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Filtering is one of the most common tools used in security If something is trying to get in that you don t want to get in, you filter it This is accomplished in a variety of ways, but they all consist of the same basic elements: rules that accept traffic and rules that deny traffic These rules are typically arranged into sequential lists that the device steps through, one by one, as it receives traffic and attempts to find a match between rule and traffic If this methodology looks familiar, that s because it is also how many brands of firewalls handle network traffic While routers and other network devices typically make poor firewalls, they do have filtering capabilities that can be used to help secure the network as well as the routers and network devices themselves Filtering, while always following the same basic principle, is accomplished in many ways on different types of equipment One of the most common places to perform at least rudimentary filtering for your network is at the border routers In Cisco s IOS, these filters are referred to as access control lists (ACLs) Routers were originally built for the forwarding of traffic between networks, and current routers are optimized for that task Traffic filtering was later added as a convenience, so ACLs can assist in the control of traffic across the network, but they will not turn a router into a true firewall ACLs, like the majority of filtering rules, work on the principle of pattern matching Every packet that the router accepts is examined for a match between the packet and the rules in the ACL The rules are processed in sequential order, meaning that the packet is compared against the first rule, then the second, then the third, and so on, until a match is found or the packet has been compared to every rule At very high data rates, or for very long lists of rules, this can become computationally intensive This large drain on resources is the primary reason to avoid using a router as a firewall, but using ACLs to drop known rogue traffic at the borders to the network makes good sense.

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Figure 23-7: Network diagram for the sending and receiving rules example In this example, Pennywise sends three routing entries to Silver: 10000, 17216640, and 17216800 The update regarding the 101400 network is summarized into a route about the entire 10000 network, based on the sending rules for RIP Silver applies the /20 mask to the other two routes for the 1721600 network in this case, because they match the mask used on the link the updates were received on However, if a /19 mask were being used on the link between Silver and Pennywise, Silver would apply the /19 mask to the 17216640 network and a /32 mask to the 17216800 entry Like with a 19-bit mask, the entry has bits turned on in the host portion of the address (If you are confused, drop back to binary and divide the address into network, host, and subnet sections using a 19-bit mask) Note that this occurrence is very unlikely because, if Pennywise were using a /19 mask for the 172161920 link, he would have never sent the 17216640 or 17216800 entry in his update, as per the second RIP sending rule Therefore, with a /20 mask on the 172161920 network, Silver will never send an update about the 172161280 network to Pennywise To keep life simple, the easiest solution to the no-subnet-masks-in-the-update issue is either to use the same subnet mask for all subnets of a given class A, B, or C network, or to use a routing protocol (like RIP version 2 or EIGRP) that supports VLSM Table 23-3 summarizes the advantages and disadvantages of RIP version 1 Table 23-3: Advantages and Disadvantages of RIP Version 1 Disadvantage Inefficient (bandwidth intensive)

Table 23-3: Advantages and Disadvantages of RIP Version 1 Disadvantage Slow convergence in larger networks Supports only equal-cost load balancing Pinhole congestion can be a problem Generally loop free Limited scalability (15-hop maximum) Does not take bandwidth, delay, or reliability into account for metrics Does not support VLSM If a network is large, complex, and prone to change, routers may never fully converge Broadcasted updates can cause widespread waste of CPU cycles on hosts Does not support authenticated updates, meaning a rogue router could potentially disrupt routes

A typical access-list entry would look something like this:

As you can see, the disadvantages of RIP far outweigh the advantages Now, you might be wondering why anyone would ever use RIP if it's this problematic I've actually been asking myself that question for some time now, and the best answer I can give you is that it's easy to configure, and it's always supported In almost all cases, however, I would recommend EIGRP over RIP (if you are using Cisco routers) or OSPF (if you are using other routers) That is, of course, assuming that you actually need a dynamic routing protocol (See 22 for a list of reasons to use static routing) In a lot of cases, RIP is used simply because the administrators involved in the network implementation don't understand routing well enough to add the correct static routes It is easier for them to just let RIP figure everything out If you are caught in this situation, I advise you to reexamine the need for RIP In most cases, if you are small enough to use RIP, you should probably be using static routing instead

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RIP version 2 (defined primarily in RFC 2453) improves on some of version 1's shortcomings without drastically changing the protocol The following list details the most useful improvements to version 2:

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VLSM support Subnet masks are transmitted with RIP 2 updates Multicasted updates Updates are multicasted rather than broadcasted, reducing CPU cycle wastage for non-RIP hosts

Authentication support Cleartext authentication is supported for RFC-compliant routers (MD5-encrypted authentication is also supported on Cisco routers)

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