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Annotation of 43BSDReno/share/doc/smm/02.config/e.t, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1986 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)e.t 6.2 (Berkeley) 6/3/86
        !             6: .\"
        !             7: .\".ds RH "Network configuration options
        !             8: .bp
        !             9: .LG
        !            10: .B
        !            11: .ce
        !            12: APPENDIX E. NETWORK CONFIGURATION OPTIONS
        !            13: .sp
        !            14: .R
        !            15: .NL
        !            16: .PP
        !            17: The network support in the kernel is self-configuring
        !            18: according to the protocol support options (INET and NS) and the network
        !            19: hardware discovered during autoconfiguration.
        !            20: There are several changes that may be made to customize network behavior
        !            21: due to local restrictions.
        !            22: Within the Internet protocol routines, the following options
        !            23: set in the system configuration file are supported:
        !            24: .IP \fBGATEWAY\fP
        !            25: .br
        !            26: The machine is to be used as a gateway.
        !            27: This option currently makes only minor changes.
        !            28: First, the size of the network routing hash table is increased.
        !            29: Secondly, machines that have only a single hardware network interface
        !            30: will not forward IP packets; without this option, they will also refrain
        !            31: from sending any error indication to the source of unforwardable packets.
        !            32: Gateways with only a single interface are assumed to have missing
        !            33: or broken interfaces, and will return ICMP unreachable errors to hosts
        !            34: sending them packets to be forwarded.
        !            35: .IP \fBTCP_COMPAT_42\fP
        !            36: .br
        !            37: This option forces the system to limit its initial TCP sequence numbers
        !            38: to positive numbers.
        !            39: Without this option, 4.3BSD systems may have problems with TCP connections
        !            40: to 4.2BSD systems that connect but never transfer data.
        !            41: The problem is a bug in the 4.2BSD TCP; this option should be used
        !            42: during the period of conversion to 4.3BSD.
        !            43: .IP \fBIPFORWARDING\fP
        !            44: .br
        !            45: Normally, 4.3BSD machines with multiple network interfaces
        !            46: will forward IP packets received that should be resent to another host.
        !            47: If the line ``options IPFORWARDING="0"'' is in the system configuration
        !            48: file, IP packet forwarding will be disabled.
        !            49: .IP \fBIPSENDREDIRECTS\fP
        !            50: .br
        !            51: When forwarding IP packets, 4.3BSD IP will note when a packet is forwarded
        !            52: using the same interface on which it arrived.
        !            53: When this is noted, if the source machine is on the directly-attached
        !            54: network, an ICMP redirect is sent to the source host.
        !            55: If the packet was forwarded using a route to a host or to a subnet,
        !            56: a host redirect is sent, otherwise a network redirect is sent.
        !            57: The generation of redirects may be inhibited with the configuration
        !            58: option ``options IPSENDREDIRECTS="0".''
        !            59: .br
        !            60: .IP \fBSUBNETSARELOCAL\fP
        !            61: TCP calculates a maximum segment size to use for each connection,
        !            62: and sends no datagrams larger than that size.
        !            63: This size will be no larger than that supported on the outgoing
        !            64: interface.
        !            65: Furthermore, if the destination is not on the local network,
        !            66: the size will be no larger than 576 bytes.
        !            67: For this test, other subnets of a directly-connected subnetted
        !            68: network are considered to be local unless the line
        !            69: ``options SUBNETSARELOCAL="0"'' is used in the system configuration file.
        !            70: .IP \fBCOMPAT_42\fP
        !            71: .br
        !            72: This option, intended as a catchall for 4.2BSD compatibility options,
        !            73: has only a single function thus far.
        !            74: It disables the checking of UDP input packet checksums.
        !            75: As the calculation of UDP packet checksums was incorrect in 4.2BSD,
        !            76: this option allows a 4.3BSD system to receive UDP packets from
        !            77: a 4.2BSD system.
        !            78: .LP
        !            79: The following options are supported by the Xerox NS protocols:
        !            80: .IP \fBNSIP\fP
        !            81: .br
        !            82: This option allows NS IDP datagrams to be encapsulated in Internet IP
        !            83: packets for transmission to a collaborating NSIP host.
        !            84: This may be used to pass IDP packets through IP-only link layer networks.
        !            85: See
        !            86: .IR nsip (4P)
        !            87: for details.
        !            88: .IP \fBTHREEWAYSHAKE\fP
        !            89: .br
        !            90: The NS Sequenced Packet Protocol does not require a three-way handshake
        !            91: before considering a connection to be in the established state.
        !            92: (A three-way handshake consists of a connection request, an acknowledgement
        !            93: of the request along with a symmetrical opening indication,
        !            94: and then an acknowledgement of the reciprocal opening packet.)
        !            95: This option forces a three-way handshake before data may be transmitted
        !            96: on Sequenced Packet sockets.

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