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ICMP Router Discovery Protocol

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In computer networking, the ICMP Internet Router Discovery Protocol (IRDP), also called the Internet Router Discovery Protocol,[1] is a protocol for computer hosts to discover the presence and location of routers on their local area network. Router discovery is useful for accessing computer systems on other nonlocal area networks.[2] IRDP uses Internet Control Message Protocol (ICMP) router advertisements and router solicitation messages to allow a host to discover the addresses of operational routers on the subnet.

It basically consists of 2 Message-Types (see this list) used for discovering local routers. The message type 9 is sent periodically or on request (using a message of type 10) to the local subnet from the local router(s) to propagate themselves. On boot, the client may send an ICMP-Message of type 10 to ask for local routers. When a client receives a message type 9, they add the router to their local routing table.

See also

References

  1. ^ "IRDP". etutorials.org. eTutorials.org. Retrieved 23 June 2016.
  2. ^ "ICMP Router Discovery Overview". www.juniper.net. Juniper Networks. Retrieved 23 June 2016.
  • RFC 1256: ICMP Router Discovery Messages