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Cisco Router and Security Device Manager Version 2.2 Users Guide
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Chapter30 More About....
Services and Ports
IP Services
timestamp-request 13 Request for timestamp to be used for synchronization between
two devices.
traceroute 30 Message sent in reply to a host that has issued a traceroute
request.
unreachable 3 Destination unreachable. Packet cannot be delivered for
reasons other than congestion.
IP Services Port Number Description
aahp 51
eigrp 88 Enhanced Interior Gateway Routing Protocol. Advanced version of
IGRP developed by Cisco.
esp 50 Extended Services Processor.
icmp 1 Internet Control Message Protoc ol. Network layer protocol that
reports errors and provides other information relevant to IP packet
processing.
igmp 2 Internet Group Management Protocol. Us ed by IP hosts to report their
multicast group memberships to adjacent multicast routers.
ip 0 Internet Protocol. Network layer protocol offering connectionless
internetwork service.
ipinip 4 IP-in-IP encapsulation.
nos 94 n etwork operating system. A distributed file system protocol.
ospf 89 Open Shortest Path First. A link-state hierarchical routing algorithm.
pcp 108 Payload Compression Protocol
pim 103 Protocol-Independent Multicast. PIM is a multicast routing
architecture that allows the addition of multicast IP routing on
existing IP networks.
ICMP Messages Port Number Description