.\" This man page is Copyright (C) 1999 Andi Kleen <ak@muc.de>.
.\" Permission is granted to distribute possibly modified copies
.\" of this page provided the header is included verbatim,
.\" and in case of nontrivial modification author and date
.\" of the modification is added to the header.
.\" $Id: icmp.7,v 1.8 2001/01/14 05:30:41 hanataka Exp $
.\"
.\" Japanese Version Copyright (c) 1999 NAKANO Takeo all rights reserved.
.\" Translated 1999-12-06, NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated 2008-12-26, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.14
.\"
.\"WORD		destination route	Ԥϩ
.\"WORD		token packet filter	ȡ󡦥ѥåȡե륿
.\"
.TH ICMP 7 2008-11-24 "Linux" "Linux Programmer's Manual"
.SH ̾
icmp, IPPROTO_ICMP \- Linux IPv4 ICMP ͥ⥸塼
.SH 
Υͥ⥸塼 RFC\ 792 Ƥ Internet
Control Message Protocol ΤǤ롣
Υץȥϥ顼Τ餻ǤԤѤ롣
桼ϤΥ⥸塼Ȥľܤˤ̿Ǥʤ
Υ⥸塼ϥͥ¾Υץȥ̿
Υץȥ뤬 ICMP 顼򥢥ץꥱ쥤Ϥ
ͥ ICMP ⥸塼 ICMP ꥯȤФԤ
.PP
raw åȤץȥ
.B IPPROTO_ICMP
ǥץ󤹤С
桼ץȥϥʥåƤФ
ICMP ѥåȤ뤳ȤǤ롣
ܺ٤
.BR raw (7)
򻲾ȤΤȡ
åȤϤ ICMP ѥåȤΥפ
.B ICMP_FILTER
ץˤäƥե륿Ǥ롣
ICMP ѥåȤ (Ȥ桼åȤϤǤ)
˥ͥˤä () 롣
.LP
Linux Ǥ ICMP 顼ѥåȤΥ졼Ȥ򤽤줾Ф
¤Ƥ롣
.B ICMP_REDIRECT

.B ICMP_DEST_UNREACH
夷ѥåȤιԤϩ (destination route) ¤롣
.SS /proc 󥿥ե
ICMP ǤϡĤΥХѥ᡼ꤹ뤿
.I /proc
ե뷲ѰդƤ롣
Υѥ᡼ˤϡ
.I /proc/sys/net/ipv4/
ǥ쥯ȥΥեɤ߽񤭤ǥǤ롣
Υѥ᡼ΤۤȤɤ ICMP פФ졼
(rate limitation) Ǥ롣
Linux 2.2  ICMP ¤˥ȡ󡦥Хåȡե륿
(token bucket filter) Ѥ롣
.\" FIXME better description needed
줾ͤϡСȤθ˥ȡ󡦥Хåȡե륿ꥢ
ޤǤΥॢȤñ̤ɽΤǤ롣Ǿñ(jiffy)
ƥ¸ñ̤ i386 ƥ̾ 10msalpha  ia64 Ǥ
1ms Ǥ롣
.TP
.IR icmp_destunreach_rate " (Linux 2.2  2.4.9 ޤ)"
.\" Precisely: from 2.1.102
ICMP ãѥå (Destination Unreachable packet) 졼ȡ
Υ롼ȤޤϹԤ˥ѥåȤ졼Ȥ¤롣
¤ϡ
path MTU discovery ɬפ
.B ICMP_FRAG_NEEDED
ѥåȤˤϱƶʤ
.TP
.IR icmp_echo_ignore_all " (Linux 2.2 ʹ)"
.\" Precisely: 2.1.68
ͤ󥼥ξϡ Linux Ϥ٤Ƥ
.B ICMP_ECHO
׵̵뤹롣
.TP
.IR icmp_echo_ignore_broadcasts " (Linux 2.2 ʹ)"
.\" Precisely: from 2.1.68
ͤ󥼥ξϡ Linux ϥ֥ɥ㥹ȥɥ쥹줿٤Ƥ
.B ICMP_ECHO
׵̵뤹롣
.TP
.IR icmp_echoreply_rate " (Linux 2.2  2.4.9 ޤ)"
.\" Precisely: from 2.1.102
.B ICMP_ECHOREQUEST
ѥåȤ˱
.B ICMP_ECHOREPLY
ѥåȤκ졼ȡ
.TP
.IR icmp_errors_use_inbound_ifaddr " (Boolean; default: disabled; Linux 2.6.12 ʹ)"
.\" The following taken from 2.6.28-rc4 Documentation/networking/ip-sysctl.txt
̵ˤȡICMP 顼åϡ
ϥ󥿥եΥץ饤ޥꥢɥ쥹롣

ͭˤȡ顼å ICMP 顼θȤʤäѥåȤ
󥿥եΥץ饤ޥɥ쥹롣
ưϡ¿ΥͥåȥԤ롼ФƴԤƤΤǤꡢ
ˤʣʥͥåȥ쥤ȤΥǥХåưפˤʤ롣

򤵤줿󥿥եǥץ饤ޥꥢɥ쥹¸ߤʤϡ
˴ؤ餺ǽΥ롼ץХåʳΥ󥿥եǡ
ץ饤ޥꥢɥ쥹ĥ󥿥եΥץ饤ޥꥢɥ쥹Ѥ
դ뤳ȡ
.TP
.IR icmp_ignore_bogus_error_responses " (Boolean; default: disabled; Linux 2.2 ʹ)"
.\" precisely: since 2.1.32
.\" The following taken from 2.6.28-rc4 Documentation/networking/ip-sysctl.txt
롼ˤϡRFC1122 ˰ȿ֥ɥ㥹ȥե졼Ф
αΤ롣
Τ褦ʰȿ̾參ͥηٹȤƥ˵Ͽ롣
Υѥ᡼ͭˤȡͥϤΤ褦ʷٹФʤʤꡢ
ե˻Τ褦ʾ󤬵ϿΤ򤱤뤳ȤǤ롣
.TP
.IR icmp_paramprob_rate " (Linux 2.2  2.4.9 ޤ)"
.\" Precisely: from 2.1.102
.B ICMP_PARAMETERPROB
ѥåȤκ졼ȡ
ΥѥåȤ IP إåĥѥåȤ夷
롣
.TP
.IR icmp_ratelimit " (integer; default: 1000; Linux 2.4.10 ʹ)"
.\" The following taken from 2.6.28-rc4 Documentation/networking/ip-sysctl.txt
̤
.I icmp_ratemask
() ˥ޥå ICMP ѥåȤΡ
ؤ졼Ȥκͤ¤롣
0 ϥ졼¤̵ˤ뤳Ȥ
0 ʳͤϱ֤κǾֳ (ߥñ) 򼨤
.TP
.IR icmp_ratemask " (integer; default: ; Linux 2.4.10 ʹ)"
.\" The following taken from 2.6.28-rc4 Documentation/networking/ip-sysctl.txt
졼¤Ԥ ICMP פޥ

ͭӥå:       IHGFEDCBA9876543210
.br
ǥեȥޥ: 0000001100000011000 (0x1818)

ӥå (ͥ륽ե
.I include/linux/icmp.h
򻲾):

.in +4n
.nf
0 Echo Reply
3 Destination Unreachable *
4 Source Quench *
5 Redirect
8 Echo Request
B Time Exceeded *
C Parameter Problem *
D Timestamp Request
E Timestamp Reply
F Info Request
G Info Reply
H Address Mask Request
I Address Mask Reply
.fi
.in

ꥹդӥåȤϡǥեȤǥ졼¤ͭ
ʤäƤ (嵭ΥޥΥǥեȤ⻲)
.TP
.IR icmp_timeexceed_rate " (Linux 2.2  2.4.9 ޤ)"
.B ICMP_TIME_EXCEEDED
ѥåȤκ졼ȡ
ΥѥåȤϥѥåȤޤ¿ hop ̲ᤷˡ
롼פɤ롣
.SH С
.B ICMP_ADDRESS
׵Ф륵ݡȤ 2.2 Ǻ줿
.PP
.B ICMP_SOURCE_QUENCH
 Linux 2.2 Ǻ줿
.SH 
¾¿μǤϡ
.B IPPROTO_ICMP
raw åȤݡȤƤʤ
εǽϰܿɬפʥץǤѤ٤Ǥʤ
.\" not really true ATM
.\" .PP
.\" Linux ICMP should be compliant to RFC 1122.
.PP
Linux 롼ȤưƤʤȤˤϡ
.B ICMP_REDIRECT
ѥåȤʤ
ޤ餬Τ⡢ȯ롼ƥ󥰥ơ֥Ƥ
Ťȥǡ쥯ȡ롼 (redirect route) 
Ŭʻ֤θ˴ڤˤʤäƤ˸¤롣
.PP
.B ICMP_TIMESTAMP
֤ 64 ӥåȤΥॹפϡ
1970 ǯ 1  1 ηв֤ߥñ̤ɽΤǤ롣
.PP
Linux ICMP  ICMP 뤿 raw åȤѤ롣
raw åȤ
.BR netstat (8)
νϤ 0 inode ȤƽϤ롣
.SH Ϣ
.BR ip (7)
.PP
.BR RFC\ 792 :
ICMP ץȥ