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<# for in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 1> $f; done>
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Fragment and source attacks Packet filtering also prevents tiny fragment attacks and source routing attacks Tiny fragment attacks use the IP fragmentation feature to create very small packets that split the TCP header information into separate packets, or fragments The success of this
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attack relies on fooling your filtering rules into permitting the first fragment to pass and subsequently allowing the rest of the fragments to pass unchecked To protect against this sort of attack, set the rules to deny all TCP packets that have the IP FragmentOffset header set to 1 To prevent source routing attacks, set the rules to drop any packets that do not contain the source route option
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The role of the proxy server is to monitor inbound and outbound traffic One benefit of using a proxy server is that it creates detailed logs of all data transfers Also, as they can examine the payload of a packet, proxy servers can filter inappropriate content There are two types of proxy servers: Application proxy servers For each protocol that needs to run through the proxy server, the application proxy server provides separate services One such example of a proxy server is a squid proxy server that provides HTTP and FTP proxies SOCKS proxy server This server provides generalized proxy services for applications that can use a SOCKS proxy server
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In order to use NAT to its full potential, IP masquerading can be used As a firewall tool, NAT provides the following benefits: Hidden internal network Because the internal networks are not routed over the Internet, networks behind the firewall are hidden from the rest of the world (ie, the Internet) The hidden network cannot be examined externally and so security is greatly enhanced Utilization of fewer valid IP addresses When the firewall uses NAT, the network needs fewer registered IP addresses Thus, IP masquerading allows all internal machines to access the Internet from behind the firewall using the firewall s IP address As a result, the Internet sees only the firewall machine and nothing beyond it Breaking through a properly secured Linux IP masquerading host and into the internal network is extremely difficult
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There are different ways to set up networks, and the architecture ultimately depends on the requirements of the network The simplest network has two components: an internal network and an external network with a firewall between the two Still, corporations have needs that exceed the simple two-network design As a result, separate networks are created to house the public access servers Often referred to as the demilitarized zone (DMZ), this network contains the mail, DNS, FTP, and Web servers For security, the DMZ is configured to provide limited access from the Internet to specific public information servers As different services and requirements are needed, new portions of the network can be designed The bottom line for creating all of these separated networks is to allow the application of different sets of security rules for each network
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Obviously, it is of great importance to make sure that the firewall machine is itself locked down and not left open to attacks The first step in doing this is to turn off all necessary services Then, rename or delete the current </etc/inetdconf> file and create a new one with this line:
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telnet stream tcp nowait root /usr/sbin/intelnetd intelnetd
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This allows only for Telnet service for remote management of the firewall system After creating the new inetd file, send the SIGHUP signal to inetd The /etc/passwd and /etc/shadow should contain an absolute minimum of accounts belonging to the administrator, root, bin, daemon, sync, shutdown, halt, and operator Furthermore, the system should not be part of an NIS domain, and the machine should be used only for firewall administration and operation Superfluous daemons (nfsd, dhcpd, named, atd, etc), as well as X Windows, should not run on the system To disable particular daemons from starting at run level three, go to /etc/rcd/rc3d and rename the
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