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.\" $NetBSD: sysctl.3,v 1.124 2003/11/23 07:11:04 jhawk Exp $
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.\" $NetBSD: sysctl.3,v 1.125 2003/11/23 07:22:19 wiz Exp $
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.\"
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -883,11 +883,12 @@ Returns 1 if the host accepts source routed packets.
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.It Li ip.subnetsarelocal
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Returns 1 if subnets are to be considered local addresses.
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.It Li ip.mtudisc
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If set to 1, Path MTU Discovery (RFC 1191) is enabled. When Path MTU
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Discovery is enabled, the transmitted TCP segment size will be
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determined by the advertised maximum segment size (MSS) from the
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remote end, as constrained by the path MTU. If MTU Discovery is
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disabled, the transmitted segment size will never be greater than
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If set to 1, Path MTU Discovery (RFC 1191) is enabled.
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When Path MTU Discovery is enabled, the transmitted TCP segment
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size will be determined by the advertised maximum segment size
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(MSS) from the remote end, as constrained by the path MTU.
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If MTU Discovery is disabled, the transmitted segment size will
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never be greater than
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.Li tcp.mssdflt
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(the local maximum segment size).
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.It Li ip.anonportmin
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@ -927,11 +928,12 @@ The maximum number of fragmented packets the node will accept.
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\-1 means that the node will accept as many fragmented packets as it receives.
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The flag is provided basically for avoiding possible DoS attacks.
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.It Li ip.checkinterface
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If set to non-zero, the host will reject packets addressed to it that arrive
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on an interface not bound to that address. Currently, this must be disabled
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if ipnat is used to translate the destination address to another local
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interface, or if addresses are added to the loopback interface instead of
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the interface where the packets for those packets are received.
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If set to non-zero, the host will reject packets addressed to it
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that arrive on an interface not bound to that address.
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Currently, this must be disabled if ipnat is used to translate the
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destination address to another local interface, or if addresses
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are added to the loopback interface instead of the interface where
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the packets for those packets are received.
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.It Li icmp.maskrepl
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Returns 1 if ICMP network mask requests are to be answered.
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.It Li icmp.errppslimit
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@ -957,7 +959,7 @@ Returns the default TCP receive buffer size.
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.It Li tcp.mssdflt
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Returns the default maximum segment size both advertized to the peer
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and to use when either the peer does not advertize a maximum segment size to
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us during connection setup or Path MTU Discovery
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us during connection setup or Path MTU Discovery
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.Li ( ip.mtudisc )
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is disabled.
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Do not change this value unless you really know what you are doing.
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