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ACL Overview
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ACLs allow you to filter traffic, restrict telnets to the router, filter routing
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information, prioritize WAN traffic, trigger dialup connections, change administrative distances of routes, and do many other things
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ACLs can be created using either numbers or names and in two basic types:
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standard and extended Standard ACLs allow you to filter only the source IP address, whereas extended IP ACLs allow you to filter on source and destination addresses, TCP/IP protocols, and protocol information
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The router can take one of two actions when a match is found on an ACL:
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permit or deny ACLs are processed top-down, where the order of the statements is important Upon the first match, no other statements are processed
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There is an implicit deny at the end of the list You cannot filter traffic the
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router itself originates
When adding ACL statements, note that they are always added to the
bottom Only named ACLs allow you to delete a specific entry
Basic ACL Configuration
The access-list command creates an ACL and the ip access-
group command activates the ACL on an interface You can filter traffic as it enters (in) or leaves (out) an interface To delete a complete access control list, use the no access-list command, followed by its number
Standard IP ACLs use numbers in the ranges 1 99 and 1300 1999, and
extended IP ACLs use list numbers 100 199 and 2000 2699
A wildcard mask is like an inverted subnet mask A 0 in a bit position of
the wildcard mask means the corresponding bit position in the condition s address must match that in the IP packet A 1 in a bit position of the wildcard mask means there doesn t have to be a match
A wildcard mask of 0000 means that the entire address must match
Precede the word host before an address accomplishes the same thing A wildcard mask of 255255255255 indicates that any address matches: you can replace the address and wildcard mask with the keyword any
22: Access Control Lists
To invert a subnet mask into a wildcard mask, subtract each octet in the
subnet mask from 255, which will result in the corresponding octet value for the wildcard mask
ACL Types
Standard ACLs can filter only on the source IP address If you omit the
wildcard mask, it defaults to 0000 Use the access-class command to activate a standard ACL to restrict telnet access to a router
Use the terminal monitor command to view console output on non-
console connections, such as VTYs
Extended IP ACLs allow you to filter on both the source and destination
IP addresses (where you must specify the wildcard mask for both), the IP protocol (TCP, UDP, ICMP, and so on), and protocol information (such as ICMP message types or TCP and UDP source and destination port numbers) If you want to match on all IP traffic, use the keyword ip for the protocol parameter
Use the ip access-list standard|extended ACL_name
command to create a named ACL This takes you into the ACL Subconfiguration mode
Use the remark parameter to add a comment about an ACL statement or
statements
The show running-config command will display your configured
ACLs and the interfaces on which they are activated The show ip interfaces command shows the ACLs activated on a router s interfaces The show [ip] access-lists command displays the statements in a router s ACLs
ACLs support sequence numbers that allow you to delete an existing
statement in the ACL or insert a statement in your current ACL configuration
ACL Placement
Standard ACLs should be placed as close to the destination devices as possible Extended ACLs should be placed as close to the source devices as possible
Self Test
SELF TEST
The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
ACL Overview
1 Which of the following is not a feature of ACLs A B C D A B C D Restricting telnet access to a router Prioritizing WAN traffic Filtering traffic from the router Triggering dialup phone calls The order of the statements is automatic All statements are processed If no match is found, the packet is permitted You can delete a specific statement in a named list
2 Which of the following is true concerning ACLs
Basic ACL Configuration
3 Which command activates an IP ACL on a router s interface A B C D access-list ip access-group access-class access-group
4 Enter the wildcard mask value to match on every bit position in an address: __________ 5 Enter the wildcard mask value for the subnet mask of 2552552480: __________
ACL Types
6 Which of the following can a standard IP ACL match on A B C D Destination address IP protocol IP protocol information None of the above
22: Access Control Lists
7 Enter the standard IP ACL command to permit traffic from 19216810/24, using a list number of 10: __________ 8 Enter the extended IP ACL command to permit all ICMP traffic from 1721600/16 to 1721700/17, using a list number of 101: __________ 9 Enter the router command to activate an ACL with a name of test inbound on an interface: __________
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