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0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

Codes: S - static, P - periodic, E - EIGRP, N - NLSP, H - Holddown, + = detail 11 total IPXservers Table ordering is based on routing and server info Type Name NetAddress Port Route Hops ITF

We will conclude this section by examining the key details that are important to remember when configuring Cisco access lists Top-down processing Cisco access lists are evaluated in a sequential fashion beginning with the first entry As soon as a match is encountered, the access list processing is completed and no more entries are considered Therefore, it is important to put more specific entries toward the top of the access list Implicit deny all There is always an implicit "deny all" entry at the end of the access list Thus, any packet that does not explicitly match one of the access list entries will automatically be denied This behavior can be overridden by placing an explicit "permit all" as the last entry in the list New entries are added to the bottom Any new access list entries are automatically added to the bottom of the list This fact is important to remember when attempting to make modifications to an existing access list If modifications are necessary for an entry in an access list, it may be necessary to delete and recreate the entire access list This process can be mediated by creating the access list off-line in a text file and using TFTP to upload any changes to existing access lists Separate creation and application processes The actual application of an access list is done on an interface or subinterface basis The creation of an access list is done before an the list is applied to an interface Access lists reside in the configuration file and not be applied to any interface Similarly, an access list that has not been defined can be applied to an interface (see next paragraph) Undefined access lists If an access list that has not been created is referenced in the configuration, the effect will be the same as if the access list contained a "permit all" entry In other words, all traffic will be permitted We have found this principle does not always hold true, however We strongly recommend that you never apply an access list to an interface unless the access list has been created We also recommend removing the access list from the interface before making any changes to the access list.

fourth octet (binary)

0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

1203200 1206400 1209600 12012800 12016000 12019200

789A000000000001:0451 78A000000000001:0451 789A000000000001:8059

These principles will be discussed further as we illustrate specific examples throughout this chapter

Once you have calculated the network IDs, continue with figuring out the first valid address by turning on the low-order bit to get the following result:

120 120 120 120 120 120 120

second octet (binary)

2/01 3/02 2/01

Traditional IP access lists are available in two varieties: standard and extended Standard access lists allow filtering by source address only and are thus very limited in functionality Extended access lists allow filtering by source address, destination address, and upper-layer protocols We examine standard access lists first

0 00000000 00100000 01000000 01100000 10000000 10100000 11000000 11100000

third octet (binary)

0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

1 2 2

fourth octet (binary)

The basic format of a standard IP access list is: Access-list [1 99] [permit|deny] [ip address] [mask] [log] NoteThe log keyword is available only in IOS 113 and later versions Each access list is given a unique number that is used to inform the IOS of the type of access list you are defining This number is also used in all subsequent references to the access list Standard IP access lists are defined within the range 1 99 In IOS version 112, named access lists were introduced, allowing you to define names for your access lists These lists were created so you can delete specific entries in the access list without recreating the entire list Additional entries, however, are still added to the end of the access list Standard IP access lists allow filtering by source IP address only In the examples that follow, we will use the following diagram as a reference point, as shown in Figure 7 6

0 00000000 00000001 00000001 00000001 00000001 00000001 00000001 00000000

1203201 1206401 1209601 12012801 12016001 12019201

789A000000000001:0000 789A000000000001:8104 789A000000000001:4005 789A000000000001:405A 789A000000000001:405D 789A000000000001:1F80 789A000000000001:907B 789A000000000001:8600

To calculate the broadcast address, you should have enabled all of the host bits to get the list of addresses shown in the following table:

Suppose in Figure 7 6 that we want to allow only clients with node addresses 10 and 11 on segment 1 to have access to servers on segment 2 How would we accomplish this Our initial configuration is shown here: Interface ethernet 1 Ip access-group 1 out

120 120 120 120 120 120 120

second octet (binary)

2/01 2/01 2/01 2/01 2/01 2/01 2/01 2/01