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Annotation of cci/usr/src/man/man4/arp.4p, revision 1.1.1.1

1.1       root        1: .TH ARP 4P "18 July 1983"
                      2: .UC 4
                      3: .SH NAME
                      4: arp \- Address Resolution Protocol
                      5: .SH SYNOPSIS
                      6: .B pseudo-device ether
                      7: .SH DESCRIPTION
                      8: ARP is a protocol used to dynamically map between DARPA Internet
                      9: and 10Mb/s Ethernet addresses on a local area network.  It is
                     10: used by all the 10Mb/s Ethernet interface drivers and is not
                     11: directly accessible to users.
                     12: .PP
                     13: ARP caches Internet-Ethernet address mappings.  When an interface
                     14: requests a mapping for an address not in the cache, ARP queues the
                     15: message which requires the mapping and broadcasts
                     16: a message on the associated network requesting the address mapping.
                     17: If a response is provided, the new mapping is cached and any pending
                     18: messages are transmitted.  ARP itself is not Internet or Ethernet
                     19: specific; this implementation, however, is.  ARP will queue
                     20: at most one packet while waiting for a mapping request to be responded to;
                     21: only the most recently ``transmitted'' packet is kept.
                     22: .PP
                     23: ARP watches passively for hosts impersonating the local host (i.e. a host
                     24: which responds to an ARP mapping request for the local host's address)
                     25: and will, optionally, periodically probe a network looking for impostors.
                     26: .SH DIAGNOSTICS
                     27: .B "duplicate IP address!! sent from ethernet address: %x %x %x %x %x %x".
                     28: ARP has discovered another host on the local network which responds to
                     29: mapping requests for its own Internet address.
                     30: .SH SEE ALSO
                     31: ec(4), il(4)

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