=== ch02.docx
[chap]2́@P[uɐ

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ȂpPbgLv`c[̔zuƂƁAlbg[N@̎ނɑłBT^Iȏ󋵂}2-1Ɏ܂Bŋ߂̃lbg[NŎgĂ3̎ȃlbg[N@łnuAXCb`A[^́Aꂼꂪ܂`ŒʐM߁A͂lbg[NɃpPbgLv`c[ݒuۂɂ͂̓_\lȂ΂Ȃ܂B

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v~XLX[h̎gp
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1͂̃u[hLXggtBbNŊw񂾂悤ɁAzXgۂɂ͎łȂpPbg󂯎AƂƂ悭܂BIPAhXɑΉMACAhX肷̂ɎgARP͂ǂȃlbg[NɂĂKiłAȊÕzXgɑgtBbN̂悢Ƃ܂BvMACAhX邽߂ɁAARP͐NCAgĂ悤FAu[hLXghCɂ邷ׂĂ̒ʐM@ɁAu[hLXgpPbg𑗐M܂B
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pPbg̔ṕAȊÕzXg̏コ܂ApPbg͂ɂƂĂ͂܂s悭܂BpPbg͂sƂẮAlbg[N𗬂邷ׂẴpPbgQƂāAdvȏ̒fЂȂłB
NIC̃v~XLX[hg΁AgtBbNׂ̂ĂmɃLv`邱Ƃł܂Bv~XLX[hő삷ꍇAAhXɊւ炸ANICׂ͂ẴpPbgzXgɓn܂BpPbgzXgɈnƁApPbgLv`c[̃AvP[V擾ĉ͂܂B
ŋ߂NIĈقƂǂv~XLX[hT|[gĂ܂BWiresharklibpcap/WinPcaphCo𓯍Ă邽߁AWiresharkGUINIC𒼐ڃv~XLX[hɐ؂ւ邱Ƃł܂ilibpcap/WinPcapɂĂ3͂ŏڂ܂jB
{̖ړIɂ́ANICƃv~XLX[h̎gp\OSKvɂȂ܂Bv~XLX[hŃLv`KvȂ̂́ALv`ĂC^tF[XMACAhXɒڑgtBbN݂̂QƂꍇłB

@Windows܂ނقƂǂOSŁANIC̃v~XLX[h́AȂƎgpł܂Bv~XLX[hgp邽߂̌@IɎ擾łȂȂÃlbg[NŃpPbgLv`sׂł͂܂


nuō\ꂽlbg[Nł̃Lv`
nuō\ꂽlbg[Nł̃Lv`͂ƂȒPłB1͂łłɊw񂾂ƂAgtBbN̓nûׂẴ|[gɗ܂BāAnuɐڑĂ@̃gtBbN͂邽߂ɂ́Anű󂢂Ă|[gɃpPbgLv`c[CXg[ꂽ@ڑ邾ł悢̂łB̋@툶A܂̋@픭ׂ̂Ă̒ʐMłȂÃnuɐڑꂽׂĂ̋@̒ʐMQƂł悤ɂȂ܂B}2-2ɂ悤ɁApPbgLv`c[́AnuɐڑĂ邷ׂĂ̋@̒ʐMQƂ邱Ƃł܂B

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[J[@R}h
Cisco@Enterasys@Nortel
set span <~[O|[g> <~[O|[g>
set port mirroring create <~[O|[g> <~[O|[g>
port-mirroring mode mirror-port <~[O|[g> monitor-port <~[O|[g>

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nu̎gp
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nugpċ@̒ʐMLv`邽߂ɕKvȂ̂́AnuƐ{̃lbg[NP[ułBKvȂ̂Â悤ɐڑ܂B
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@łɌĂƁAP[u𔲂ƂĂ@̎gp҂ɁAƌxƂĂƂ߂܂Bgp҂ЂCEO肷ꍇ͂ȂłB


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nuAꂪ{̃nuǂeXg܂傤B{ł΃bL[łB{̃nuǂ𔻒fŗǂ̕@́A2̋@ɐڑāAЕ̋@킪1Ƃ̒ʐMLv`ł邩ǂA܂lbg[N̑̋@v^Ȃǂ̋@Ƃ̒ʐMLv`ł邩ǂmF邱ƂłBꂪł΁A{̃nuƂƂɂȂ܂B
nu͎xȂ߁A݂ł͂܂萻Ă܂BXŖ{̃nuŵ͂قƂǕs\Ȃ߁AXw͂KvłBn̊wZł̒ÕiI[NV͋Mdȋ@łBwZ͔pOɃI[NVsƂ`tĂ邤ɁAÂ@킪uĂ邱Ƃ悭܂BƃR[ubhliŁÃnu𒆌ÃI[NVœ肵lXmĂ܂B܂eBay悢łAnuƋUXCb`܂邱Ƃ̂ŁAӂKvłiĖ󒍁Fł́AHtȂǂ̒ÃVbv𒍈Ӑ[TȂƁAẪnuɏ荇Ƃ͓ȂĂ܂܂BiɃs[^nuAVFA[hnuȂǂƖLĂΑvł傤jB

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}2-7@Barracuda񓝍^^bv

^bvɂ͒ʏdKvłAȂɂ̓RZgɂȂȂĂZԂł΃pPbgLv`\ȓdr^܂B

^^bv
^^bv̎g͊ȒPłBo̒ʐMLv`镨IȊĎ|[g1ȂłB
^^bvgăXCb`ɐڑꂽ1̋@ׂ̂Ă̒ʐMLv`ɂ́Â悤ɍs܂B

1D@XCb`O܂B
2Dlbg[NP[ü@ɂȂA^bv́úv|[gɂȂ܂B
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񓝍^^bv
񓝍^^bv͓^GłAʐM̃Lv`Ƃ_ł͂_܂BoʐM̊ĎɎg|[gЂƂ̂ł͂ȂA|[g2邩łBЕ̊Ď|[g̒ʐM̃Lv`ɗpi^bvɐڑꂽRs[^̒ʐMjAt̒ʐMi@ɓĂʐMjɎgƂł̂łB
XCb`ɐڑꂽ1̃Rs[^ׂ̂Ă̒ʐMLv`ɂ́Â悤ɍs܂B

1D@XCb`O܂B
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3Dʂ̃P[ü^bv́uóv|[gɂȂAlbg[NXCb`ɂȂ܂B
4D3{ڂ̃P[ü^bv́uĎAv|[gɂȂApPbgLv`c[Ƃċ@\@NICɂȂ܂B
5DŌ̃P[üuĎBv|[gɂȂApPbgLv`c[Ƃċ@\@̂ЂƂNICɂȂ܂B

񓝍^^bv͐}2-9̂悤ɐڑĂ͂łB

}2-9@񓝍^^bvgălbg[NgtBbNLv`
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150hx̃VvȃC[Tlbg^bvA5̉iƂȂƃNX̌t@Co[^bv܂ŁA푽lȃ^bvwł܂BM҂Net OpticsBarracuda Networks̃^bvgĂ܂AɖĂ܂BɂDꂽ^bvƎv܂B


ARPLbV|C]jO
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ARP
1͂ł́ApPbg̃AhXɂ͑3ŵ̂Ƒ2ŵ̂Ƃ2ނ邱Ƃwт܂B2w̃AhXiMACAhXj́A3w̃AhXƘAgĎg܂B{ł́AƊEW̗pɂāA3w̃AhXIPAhXƌĂт܂B
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ARPLbV|C]jO̓
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Cain & Abel̎gp
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