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14: Secure Connections
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Overview
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More and more data is shared over networks every day As companies have focused on developing software and hardware to allow fast, stable, and reliable network connectivity among companies, business partners, and the Internet, the related security issues have been neglected Risks resulting from this exchange of data were not initially considered, and mechanisms, therefore, were not available in the early hardware and software devices that allowed connectivity Today the market for network security products is substantial and growing To get a grasp on today's security problems, and to proactively prevent security breaches, network administrators can choose from a variety of security tools from Cisco and Microsoft This chapter discusses some of the most useful security hardware and software solutions
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Cisco Router IOS Security Technologies
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First there was a single workstation that had no external connections other than maybe a printer or some other peripheral device Then we gained the ability for two single nodes (such as workstations and servers) to communicate with each other As more and more nodes sitting within a single building were connected, the concept of a local area network (LAN) evolved The next major step in technology was communication among buildings within a company, and then the ultimate step (for now, at least): communication with other business partners and external resources of data Routers were the initial network devices that connected these entities This technological evolution happened so fast that the security risks associated with connecting private networks to public networks were all but overlooked Now Cisco and the majority of other vendors are continually modifying their operating systems to satisfy security requirements Although the security capabilities of a router are obviously less than those found on firewalls, router security can still fulfill the needs of some companies with simple security requirements This section describes the primary security features of Cisco routers
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Access Control Lists (ACLs)
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Cisco IOS software can filter traffic based on network and transport layer information Without a filter configured, the Cisco router is by default wide open and will allow all supported traffic through A router's access control list (ACL) is its primary source of security, determining which traffic to block and which traffic to allow Filtering takes place by examining the IP or TCP/UDP and ICMP headers Each of the fields within IP and TCP headers contains information that can include IP destination address IP source address IP protocol field TCP source port TCP destination port NoteAlthough this information is related specifically to IP traffic, packet filters do exist for other protocols such as IPX and AppleTalk For simplicity's sake, this discussion primarily concerns IP ACLs Multiple filters are defined for various destinations, sources, protocols, and port numbers Since each interface on a router can have ACLs applied, the filters are configured selectively based on the traffic that will traverse a certain interface The combination of all the filters to be applied to an interface makes up a single ACL Figure 14-1 demonstrates examples of router ACLs on one router
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Figure 14-1: Router ACLs NoteThe example in Figure 14-1 does not depict Cisco ACL syntax, but rather general descriptions used in configuring an ACL Here are some things to keep in mind about ACLs: Each interface can have up to two ACLs for a given protocol: an ACL defining rules for inbound traffic, and an ACL defining rules for outbound traffic Almost always, if you have an ACL on an interface allowing outbound traffic, and an ACL on the same interface denying inbound traffic, you need to include a permission on the ACL denying inbound traffic to allow established traffic (responses to traffic initiated from inside) If an interface does not have an ACL applied, then there are no filters applied and all traffic can flow freely If an interface has an ACL applied and there is only one entry in it, all other traffic is explicitly denied (This makes it very important that, when an ACL is implemented, you make sure all authorized traffic has an entry) Usually your ACL will reside on the last interface before the unprotected network often an inbound filter on the outside address
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Network Address Translation (NAT)
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Network Address Translation (NAT) is the process of converting one IP address into another IP address Following is a summary of some of NAT's key features; this technology is discussed in greater detail later in this chapter Network addresses can be translated statically or dynamically, depending on your requirements NAT is interface independent; it can be applied to any interface on the router that links inside-tooutside addressing schemes Typically, NAT operates on a border router between an inside private addressing scheme and an outside public addressing scheme The configuration for NAT takes place both globally on the network device and on the interface to which NAT is being applied Port Address Translation (PAT) is a subset of NAT that allows you to map multiple IP addresses to a single IP address, and use PATs to decipher the various connections PAT is beneficial in situations where limited registered IP addresses are available to use for NAT Whereas PAT allows many inside addresses to be serviced by one outside address, NAT translates inside addresses to a pool of several outside addresses Note that you don't need a one-for-one number of inside and outside addresses because NAT can be configured in overload mode, in which many inside addresses can be translated by just a few outside addresses
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