Search

Home >> Knowledgebase >> TCP/IP >> ICMP Router Advertisement messages

ICMP Router Advertisement messages

The ICMP Router Advertisement message is a part of ICMP Internet Router Discovery Protocol (IRDP). ICMP Internet Router Discovery Protocol (IRDP) is defined in RFC 1256. ICMP Router Advertisement allows a Router to advertise its presence in its network segment. Routers send ICMP Router Advertisement messages periodically as multicast messages to IPv4 multicast link-local address 224.0.0.1. 224.0.0.1 is the link-local multicast address to which all systems on local network segment listen. Thus a computer inside a network can discover their default gateway by listening to ICMP Router Advertisement messages.

ICMP Router Advertisement message Type number is 9. Please click next link, if you are not sure what are Type and Code fields in ICMP header.

icmp-router-advertisement-message-1.gif

icmp-router-advertisement-message-2.gif

<< ICMP Redirect messages
ICMP Router Solicitation messages >>
Related Tutorials
• Introduction to TCP/IP, Features of TCP/IP, TCP/IP History, What is RFC (Request for Comments)
• Seven Layers of OSI Model and functions of seven layers of OSI model
• Five layered TCP/IP model
• Network Layer (Layer 3)
• TCP/IP Data Encapsulation and Decapsulation
• Datalink Layer (Layer 2)
• Ethernet Frame Format
• What is MAC address or Layer 2 address or physical address
• IPv4 Protocol, IPv4 header and fields of IPv4 header
• IPv4 addresses, IPv4 Address Classes, IPv4 Address Classifications
• What is Subnet Mask
• What is network address
• Limited broadcast address
• Directed broadcast address
• What is limited broadcast in IPv4 and how limited broadcast works
• What is directed broadcast in IPv4 and how directed broadcast works
• What is default gateway
• What are private IP addresses - RFC 1918 private addresses
• APIPA Addresses (Automatic Private IP Addresses)
• What is loopback address in IPv4
• What is localhost
• Class A networks and Class A IP addresses
• Class B networks and Class B IP addresses
• Class C networks and Class C IP addresses
• Class D multicast IP addresses
• Subnetting - Part 1
• Subnetting - Part 2
• Subnetting - Part 3
• Subnetting - Part 4
• Subnetting - Part 5
• Subnetting - Part 6
• Variable Length Subnet Masking, VLSM, IP V4 Subnetting, subnetting tutorials, IP study guides, IP documentation, IP tutorials
• Supernetting, IP Supernetting, IP Supernetting tutorial, How to Supernet, Supernetting Guide, Supernetting Concepts
• How to find out the Network Address and Broadcast Address of a subnetted IPv4 address
• Address Resolution Protocol Tutorial, How ARP work, ARP Message Format
• Internet Control Message Protocol, ICMP, How ICMP Work, ICMP Header, ICMP Message Header
• ICMP message types
• ICMP Echo Request and Echo Reply messages
• ICMP Destination Unreachable messages
• ICMP Source Quench messages
• ICMP Redirect messages
• ICMP Router Solicitation messages
• ICMP Time Exceeded messages
• ICMP Parameter Problem messages
• ICMP Timestamp Request and Timestamp Reply messages
• ICMP Photuris messages