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The code below is a portion of a sample access list configuration for a Cisco router applied to the serial 0 interface Only the relevant portions of the configuration are shown interface Serial0 ip address 17010101 2552552550 ip access-group 101 in ! access-list 101 permit tcp any any established access-list 101 permit udp any gt 1023 host 160102100 eq 53 access-list 101 permit ip any host 160102101 access-list 101 permit icmp any any echo-reply Figure 7 1 shows the router this sample configuration is taken from
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Figure 7 1: A diagram showing the router from which the sample configuration is taken
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For the moment, try not to be too concerned about interpreting what this access list is doing; we will cover this topic in greater detail later Instead concentrate on examining how the access list statements have been created and how the access list has been applied Notice that the access list has been created in one section and there is a separate command for applying the access list to the serial interface Also notice that the access list is applied to the serial interface in a particular direction The direction indicates whether packets are examined as they arrive (in) or leave (out) an interface on the router The English translation of this access list is included below Each access list entry appears on a separate line in bold
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Access-list 101 permit tcp any any established This permits TCP from any host to any host if the ACK or RST bit is set, which indicates it is part of an established connection Note that the first packet in a TCP conversation does not have the ACK bit set Essentially, the established keyword is designed to prevent TCP conversations from being initiated from the untrusted side of a router while allowing packets that are part of an already established TCP conversation to go through Access-list 101 permit udp any gt 1023 host 160102100 eq 53 This permits UDP from any host with a client source port (ports below 1024 are reserved for servers) to host 160102100 with destination port DNS (53) Access-list 101 permit ip any host 160102101 This permits IP from any host to host 160102101 Access-list 101 permit icmp any any echo-reply This permits ICMP from any host to any host if the packet is a response to a ping request (echoreply) Access-list 101 deny ip any any This denies all other packets (this line is implicit and does not appear unless explicitly typed) Some of the the access list syntax may be unfamiliar right now In later sections, we will cover the syntax of different types of IP access lists in greater detail
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For those unfamiliar with IOS commands, the block of code below displays the commands to actually create the access list shown eariler in the sample access list configuration code and apply it to the interface 2514a config term 2514(config)a access-list 101 permit tcp any any established 2514(config)a access-list 101 permit udp gt 1023 any host 160102100 eq 53 2514(config)a access-list 101 permit ip any host 160102101 2514(config)a access-list 101 permit icmp any any eq echo-reply 2514(config)a interface serial 0 2514(config-if)a ip access-group 101 in
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2514(config-if)a exit 2514(config)a exit 2514a Notice that the access list entries in the code here are entered in the same order in which they appear in the earlier configuration code This is no accident New access list entries are always added to the bottom of the existing access list; there is currently no mechanism for adding entries into a specific position in the access list without deleting and recreating the entire access list This is extremely important because, as we mentioned earlier, access lists are ordered lists They are evaluated from the top down Once a matching entry is found, the access list processing function exits and no more entries are considered The following flowchart shown in Figure 7 2 illustrates this process
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Figure 7 2: A logical flowchart illustrating how packets are matched against the entries in an access list
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The access list code contains several points of interest First, notice that only TCP/IP protocols are used in this example, yet numerous protocols other than those in the TCP/IP suite can be specified Table 7 1 shows the types of access lists that can be created for various protocols The number range on the right side of the table specifies the access list number range that is used when creating an access list of the specified type Table 7 1: Access Lists Protocols and Their Number Ranges
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