Listing 2-12. Enabling Loopback Traffic puppy# iptables -A INPUT -i lo -j ACCEPT puppy# iptables -A OUTPUT -o lo -j ACCEPT Now add the rules to allow in and out HTTP traffic. This will allow you to run a Web server on port 80 of the host. But I have also added a new flag -m to the rules in Listing 2-13. The -m option enables the match function. This allows you to load modules that can match a variety of additional packet characteristics and allows you to filter on

them. In Listing 2-13 I have enabled the state module using the flag -m state. This allows you to perform state inspection and matching on the incoming packets, which is one of the key features of a stateful packet-filtering firewall such as iptables. Listing 2-13. Adding the HTTP Rules puppy# ipables -A INPUT -i eth0 -p tcp --dport http -d 192.168.0.1 -m state --state NEW,ESTABLISHED -j ACCEPT puppy# iptables -A OUTPUT -o eth0 -p tcp --sport http -m state --state ESTABLISHED -j ACCEPT

otherwise the framework remained unchanged. Windows Workflow Foundation 4.0 is a major evolution of the framework, the entire library has been rewritten from the ground up to be a leaner, meaner and far more efficient beast. Not only has it been rewritten to be easily testable, it now uses the Windows Presentation Framework for all UI elements. Add in tighter integration with Windows Communication Foundation and the new Dublin functionality and it's a very exciting time for Windows Workflows Foundation users.

loaded by default with most recent iptables releases. If it is not, you can load it with the insmod command,

By enabling the state module, you can check if a packet is part of a connection that is in one of four possible states: NEW, ESTABLISHED, RELATED or INVALID The NEW connection state indicates a freshly initiated connection where data has not passed back and forth You must allow the NEW connection state either incoming or outgoing if you want to allow new connections to a service For example, if you do not specify that the NEW connection state is accepted for incoming SMTP traffic on a mail server, then remote clients will not be able use the mail server to send e-mail An ESTABLISHED connection state indicates an existing connection that is in the process of transferring data You need to allow ESTABLISHED connections if you want a service to be able maintain a connection with a remote client or server.

For example, if you want to allow ssh connections to your host, you must allow NEW and ESTABLISHED incoming traffic and ESTABLISHED outgoing traffic to ensure the connection is possible The RELATED state refers to a connection that is used to facilitate another connection A common example is an FTP session where control data is passed to one connection and actual file data flows through another one The INVALID state is branded on a connection that has been seen to have problems in processing packets: they may have exceeded the processing ability of the firewall or be packets that are irrelevant to any current connection By specifying in your rules that traffic has to fit a certain state, you can eliminate potentially harmful packets getting to the services that you do need to keep open by only allowing traffic of a particular connection state.

Summary

If you click the Print command, the usual Print dialog box will display. If you want to skip the dialog box and go right to Print Preview or send the document to the printer, point to the arrow next to the Print command and choose Quick Print or Print Preview. See 12 for more in-depth coverage.

If you do not need to be able to make new connections using a service, you can simply specify that only established or related connections can use that service and preclude new connections from being made By adding the connection state you further enhance the principle of allowing only the bare minimum of access to our host The more closely you filter the traffic entering and leaving your host (by identifying it by as many possible characteristics as you can, including the protocol, port, interface, source or.

destination address, and now state), the more you reduce the risk that the incoming traffic is malicious and not intended for your host. You can also add the connection state to the maps of the host s traffic flow I discussed in the Choosing Filtering Criteria section (see Table 2-5). Table 2-5. Traffic Flow Incoming Including Connection State