Define Ports and Bulletin Types access-list cisco

In accession to defining ACL antecedent and destination, it is accessible to ascertain ports, ICMP bulletin types, and added parameters. A acceptable antecedent of advice for acclaimed ports is RFC 1700 leavingcisco.com. ICMP bulletin types are explained in RFC 792 leavingcisco.com.

The router can affectation anecdotic argument on some of the acclaimed ports. Use a ? for help.

access-list 102 admittance tcp host 10.1.1.1 host 172.16.1.1 eq ?

bgp Border Gateway Protocol (179)

chargen Character architect (19)

cmd Remote commands (rcmd, 514)

During configuration, the router additionally converts numeric ethics to added convenient values. This is an archetype area you blazon the ICMP bulletin blazon cardinal and it causes the router to catechumen the cardinal to a name.

access-list 102 admittance icmp host 10.1.1.1 host 172.16.1.1 14

becomes

access-list 102 admittance icmp host 10.1.1.1 host 172.16.1.1 timestamp-reply