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Annotation of lucent/sys/man/3/arp, revision 1.1

1.1     ! root        1: .TH ARP 3 
        !             2: .SH NAME
        !             3: arp \- Internet Address Resolution Protocol
        !             4: .SH SYNOPSIS
        !             5: .nf
        !             6: .B bind -a #a /net/arp
        !             7: .sp
        !             8: .B /net/arp/ctl
        !             9: .B /net/arp/data
        !            10: .B /net/arp/stats
        !            11: .fi
        !            12: .SH DESCRIPTION
        !            13: The
        !            14: .I arp
        !            15: device provides the means by which the kernel resolves
        !            16: IP addresses
        !            17: into Ethernet addresses.
        !            18: A cache is maintained by the
        !            19: .B arp
        !            20: device to speed the process.
        !            21: .PP
        !            22: The
        !            23: .B ctl
        !            24: file controls the ARP cache maintained by the kernel.
        !            25: The
        !            26: .B flush
        !            27: control message invalidates all entries in the cache.
        !            28: The
        !            29: .B delete
        !            30: .I ipaddr
        !            31: control message invalidates a single cache entry.
        !            32: All IP addresses passed to the system are in the canonical textual form
        !            33: described in
        !            34: .IR ip (2).
        !            35: The
        !            36: .B perm
        !            37: .I ipaddr
        !            38: control message makes an existing cache entry permanent.
        !            39: .PP
        !            40: When the kernel boots,
        !            41: .B ipconfig
        !            42: sets up the IP stream and
        !            43: .B arpd
        !            44: opens
        !            45: .B #a/arp/data
        !            46: (see
        !            47: .IR ipconfig (8)).
        !            48: This establishes the ARP cache
        !            49: and enables
        !            50: .B arpd
        !            51: to receive all ARP packets from the network, which it uses to maintain the cache
        !            52: by writing the results of address resolution requests back into the cache.
        !            53: The IP stream module uses the cache to translate IP addresses.
        !            54: .PP
        !            55: Subsequent opens of the
        !            56: .B data
        !            57: file allow the contents of the cache to be examined.
        !            58: Each cache entry consists of an
        !            59: IP address, an Ethernet address, and the status of the entry.
        !            60: Entries may be
        !            61: invalid, permanent, or temporary.
        !            62: Permanent entries will never be aged from the cache.
        !            63: Temporary entries may be replaced by new addresses entered by the ARP server.
        !            64: .PP
        !            65: The file
        !            66: .B stats
        !            67: reports the cache performance.
        !            68: .SH SEE ALSO
        !            69: .IR ip (3),
        !            70: .IR ipconfig (8)
        !            71: .SH SOURCE
        !            72: .B /sys/src/9/port/devarp.c

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