/proc/sys/net/ipv4/* ѿ

ip_forward - 
        0 - ̵ ()
        0 ʳ - ͭ

        ѥåȤ򥤥󥿡ե֤ǥե () ޤ

        ѿ̤ʤΤǡѹϤ٤Ƥͤξ֤
        ᤷޤ (ۥ RFC1122롼 RFC1812 ˽äơʲ
        ҤˤͤϤˤ 0 ʤۥȡ0 ʳʤ롼
        ͤȤʤޤ)

ip_default_ttl - 
         64

ip_addrmask_agent - 
        ICMP ADDRESS MASK request(׵)  reply() ޤ
         TRUE (롼)
               FALSE (ۥ)

ip_bootp_agent - 
        ɥ쥹 0.b.c.d ʬवѥåȤӤΥۥ
        ơ֥ɥ㥹ȡޥ㥹ȤΥѥåȤޤ
        Τ褦ʥѥåȰʳۤä̵뤵ޤ

         FALSE

ip_no_pmtu_disc - 
        Path MTU Discovery ̵ˤޤ
         FALSE

ip_fib_model - 
        0 - () ɸǥ롣٤ƤΥ롼 MAIN 饹ˤޤ
        1 - ǥեȥ롼Ȥ DEFAULT 饹˸ޤΥ⡼
            ϥݥꥷ롼ƥ󥰤ԤäƤ뾮 ISP ˤȤäơ
            ƤʤϤǤ
        2 - RFC1812 ǥ롣
            󥿡եηϩ MAIN 饹ˤޤ
            ȥηϩ DEFAULT 饹ˤޤ

IP ե饰ơ (ʬ)

ip_always_defrag - 
	0 - () ɸŪʥ롼⤷ϥۥѤɸꡣ
	1 - ˤ٤ƤΥե饰Ȥƹޤե
            ⤷Ʃ᷿ץۥȤѤޤ

ipfrag_high_thresh - 
        IP ե饰Ȥκƹ˻Ȥκ͡ŪѤ
	꤬ ipfrag_high_thresh ХȳƤ줿硢ե饰
	ȥϥɥ ipfrag_low_thresh ãޤǡѥåȤꤲ
	ߤޤ

ipfrag_low_thresh - 
        ipfrag_high_thresh 򻲾ȤƤ

ipfrag_time - 
         IP ե饰Ȥݻÿ

TCP ѿ

tcp_syn_retries - 
        TCP ͥ򳫻Ϥ뤿 SYN 
        255 Ķ٤ǤϤޤ

tcp_keepalive_time - 
        ץ饤ͭTCP ץ饤֥åФ
        ֳ֡
        ͡ 2 ֡

tcp_keepalive_probes - 
        TCP ͥڤ줿ȤꤹޤǤΥץ饤֥ץ
        ֤в

tcp_retries1 - 
tcp_retries2 - 
tcp_max_delay_acks - 
tcp_fin_timeout - 
tcp_max_ka_probes - 
tcp_hoe_retransmits - 
        ϻޤ

tcp_syncookies - 
        ͥ뤬 CONFIG_SYNCOOKIES 򥻥åȤѥ뤵줿
        ̣åȤ syn backlog queue դ줿
        syncookie ФޤϤ褯 'syn flood ' ɻ
        뤿ΤΤǤ
        ͡FALSE

tcp_stdurg - 
        TCP urg ݥ󥿥եɤHost requirements (rfc1122) ˤ
        äƲᤷޤʬΥۥȤϸŤ BSD βȤΤǡ
        Linux Ǥ򥻥åȤ̿Ǥʤ⤷ޤ
        ͡FALSE 

tcp_syn_taildrop  - 
tcp_max_syn_backlog - 
        ޤ ()

tcp_window_scaling - 
        RFC1323 줿ɥĴͭˤޤ

tcp_timestamps - 
        RFC1323 줿ॹפͭˤޤ

tcp_sack - 
        Ū (SACK) ͭˤޤ

tcp_retrans_collapse - 
        [ԤϢƤѹƤޤ]
        ĤΤץȥƥФ Bug-to-bug ߴ
        0:  TCP åΥХн褹뤿ᡢ˾ʥѥ
           ȤΤޤ (collapse ʤ) äƤߤޤ
        1: ˡcollapse 礭ʥѥåȤäƤߤޤ
        ͤ 1 Ǥ

ip_local_port_range - Ĥ
        ݡȤ֤Ȥ TCP  UDP ˤäƻȤ
        ݡȤϰϤޤǽοϥݡȤλϤο
        ܤοϺǸοǤΨι⤤ƥʤ顢
        32768-61000 ѹΤɤǤ礦

icmp_echo_ignore_all - 
icmp_echo_ignore_broadcasts - 
        ɤ餫 true ꤹȡͥƤ ICMP ECHO
        request 򤹤٤̵뤹뤫Τ֥ɥ㥹Ȥȥޥ
        㥹Ȥ̵뤹뤫줾ɤ餫ư򤷤ޤ

icmp_destunreach_rate - 
icmp_paramprob_rate - 
icmp_timeexceed_rate - 
icmp_echoreply_rate -  (ǥեȤͭǤϤʤ)
        Ф ICMP ѥåȤХ졼Ȥκͤ¤
        0 ̵¡ʳ jiffies(1) ˤä졼Ȥˤʤ
        ޤܤϥ򻲾ȤƤ

icmp_ignore_bogus_error_responses - 
        ĤΥ롼ϥ֥ɥ㥹ȥե졼Ф뵶ʪα
        뤳Ȥ RFC 1122 ˰ȿƤޤΤ褦ʰȿ̥
        ͥηٹ (warning) ȤƵϿޤ줬 TRUE ꤵ
        줿硢Τ褦ʷٹФե뤬ߤˤʤ
        ɤȤǤޤ
        ͡FALSE

(1) JiffiesͥΥ˥åȡi386 ʤ 1/100 áAlpha
ʤ 1/1024 äǤƥΤͤΤꤿ硢
/usr/include/asm/param.h  HZ 򻲾ȤƤ

conf/all/*:
        Ϥ٤ƤΥ󥿡եȿǤޤ

conf/interface/*
        󥿡ե̤ѹޤ

log_martians - 
        ͭʤɥ쥹äѥåȤ򥫡ͥΥ˵Ͽޤ

accept_redirects - 
        ICMP redirect message ޤ
         TRUE (ۥ)
               FALSE (롼)

forwarding - 
        Υ󥿡ե IP forwarding ͭˤޤ

mc_forwarding - 
        ޥ㥹Ȥ롼ƥ󥰤ޤͥ
        CONFIG_IP_MROUTE ꤷѥ뤵Ƥ뤳Ȥɬפǡ
        ˡޥ㥹ȥ롼ƥ󥰥ǡɬפˤʤޤ

proxy_arp - 
        proxy arp Ԥޤ

hidden - 
        ΥǥХդ줿ɥ쥹̤ΥǥХ鱣ޤ
        Τ褦ʥɥ쥹ϥɥ쥹μưλȤߤˤФ
        뤳ȤϤʤۥȤϥ֥ɥ㥹 ARP request 
        ARP request Υɥ쥹ˤȤޤ󤬡IP ̤
        ã뤳ȤϤǤޤΥե饰ϡͭǥХ
        "all" ξͭˤʤäƤ̤ȯ
        

shared_media - 
        ޤ

secure_redirects - 
        ǥեȥȥꥹȤ˵ܤ줿ȥ
        ICMP redirect message ޤ
         TRUE

redirects - 
        [ʸˤޤȥ꼫ΤƤ
        Τǡʸޤ]

bootp_relay - 
        ͥåȥΥۥȤǤϤ뤬ΥۥȰƤǤʤ
        ɥ쥹 0.b.c.d äѥåȤޤBOOTP 졼
        ǡ󤬤Τ褦ʥѥåȤޤեɤ뤳Ȥ
        ޤ

         FALSE
        ޤƤޤ

accept_source_route - 
        SRR ץäѥåȤޤ
         TRUE (롼)
               FALSE (ۥ)

rp_filter - 
        2 - RFC1812 ǻꤵ줿 reversed path ˤ륽
            ǧ򤷤ޤ󥰥ۡ [ؤηϩҤȤĤ
            äƤʤ] ۥȤȥ֥ͥåȥ롼˿侩
            줿ץǤ(RIP Τ褦) ٤Τʤץ
            ȥ¹Ԥ⤷ϥƥå롼Ѥ (롼
            ץե꡼Ǥʤ) ʣʥͥåȥξ꤬뤳Ȥ
            ޤ

        1 - () ̩Ǥʤ RR ե륿󥰤Ԥޤľ³
            줿󥿡եнΤ褦˸뤬ºݤˤ̤Υ
            󥿡եϤ줿ѥåȤ򡢤٤˴ޤ

        0 - ǧ򤷤ޤ

        Υץ̵ˤƤϤޤBSD ͳ褹뤹
        ٤ƤΥ롼ƥ󥰥եȥ (gated  routed ΤΤʤ)
        ϡȤʥѥåȤǤäƤ⡢μΥѥåȤˤäƺ
        𤵤Ƥޤޤͭˤ硢ǤϤޤ󤬡
        ip spoofing ɻߤǤޤ

        Υץ ip_forwading ˤʤäǥե
        ȤǥˤʤޤեɤԤʤۥȤǤ礷̣
        Ϥޤ󤷡ʥޥۡߥԲǽˤƤޤ
        礬ޤ

    ԡAlexey Kuznetsov <kuznet@ms2.inr.ac.ru>
    Andi Kleen <ak@muc.de>
ܸܹ <hng@ps.ksky.ne.jp>
    Ŀ餵 <trueheart@anet.ne.jp>
          ʿ <takavoid@palette.plala.or.jp>
          帶 <mizuhara@acm.org>
          ѱѤ <hotta@net-newbie.com>
