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document net.inet6.icmp6.mtudisc_{lo,hi}wat.

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itojun 2000-12-21 01:10:52 +00:00
parent fc03073896
commit 8f5f80ebfe
2 changed files with 20 additions and 2 deletions
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18
lib/libc/gen/sysctl.3
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@ -1,4 +1,4 @@
.\" $NetBSD: sysctl.3,v 1.70 2000/10/26 07:24:00 jdolecek Exp $
.\" $NetBSD: sysctl.3,v 1.71 2000/12/21 01:10:52 itojun Exp $
.\"
.\" Copyright (c) 1993
.\" The Regents of the University of California. All rights reserved.
@ -898,6 +898,8 @@ The currently defined protocols and names are:
.It icmp6 nodeinfo integer yes
.It icmp6 errppslimit integer yes
.It icmp6 nd6_maxnudhint integer yes
.It icmp6 mtudisc_hiwat integer yes
.It icmp6 mtudisc_lowat integer yes
.It udp6 sendspace integer yes
.It udp6 recvspace integer yes
.El
@ -1053,6 +1055,20 @@ For example, by setting the variable to 3, neighbor discovery layer
will take 3 consecutive hints in maximum.
After receiving 3 hints, neighbor discovery layer will perform
normal neighbor discovery process.
.It Li icmp6.mtudisc_hiwat
.It Li icmp6.mtudisc_lowat
The variables define the maximum number of routing table entries,
created due to path MTU discovery
.Pq prevents denial-of-service attacks with ICMPv6 too big messages .
When IPv6 path MTU discovery happens, we keep path MTU information into
the routing table.
If the number of routing table entries exceed the value,
the kernel will not attempt to keep the path MTU information.
.Li icmp6.mtudisc_hiwat
is used when we have verified ICMPv6 too big messages.
.Li icmp6.mtudisc_lowat
is used when we have unverified ICMPv6 too big messages.
Verification is performed by using address/port pairs kept in connected pcbs.
.El
.Pp
We reuse net.*.tcp for

4
sbin/sysctl/sysctl.8
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@ -1,4 +1,4 @@
.\" $NetBSD: sysctl.8,v 1.60 2000/11/08 22:48:32 eeh Exp $
.\" $NetBSD: sysctl.8,v 1.61 2000/12/21 01:10:52 itojun Exp $
.\"
.\" Copyright (c) 1993
.\" The Regents of the University of California. All rights reserved.
@ -262,6 +262,8 @@ privilege can change the value.
.It net.inet.udp.recvspace integer yes
.It net.inet.udp.sendspace integer yes
.It net.inet6.icmp6.errppslimit integer yes
.It net.inet6.icmp6.mtudisc_hiwat integer yes
.It net.inet6.icmp6.mtudisc_lowat integer yes
.It net.inet6.icmp6.nd6_delay integer yes
.It net.inet6.icmp6.nd6_maxnudhint integer yes
.It net.inet6.icmp6.nd6_mmaxtries integer yes