Visualizing Internet Routing Changes - IT

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    \msvacmzm`g M`xft`fx Tkvxm`g Oba`gfs

    "@fxwkte sfovtmx} , ^tkxkokcs-

    Adsxtaox

    Xkha}s M`xft`fx ~tk|mhfs a gckdac

    haxa hfcm|ft} sft|mof xk imccmk`s kl f`h vsfts

    a`h tkvxm`g ~tkxkokcs ~ca} a otmxmoac tkcf m`

    xbms sft|mof. Mx ms mi~ktxa`x xk df adcf xk

    mhf xml} a`h hmag`ksf a`} ~tkdcfis

    koovttm`g m` M`xft`fx tkvxm`g. Bkwf|ft# xbfM xft`fxs sbfft smzf iaefs xbms xase

    hmllmovcx. K`f oa``kx fasmc} frxtaox kvx xbfiksx mi~ktxa`x kt tfcf|a`x tkvxm`g

    m`lktiaxmk` ltki xbf catgf aikv`xs kl haxa

    okccfoxfh ltki ivcxm~cf tkvxfts. Xk xaoecf

    xbms ~tkdcfi# wf ba|f hf|fck~fh Cm e)

    Ta`e# a xkkc xk |msvacmzf M`xft`fx tkvxm`g

    oba`gfs ax xbf gckdac soacf. Cm e)Ta`e

    wfmgbs cm`es m` a xk~kckgmoac gta~b d} xbf

    `vidft kl tkvxfs oattmfh k|ft faob cm`e a`h

    |msvacc} oa~xvtfs oba`gfs m` cm`e wfmgbxs m`

    xbf lkti kl a xk~kckgmoac gta~b wmxbahjvsxadcf smzf. Vsm`g Cm`e)Ta`e# `fxwkte

    k~ftaxkts oa` fasmc} kdsft|f mi~ktxa`x

    tkvxm g oba`gfs ltki iassm|f aikv xs kl

    tkvxm g haxa# hmsok|ft kxbftwmsf v``kxmofh

    tkvxm`g ~tkdcfis# v`hftsxa`h xbf mi~aox kl

    xk~kckgmoac f|f`xs# a`h m`lft tkkx oavsfs kl

    kdsft|fh tkvxm`g oba`gfs.

    M`hfr Xftis @fxwkte |msvacmzaxmk`#m`lktiaxmk` |msvacmzaxmk`# M`xft fx tkvxm g#

    m`xftaoxm|f gta~bmos# haxa a`ac}sms# |msvac

    im`m`g.

    1 M@XTKHVOXMK@XKHA]_ M`xft`fx ~tk|mhfs a

    gckdac haxa hfcm|ft} sft|mof xk imccmk`s

    kl f`h vsfts. @fxwkte tkvxm`g ~tkxkokcs

    ~ca} a otmxmoac tkcf m` xbms hfcm|ft}

    sft|mof d} sxfftm g haxa xtallmo xkwath

    xbfmt hfsxm axmk`s. Fllfoxm|f hmag`ksms

    xkkcs atf mi~ftaxm|f xk f`adcf `fxwktek~ftaxkts xk mhf`xml} tkvxm`g ~tkdcfis m`

    xbms gckdac s}sxfi. _f|ftac hmag`ksms

    xkkcs# svob as xtaoftkvxf a`h DG^ca} atfa|amcadcf lkt a`ac}zm`g tkvxm`g oba`gfs

    tfgathm`g a sm`gcf hfsxm`axmk`. Bkwf|ft#

    a lmdft ovx ia} oba`gf xbf tkvxfs xk acatgf `vidft kl hfsxm`axmk`s# tfsvcxm`g m`

    smg`mlmoa`x `fxwkte xtallmo ik|fif`x

    wbmob ia}# m` xvt # xtmggft tkvxm`gh}`aimos m` kxbft atfas. Xbvs# mx ms

    fssf`xmac xk df adcf xk kdsft|f `fxwkte

    tkvxm`g oba`gfs ax xbf M`xft`fx soacf xk

    v`hftsxa`h xbf k|ftacc mi~aox kl a sm`gcfxk~kckgmoac f|f`x.

    Xk xbms f`h# wf ba|f hf|fck~fh

    Cm`e)Ta`e# a xkkc xk |msvacmzf tkvxm g

    oba`gfs m` xbf gckdac M`xft`fx. @kx k`c}oa` a ~moxvtf oa~xvtf xbf ifa`m`g kl

    xbkvsa`hs kl wkths# dvx mx oa` acskcfah xk m`sxa`x oki~tfbf`smk`. Bkwf|ft#

    a lv`haif`xac obaccf`gf laom`g xbf Cm`e)

    Ta`e hfsmg` ms bkw xk oa~xvtf tkvxm`g

    oba`gfs m` a oki~tfbf`sm|f |msvac ~moxvtf# gm|f` xbf sbfft smzf# xbf

    xk~kckgmoac oki~cfrmx}# a`h xbf bmgbc}

    h}`aimo `axvtf kl xbf M`xft`fx tkvxm`gs}sxfi. Imccmk`s kl tkvxm`g v~haxfs atf

    gf`ftaxfh hamc} a`h xbftf ms `k fas} wa}xk frxtaox m`lktiaxmk` adkvx iksxmi~ktxa x kt iksx tfcf|a`x tkvxm`g

    oba`gfs. Acc xbf frmsxm`g sm`gcf

    hfsxm`axmk` hmag`ksms xkkcs vxmcmzf a

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    s~fomlmo sxatxm g ~km x a`h a gm|f`

    hfsxm`axmk` xk xtaof xbf tkvxm`g ~axb kt

    xbf ~axb oba`gfs. Xk fraim`f tkvxm`goba`gfs ax catgf# bkwf|ft# k`f hkfs `kx

    ba|f a ocfat sxatxm`g kt f`hm`g ~km`x xklkovs k`.

    M`sxfah# k`f ms laom`g a xk~kckg}wmxb k|ft 4>#>>> `fxwktes "M`xft`fx

    Avxk`kikvs _}sxfis- a`h 12>#>>>

    hfsxm`axmk` f xtmfs. Wf `ffh a `fwok`of~xvac ikhfc xbax oa` oa~xvtf xbf

    `fxwkte dfba|mkt kl aggtfgaxf tkvxm g

    oba`gfs.Cm e)Ta`e frxtaoxs xbf xkxac

    `vidft kl tkvxfs oattmfh k|ft m`hm|mhvac

    cm`es m` xbf M`xft`fx xk~kckg}# oaccfh cm`ewfmgbx# a`h ifasvtfs xbf oba`gfs m` xbf

    `vidft kl tkvxfs k` faob cm`e as a wa}

    xk oa~xvtf aggtfgaxf tkvxm`g oba`gfs. Xk

    tfhvof xbf haxa smzf xk a oki~tfbf`smdcfcf|fc# Cm`e)Ta`e vsfs a` m`~vx)lmcxft xk

    frxtaox xbf iksx mi~ktxa`x kt tfcf|a x

    tkvxm`g oba`gfs ltki xbf catgf aikv`xkl tkvxm`g haxa. Xk f`adcf `fxwkte

    k~ftaxkts xk qvmoec} s~kx ~kxf`xmacc}

    ~tkdcfiaxmo xmif ~ftmkhs lkt lvtxbft

    m`|fsxmgaxmk`# Cm`e)Ta`e ~tk|mhfs a`aoxm|mx} ~ckx xbax sviiatmzfs tkvxm g

    oba`gfs ack`g xbf xmif hmif`smk`. Cm`e)

    Ta`e acsk kllfts xbf vsft a` kvx~vx lmcxftxk ahjvsx xbf hms~ca} hf`smx} m`

    |msvacmzm`g tkvxm`g h}`aimos. Vsm`g oasf

    sxvhmfs# wf sbkw bkw xbf adk|f lfaxvtfs ~tk|mhfh d} Cm`e)Ta`e oa` bfc~

    `fxwkte k~ftaxkts im`f a`h v`hftsxa`h

    m xftfsxm`g tkvxm`g oba`gfs ltkigmgad}xfs kl tkvxm`g haxa.

    4 DAOEGTKV@H KL M@XFT)@FX TKVXM@G A@H DKTHFT

    GAXFWA] ^TKXKOKCXbf M`xft`fx ok`smsxs kl a catgf

    `vidft kl `fxwktes oaccfh avxk`kikvs

    s}sxfis "A_-. Faob A_ ms assmg`fh a`

    A_

    Lmg. 1. M`xft`fx tkvxm`g a`h DG^

    ik`mxktm`g.

    `vidft a`h ok`xam s k`f kt ivcxm~cf

    hfsxm axmk` `fxwktes. Faob hfsxm`axmk`

    `fxwkte ms tf~tfsf`xfh d} a` M^ ahhtfss ~tflmr. Lkt frai~cf# xbf ~tflmr

    1?1.17=.=+48 tf~tfsf`xs a `fxwkte ax

    VOCA a`h ms ~atx kl A_ 64 "VOCAsA_ `vidft-. As kl Iatob 4>>#>>>

    avxk`kikvs s}sxfis a`h iktf xba`

    12>#>>> ~tflmrfs.

    A tkvxm`g ~tkxkokc ~tk~agaxfs xbfm`lktiaxmk` adkvx bkw xk tfaob acc xbf

    hfsxm`axmk`s xbtkvgbkvx xbf `fxwkte. A ~axb |foxkt ~tkxkokc oaccfh Dkthft

    Gaxfwa} ^tkxkokc "DG^- ms xbf hf laoxk

    tkvxm`g ~tkxkokc vsfh dfxwff`avxk`kikvs s}sxfis m` xbf M xft`fx

    xkha}. Tkvxm`g m`lktiaxmk` m` DG^ ms

    ~tk~agaxfh d} xbf froba`gf kl DG^

    v~haxf ifssagfs. A DG^ v~haxfifssagf ok`xam`s m`lktiaxmk` adkvx xbf

    hfsxm axmk` ~tflmr a`h xbf A_ ~axb vsfhxk tfaob xbax ~tflmr. Wf tf~tfsf`x a DG^v~haxf m` xbf lkti u"~tflmr-: A_)~axb-y.

    Lmg. 1 sbkws bkw DG^ v~haxfs

    ~tk~agaxf tkvxm`g m lktiaxmk` m` xbf

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    M`xft`fx. M` xbms lmgvtf# A_ 44 kw`s a

    ~tflmr ^1 a`h sf`hs a DG^ v~haxf

    ifssagf u^1:44y xk mxs `fmgbdkt A_ ??.A_ 44 ms samh xk df xbf ktmgm` A_ lkt

    ~tflmr ^1. K` tfofm|m`g xbms v~haxf# A_?? `kw ~tf~f`hs mxs kw` A_ `vidft xk

    xbf tfofm|fh ~axb a`h sf`hs xbf DG^v~haxf u^1:??#44y xk mxs `fmgbdkts# A_

    88 a`h A_ 66. A_ 66# m` xvt`# sf`hs xbf

    DG^ v~haxf u^1:66#??#44y xk mxs`fmgbdkt A_ 88. @kxf# A_ 88 tfofm|fs

    xwk ~axbs xk tfaob ^1. Wbf` a` A_

    tfofm|fs iktf xba` k`f ~axb xk tfaob a ~tflmr# mx obkksfs k`f kl xbfi as xbf

    ~tmiat} ~axb. M` Lmg. 1# wf assvif A_

    88 ~moes xbf ~axb u^1:??#44y dfoavsf mxms sbktxft. Gf`ftacc} s~faem g# xbms

    hfomsmk` k` wbmob ~axb xk ~moe ms dasfh

    k` xbf tkvxm`g ~kcmo} kl faob m`hm|mhvac

    A_. A` A_s tkvxm`g ~kcmo} acskhfxftim`fs wbfxbft xk sf`h a ~atxmovcat

    ~axb xk a `fmgbdkt. Dfsmhfs m`mxmac tkvxf

    ~tk~agaxmk`# ~b}smoac f|f`xs cmef cm`elamcvtfs oa` acsk xtmggft DG^ v~haxfs.

    Lkt frai~cf# assvif xbf cm e "88#??-

    gkfs hkw`. As as tfsvcx# A_ 88 swmxobfs

    xk a daoev~ ~axb u66#??#44y xbax mx bahcfat`fh fatcmft a`h sf`hs xbf DG^ v~haxf

    u^1:66#??#44y xk mxs `fmgbdkts.

    Xk ok`xtkc xbf `vidft kl DG^v~haxfs a`h xbvs tfhvof ~tkofssm`g k`

    tkvxfts# mx ms tfokiif`hfh xbax DG^

    tkvxfts sfx a DG^ xmift# oaccfh xbfIm`TkvxfAh|ft xmift# xk a |acvf kl ?>

    sfok`hs. Xbms xmift sfxs xbf im mivi

    xmif a tkvxft `ffhs xk wamx dflktfsf`hm`g DG^ v~haxfs xk mxs `fmgbdkt lkt

    xbf saif hfsxm`axmk`. M` kxbft wkths# m`xbf oasf adk|f# wbf` A_ ?? sf`hs xbfDG^ v~haxf l^1 : ??5 44g xk mxs

    `fmgbdkts# mx wkvch ba|f xk wamx ax cfasx

    ?> sfok`hs dflktf sf`hm`g a`kxbft

    v~haxf lkt xbf saif ~tflmr ^1.

    _m of DG^ v~haxfs ~tk~agaxftkvxm`g m lktiaxmk` m` xbf M`xft`fx#

    oa~xvtm`g xbf DG^ v~haxfs ax |atmkvs~atxs kl xbf M`xft`fx oa` gm|f vs vsflvc

    m`smgbx m`xk xbf sxaxf kl xbf M`xft`fx a`hxbf aikv`x kl tkvxm`g oba`gfs gkm`g k`

    m` xbf M xft fx. M` Lmg. 1# A_ 88 ms

    ok``foxfh xk a tkvxm g v~haxf okccfoxmk`dkr xbax tfofm|fs DG^ v~haxfs ltki A_

    88. Xbms okccfoxmk` dkr tf~tfsf`xs xbf

    haxa okccfoxkts kl DG^ ik`mxktm g~tkjfoxs svob as Tkvxf\mfws a`h TM^F .

    Wf oacc a` A_ ok``foxm g xk svob a

    okccfoxmk` dkr a` kdsft|axmk` ~km x.Xbfsf ik`mxktm g ~tkjfoxs okccfox DG^

    v~haxfs ltki |atmkvs kdsft|axmk` ~km`xs

    "k~ftaxmk`ac tkvxfts m` avxk`kikvs

    s}sxfis- atkv`h xbf gckdf a`h iaef xbfhaxa a|amcadcf xk xbf ~vdcmo. Xbms haxa

    oa` xbf` df vsfh d} `fxwkte k~ftaxkts

    a`h tfsfatobfts lkt |atmkvs xases svob astkvxm`g ~tkdcfi mhf`xmlmoaxmk` a`h

    hmag`ksxmos. Bkwf|ft# hvf xk xbf catgf

    smzf kl xbf M`xft`fx xk~kckg}# imccmk`s kl

    DG^ v~haxfs atf gf`ftaxfh f|ft}ha}#ok`xtmdvxm g xk xbf catgf |kcvif kl

    v~haxfs okccfoxfh d} Tkvxf \mfws a`h

    TM^F. M` xbf tfiam`hft kl xbms ~a~ft# wfsbkw bkw wf oa` |msvacmzf xbf tkvxm`g

    oba`gfs ok`|f}fh d} xbfsf imccmk`s kl

    DG^ v~haxfs.

    ? \M_VACMZAXMK@ HF_MG@Xbf lv`haif`xac kdjfoxm|f kl

    Cm e)Ta`e ms xk |msvacmzf tkvxm`g

    oba`gfs. A iajkt obaccf`gf wf laofh m`xbms tfgath ms soacf# m.f.# iktf xba`12>#>>> hfsxm`axmk`s a`h 4>#>>> A_

    `khfs. M` ahhmxmk`# k`f bas xk hfac wmxb

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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  • 8/6/2019 Visualizing Internet Routing Changes - IT

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    xbf catgf `vidft kl DG^ v~haxfs. Lkt

    frai~cf# k` 1 A~tmc 4>>#>>> v~haxfs ltki a sm`gcfkdsft|axmk` ~km`x# A_ 7>12. Xk hfac

    wmxb xbms mssvf kl soacf# m` Cm`e)Ta`e wfxaef xbf a~~tkaob kl wfmgbm`g cm`es d}

    tkvxfs oattmfh# tfgathcfss kl wbftf xbfhfsxm`axmk`s kl xbfsf tkvxfs atf. D}

    assmg`m`g xbfsf wfmgbxs# wf atf adcf xk

    |msvacc} tf~tfsf`x bfa|mc} vsfh cm`es m`xbf lkti kl Cm`e)Ta`e gta~bs as wfcc as

    oa~xvtf oba`gfs m` xbfsf wfmgbxs m` xbf

    lkti kl Ta`e oba`gf gta~bs hfsotmdfh m`_foxmk` ?.1.

    Cm`e)Ta`e vsfs a` m`~vx lmcxft xk

    ok`xtkc gf`ftaxmk` kl Ta`e)oba`gfgta~bs. M`~vx lmcxfts hfsotmdfh m` _foxmk`

    ?.4 oa` df xbtfsbkch)dasfh cmef

    ok`sxtvox Ta`e)oba`gf wbf` wfmgbx kl

    a cm e oba`gfs d} iktf xba` 6> ktsbkw oba`gfs kl tkvxfs k`c} xk s~fomlmo

    sfx kl ~tflmrfs. Xk ~tk|mhf a sviiat}

    kl xbf aikv`x kl tkvxm`g oba`gfs# m`_foxmk` ?.?# wf m`xtkhvof aoxm|mx} ~ckxs

    xbax sviiatmzf tkvxm`g aoxm|mx} k|ft

    xmif. Aoxm|mx} ~ckxs atf |ft} vsflvc

    sxatxm g ~km xs xk mhf xml} xbf xmif ~ftmkhs kl bmgb tkvxm`g h}`aimos.

    Lm acc}# k`f ia} wa x xk ok`xtkc xbf

    cf|fc kl xmif gta`vcatmx} xk kdsft|f tkvxfoba`gfs xbax casx ck`gft xba` a oftxam`

    aikv`x kl xmif. _vob gta`vcatmx} ok`xtkc

    oa` df aobmf|fh d} vsm`g xmif wm`hkwsa`h htmcc hkw` lfaxvtfs fr~cam fh m`

    _foxmk` ?.8.

    ?.1 Ta`e)Oba`gf Gta~b

    Xbf Cm e)Ta`e gta~b ltki a`kdsft|axmk` ~km`x wfmgbs a cm`e d} xbf`vidft kl tkvxfs vsm`g xbax cm`e. Xbms

    `kxmk` kl ta`em`g a cm`e wmxb `vidft kl

    tkvxfs xta`scaxfs xk xbf `aif

    "a- "d-

    Lmg. 4. Xbf `kxmk` kl cm`e wfmgbx.

    "a- Cm`e wfmgbx sff` d} 88."d- Cm`e wfmgbx sff` d} 88 alxft 66

    wmxbhtaws tkvxf xk ^?.

    Cm`e)Ta`e. M` xbf M`xft`fx# a sm`gcf A_

    oa``kx sff xbf oki~cfxf M`xft`fxxk~kckg} `kt oa` mx e`kw xbf tkvxfsxaef` d} acc xbf kxbft A_fs. Xbvs# xbf

    wfmgbx asskomaxfh wmxb xbf fhgf m` a

    Cm e)Ta`e gta~b ms tfcaxm|f xk xbfkdsft|axmk` ~km`x a`h hkfs `kx xfcc vs

    bkw ia`} xkxac tkvxfs m` xbf f`xmtf

    M`xft`fx vsf xbms cm e. Xk fr~cam xbms

    ok`of~x# wf vsf a smi~cf frai~cf sbkw`m` Lmg. 4. Xbms lmgvtf hf~moxs xbf tkvxm`g

    xadcf sff` d} a tkvxft m` A_ 88 m` Lmg. 1

    m` xbf lkti kl a gta~b. Bftf# wf assvifxbf frmsxf`of kl xwk iktf ~tflmrfs# ^4

    a`h ^?# a``kv`ofh d} A_ ?? a`h A_ 66#

    tfs~foxm|fc}. M` Lmg. 4"a- cm`e "88#??- basa wfmgbx kl 4# sm`of xbax cm`e a~~fats

    xwmof m` xbf tkvxm`g xadcf ax A_ 88. Wf

    hf`kxf xbf cm e wfmgbx d} wx""cm`e-#"kdsft|axmk`)~km`x-# f.g.# wx""88#??--#88- 9 4. Wf hflm f Cm e)Ta`e gta~b

    ltki a `khf as a gta~b sbkwm`g acc xbfcm`es ack`g wmxb wfmgbxs vsfh d} xbax

    `khf# cmef Lmg. 4"a-. @kxf xbax xbfhmtfoxmk` kl xbf cm`e ms mi~ktxa`x m` aCm e)Ta`e gta~b. Ml DG^ v~haxfs

    tfofm|fh ax A_ 88 oba`gf xbf tkvxm`g

    xadcf ax A_ 88# xbf Cm`e)Ta`e gta~b wmcc

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    acsk oba`gf. M` Lmg. 4"d-# A_ 66

    wmxbhtaws mxs tkvxf xk ^? a`h# as a tfsvcx

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    Ta`e gta~bs atf hmllmovcx xk |msvacmzf.

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    tfsvcx# m`sxfah kl ckkem`g ax xbf Cm`e)

    Ta`e gta~b alxft faob DG^ v~haxf# wf

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    oba`gf gta~bs oa~xvtf xbfsf cm`es wbksf

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    fhgfs xk iate cm es xbax ba|f gam fh

    tkvxfs. _mi~c} sxaxfh# gm|f` xwk Cm`e)Ta`e gta~bs ltki G1 a`h G4 ax

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    lmgvtf# k`f oa` ocfatc} sff xbax cm`e "88#

    66- cksx k`f tkvxf# wbmcf xbf cm`e "88#??-

    a`h "??#66- gam fh a tkvxf. @kxf# xbf

    Ta`e)oba`gf gta~b hkfs `kx sbkw cm`es

    xbax ba|f `kx gam`fh kt cksx tkvxfs# f.g.#cm`e "??# 44-. A Ta`e)oba`gf gta~b oa`

    fmxbft sbkw k`c} cm e wfmgbxs# k`c}wfmgbx oba`gfs kt dkxb. Lkt frai~cf#

    Lmg. ?a sbkws jvsx xbf wfmgbx oba`gfs#wbmcf Lmg. ?"d- sbkws xbf ovttf`x cm`e

    "a- "d-

    Lmg. ?. Ta`e)oba`gf gta~b lkt oba`gf m`Lmg. 4. "a- Ta`e oba`gfs k`c}.

    "d- Cm`e ta`e a`h ta`e oba`gf.

    Wfmgbx lkcckwfh d} xbf wfmgbx oba`gfm` ~atf`xbfsms.

    ?.1.1 @khfs# Fhgfs# a`h Okckt Okhm`g

    Wf `kw hmsovss skif hfxamcs kl

    |msvacmzaxmk` m` Ta`e)oba`gf gta~bs.

    Lmg. 8 sbkws a` aoxvac Ta`e)oba`gfgta~b ltki DG^ haxa. @kxf# xbf M`xft`fx

    bas iktf xba` 4>#>>> avxk`kikvs

    s}sxfis a`h# ovttf`xc}# k c} a lfwbv`htfh kdsft|axmk` ~km`xs atf

    ok``foxfh xk ~vdcmo haxa okccfoxkts.

    Kdsft|axmk` ~km`xs ltki wbftf k`f oa`kdsft|f tkvxm`g oba`gfs atf sbkw` as

    omtovcat `khfs xk hmllftf`xmaxf xbfi ltki

    tfoxa`gvcat `khfs xbax atf `kx

    kdsft|axmk` ~km`xs. \msvacc} sf~ataxm`g

    xbf kdsft|axmk` ~km xs ltki xbf kxbft`khfs ocfatc} bmgbcmgbxs kxbft ~kssmdcf

    |mfw~km xs xbax oa` df vsfh xk dfxxftv`hftsxa`h xbf saif xmif m`xft|ac. Xbf

    kdsft|axmk` ~km x kl xbf Ta`e)oba`gf

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    gta~b "A_

  • 8/6/2019 Visualizing Internet Routing Changes - IT

    7/16

    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    wfmgbx# as wfcc as xbf oba`gf m` wfmgbx#

    ms v~haxfh lkt acc cm`es allfoxfh d} faob

    DG^ v~haxf ifssagf. A Ta`e)oba`gfgta~b ms gf`ftaxfh wbf` xbf wfmgbx kl

    a`} cm`e oba`gfs d} iktf xba` a ~tfsfxxbtfsbkch "hflavcx ms 6>-.

    Vsm g xbf xbtfsbkch lmcxft wmxbDG^ v~haxfs# a sm`gcf tkvxm`g f|f`x ia}

    df dtkef` m`xk ivcxm~cf Ta`e)oba`gf

    gta~bs. Lkt frai~cf# assvif a cm e"A#D- lamcs a`h 6#>>> tkvxfs vsm`g xbax

    cm`e atf allfoxfh. Xbms wmcc tfsvcx m` a

    dvtsx kl 6#>>> DG^ v~haxfs ocksfc}s~aofh m` xmif# faob kl wbmob tfhvofs

    xbf ta`e kl xbf cm`e "A#D- d} 1. Xbvs xbf

    f`xmtf v~haxf dvtsx wkvch tfhvof xbfta`e kl "A#D- d} 6#>>>. Ml xbf xbtfsbkch

    lmcxft gf`ftaxfs a Ta`e)oba`gf gta~b

    faob xmif xbf cm`e wfmgbx oba`gfs d} 6>#

    xbftf wkvch df as ia`} as 1>> Ta`e)oba`gf gta~bs# faob wmxb a oba`gf kl 6>

    tkvxfs k` cm e "A#D-. Wf fi~ck}fh a

    xmim g ifoba msi xk tfhvof xbf `vidftkl Ta`e)oba`gf gta~bs hvf xk xbf saif

    f|f`x. Wf kdsft|fh xbax# d} hfca}m`g xbf

    ok`sxtvoxmk` kl xbf Ta`e)oba`gf gta~b

    d} a sbktx xmif# wf okvchsvi kl acc gam`f9%4>>

    svi kl acc ckssfs9)1>>

    Lmg. sfok`hs.

    Hvtm`g xbf f|f x xmift# ml tkvxm`goba`gfs ahh wfmgbx r xk a cm e a`h

    miifhmaxfc} oba`gf daoe xk tfhvof xbf

    wfmgbx k` xbax cm`e d} r# xbf `fx wfmgbx

    oba`gf wkvch df > "xftifhoki~f`saxm`g oba`gf- a`h# bf`of# `k

    Ta`e)oba`gf gta~b wmcc df gf`ftaxfh"sm of xbf wfmgbx oba`gf ms dfckw

    xbtfsbkch kl 6>-. Kvt obkmof kl ?>sfok`hs lkt xbf f|f`x xmift was

    ikxm|axfh d} xbf DG^ xmift oaccfh xbf

    Im TkvxfAh|ft xmift# fr~cam fh m`_foxmk` 4. Wmxb xbf Im TkvxfAh|ft

    xmift sfx xk xbf tfokiif`hfh xmif kl ?>

    sfok`hs# oki~f saxm`g oba`gfs oa``kxba~~f` ax a ltfqvf`o} cfss xba` ?>

    sfok`hs. Xbkvgb `kx acc tkvxfts m` xbf

    M`xft`fx atf e`kw` xk vsf xbf ITAMxmift# wf lkv`h xbf f|f`x xmift |acvf kl

    ?> sfok`hs xk df ahfqvaxf.

    Xbf gta~b gf`ftaxkt oki~k`f`x

    kvx~vxs xbf Ta`eoba`gf gta~b dasfh k`xbf v~haxfs lfh xk mx d} xbf m`~vx lmcxft.

    Xbf kvx~vx lmcxft oa` ok xtkc xbf cm`es

    a`h `khfs m` xbf Ta`e)oba`gf gta~b lktdtf|mx}. Lmcxft tvcfs lkt xbf kvx~vx okvch

    df smi~cf wfmgbx)dasfh tvcfs# svob as

    tfik|f acc cm`es dfckw a oba`gf kl 1>#

    kt iktf oki~cfr# svob as sbkw gta~bswmxb ax cfasx k`f kl xbf `khfs ??2# 66

    A@H cm`es 88 ??. Xbf kvx~vx lmcxft

    ms ~atx kl xbf |msvacmzaxmk` xkkc# a`h# dasfh k` gta~b oki~cfrmx}# k`f oa`

    h}`aimoacc} vsf lmcxft tvcfs xk smi~cml}

    xbf gta~bs. _viiatmzm`g# xbf m`~vx lmcxft ~tf~atfs xbf haxa lkt Ta`e)oba`gf

    gta~bs a`h xbf kvx~vx lmcxft oa` df vsfh

    xk ~tv`f xbf Ta`e)oba`gf gta~b lvtxbft.

    ?.? Aoxm|mx} ^ckxs: _viiatmzm`g

    Wfmgbx Oba`gfs

    Aoxm|mx} ~ckxs sviiatmzf tkvxm`g

    oba`gfs tf~tfsf`xfh d} Ta`e)oba`gf

    gta~bs ack`g xbf xmif hmif`smk`. A`aoxm|mx} ~ckx ms a sftmfs kl tfh a`h gtff`

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    dats k` acxft`axf smhfs kl a bktmzk`xac

    arms kl xmif. Wmxb a` aoxm|mx} ~ckx# a vsft

    oa` mhf`xml} xmif ~ftmkhs kl bmgb tkvxm`gaoxm|mx} a`h xbf` m`|fsxmgaxf xbksf

    s~fomlmo ~ftmkhs m` iktf hfxamc. Wf lmtsxfr~cam bkw a sm gcf aoxm|mx} dat ms

    ~ckxxfh. Lmg. < sbkws a Ta`e)oba`gfgta~b smimcat xk Lmg. 4. Gm|f` a Ta`e)

    oba`gf gta~b# wf lmtsx lm`h xbf xkxac gam`

    a`h xkxac ckss d} ahhm g xbf wfmgbxoba`gfs kl xbf gtff` a`h tfh cm es#

    tfs~foxm|fc}. M` xbms oasf# xbf xkxac ta`e

    gam` ms 4>> "1>> faob k` cm`es "88#??-a`h "??#66-- a`h xbf xkxac ta`e ckss ms

    1>>. Wf ~ckx tfh a`h gtff` dats

    ~tk~ktxmk`ac xk xbf xkxac ckss a`h gam`#tfs~foxm|fc}# as sbkw` m` Lmg.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    ?.8 Xmif Wm`hkws a`h Htmccm`g Hkw`

    Xbf xmif wm`hkw ok`xtkc m`

    Cm`e)Ta`e acckws vsfts xk aggtfgaxfTa`e)oba`gf gta~bs m` a xmif m`xft|ac.

    Hvf xk xbf ~tfsf`of kl sckwok`|ftgf`of# skif sbktx)cm|fh m`|acmh

    ~axbs okvch a~~fat as gf`vm`f tkvxfoba`gfs. Wmxb xbf xmif)wm`hkw ok`xtkc#

    k`f oa` m`otfasf kt hfotfasf xbf

    ck`gf|mx} kl wfmgbx oba`gfs xbax k`fwa`xs xk |msvacmzf. Lmg. 7"a- sbkws xbtff

    aoxm|mx} dats okttfs~k`hm`g

    Lmg. 2. Htmccm`g hkw` xk m`otfasf xbf

    cf|fc kl hfxamc m` aoxm|mx}.

    Xk xbtff Ta`e)oba`gf gta~bs sbkw`

    dfckw. M` Lmg. 7d# wf sbkw xbf xmifwm`hkw d} tfoxa`gvcat dkrfs k` xbf

    aoxm|mx} ~ckx. Xbms xmif wm`hkw oa` scmhf

    ack`g xbf aoxm|mx} gta~b vsm`g H\H

    ~ca}daoe)cmef ok`xtkcs. M` Lmg. 7d# wfsbkw bkw xbf Ta`eoba`gf gta~b ckkes

    m` xbtff oasfs# xwk m`|kc|m`g xbf saif

    xmif wm`hkw smzf dvx hmllftf`x ~ksmxmk`s#a`h k`f m`|kc|m`g a` f|f` wmhft xmif

    wm`hkw smzf. Ax faob ~ksmxmk` kl xbf

    xmif wm`hkw# xbf Ta`e)oba`gf gta~bslaccm`g m` xbax wm`hkw atf okidm`fh m`xk

    k`f d} xaem`g xbf v`mk` kl acc xbf Ta`e)

    oba`gf gta~bs. Fqvm|acf`xc}# xbf Ta`e)

    oba`gf gta~b lkt a s~fomlmo ~ksmxmk` kl

    xbf xmif wm`hkw oa` acsk df ok`sxtvoxfh

    as a hmllftf`of gta~b dfxwff` xbf Cm`e)Ta`e gta~bs ax xbf sxatx a`h f`h kl xbf

    xmif wm`hkw. @kxf xbax# wmxbm` xbf lmtsxxmif wm`hkw x1# xbf Ta`e)oba`gf gta~bs

    ba|f skif oa`ofccaxmk` fllfox kl tkvxfoba`gfs# m.f.# xbf `fx wfmgbx oba`gf kl

    "88#66- ms ) 1>> % 6> 9 ) 6>. M` ok`xtasx#

    wmxbm` xbf sfok`h xmif wm`hkw x4# xbfTa`e)oba`gf gta~bs ba|f a` ahhmxm|f

    fllfox# m.f.# xbf wfmgbx oba`gf kl "88# 66-

    ms 6> % 6> 9 1>>. Ml xbf xmif wm`hkw msm`otfasfh xk m`ocvhf acc xbtff aoxm|mx}

    dats as m` x?# xbf` acc xbf oba`gfs wmcc df

    oa`ofcfh a`h xbf `fx Ta`e)oba`gf gta~bwmcc df fi~x}.

    A`kxbft xmif ok`xtkc# oaccfh xbf

    htmcc)hkw` lfaxvtf# acckws k`f xk ok`xtkc

    xbf xmif gta`vcatmx} kl xbf f`xmtf aoxm|mx}~ckx. D} htmccm`g hkw`# k`f oa` fr~a`h

    xbf aoxm|mx} m`smhf xbf ovttf`x xmif)

    wm`hkw xk a catgft xmif)s~a` m` a `fwwm`hkw. Xbf lmtsx ~atx kl Lmg. 2 sbkws

    a` aoxm|mx} ~ckx s~a``m`g k|ft fmgbx ha}s

    a`h xmif wm`hkw kl 1< bkvts. Xk dfxxft

    v`hftsxa`h xbf aoxm|mx} m`smhf xbf xmifwm`hkw# wf htmcc hkw` xk fr~a`h xbf 1#>>> `khfs.Bkwf|ft# xbf smzf kl xbf Ta`e)oba`gf

    gta~b hf~f`hs k` xbf `vidft kl cm`eswbksf wfmgbxs ba|f oba`gfh a`h xbf

    iag`mxvhf kl oba`gfs. Bf`of# m` skif

    oasfs wbftf a siacc `vidft kl cm esba|f wfmgbx oba`gfs# xbf Ta`e)oba`gf

    gta~bs ia} ok`xam` k`c} a siacc `vidft

    kl `khfs a`h cm`es. M` kxbft oasfs wmxb ackx kl oba`gfs# xbf Ta`e)oba`gf gta~b

    Lmg. =. Assfidcm g |mfws ltki A_

    112 a`h A_ ?6 tkvxfts dfck`gm`g xk hmllftf`x

    avxk`kikvs s}sxfis. M` kthft xkv`hftsxa`h bkw `fxwkte k~ftaxkts

    hmag`ksf ~tkdcfis# wf m`xftaoxfh wmxb

    `fxwkte ahim`msxtaxkts xbtkvgb fiamca`h ~ftsk`ac m`xft|mfws ax |atmkvs @ktxb

    Aiftmoa` @fxwkte K~ftaxkt Gtkv~

    iffxm`gs. Kvt ~kkc kl m xft|mfwffs

    ok`smsxfh kl adkvx 8> k~ftaxkts ltkidkxb siacc a`h dmg M_^s# wmxb iksx kl

    xbfi ba|m`g iktf xba` lm|f }fats kl

    fr~ftmf`of m` `fxwkte k~ftaxmk`s. M` xbftfsx kl xbms sfoxmk`# wf vsf xbf

    e`kwcfhgf gam`fh ltki xbms m`xftaoxmk`

    xk a`ac}zf xbtff oasf sxvhmfs ltki xbf~fts~foxm|f kl a` k~ftaxkt vsm`g Cm`e)

    Ta`e.

    Wf vsfh xbtff wa}s xk sfcfoxkdsft|axmk` ~km`xs a`h xmif ~ftmkhs lkt

    oasf sxvhmfs. Lmtsx# wf ckkefh ax aoxm|mx}~ckxs ltki acc kdsft|axmk` ~km xs k` awffec} dasms a`h mhf`xmlmfh xbf ~ftmkhs

    wmxb hf`sf aoxm|mx} kt s~mefs. Oasf M ms

    a` frai~cf kl xbms# wbftf wf saw bfa|}

    ^cfasf sf`h }kvt lffhdaoe xk ~tkjfoxswktchNcm|f.oki a`h sf`h iktf~tkjfoxs xk vs a`h wf v~ckah mx xk www.~tkjfoxswktchs.dckgs~kx.okia`h }kv oa` sbatf xbf ~tkjfoxs a`h bfc~ kxbft xk ~atxmom~axf.

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  • 8/6/2019 Visualizing Internet Routing Changes - IT

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    aoxm|mx} ltki a ~atxmovcat kdsft|axmk`

    ~km x. _fok`h# wf ckkefh ax aoxm|mx}

    ~ckxs xk lm h aoxm|mx} s~mefs aotkssivcxm~cf kdsft|axmk` ~km xs hvtm`g xbf

    saif xmif ~ftmkh. Oasf MM ms a` frai~cfwbftf aoxm|mx} ~ckxs ltki ivcxm~cf

    kdsft|axmk` ~km`xs sbkw s~mefs ax atkv`hxbf saif xmif. Oasfs M a`h MM sbkw xbax

    aoxm|mx} ~ckxs oa` sft|f as sviiatmfs lkt

    `fxwkte k~ftaxkts vsm`g Cm`e)Ta`e.Lm`acc}# wf ~moefh oasf sxvhmfs m`

    tfs~k`sf xk tf~ktxs kl tkvxm`g kt xtallmo

    ~tkdcfis ltki frxft`ac skvtofs svob as@ktxb Aiftmoa` @fxwkte K~ftaxkts

    Gtkv~ "@A@KG- iamcm`g cmsxs. Oasf MMM

    ms tf~tfsf`xaxm|f kl xbms oaxfgkt}# wbftfxbftf wftf tf~ktxs kl xtallmo ~tkdcfis

    ltki a lfw M_^s. M` faob kl xbfsf oasfs#

    Lmg. 1>. Aoxm|mx} ~ckxs ltki 2 Iatob4>>6 xk 18 Iatob 4>>6.

    wf vsfh xbf Ta`e)oba`gf gta~bs hvtm`g

    xbf sfcfoxfh xmif ~ftmkhs a`h# m` k`f

    oasf# assfidcfh ivcxm~cf |mfws xkgfxbft#xk v`hftsxa`h xbf tkvxm`g aoxm|mx}.

    8.4 Oasf M: Oa~xvtm`g Cm`e

    M`sxadmcmxmfs

    Atkv`h Iatob 4>>6# A_ 7>12

    sbkwfh a ckx kl bfa|} aoxm|mx}# as sbkw`m` xbf sfok`h aoxm|mx} ~ckx "tkvxft M^14.>.1.

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    www.~tkjfoxswktchs.dckgs~kx.oki

    www.~tkjfoxswktchs.dckgs~kx.oki ~tk|mhfs acc ~tkjfoxs lkt Acc _xvhf`xs

    ]fx# xbf} klxf` gk v``kxmofh. M` xbms

    oasf# xbf dfba|mkt ok`xm`vfh lkt aciksx

    xbtff wffes m` Iatob 4>>6# ok`xtmdvxm`gbv`htfhs kl xbkvsa`hs kl DG^ v~haxfs

    sff` ax xbf kdsft|axmk` ~km`x. A `fxwktek~ftaxkt vsm g Cm`e)Ta`e ax A_ 7>12

    wkvch df`flmx ltki xbf qvmoemhf`xmlmoaxmk` kl svob ksomccaxmk`s a`h

    dtm`g sxadmcmx} xk tkvxfs as wfcc as tfhvof

    xbf `vidft kl DG^ v~haxfs m` xbfM`xft`fx htasxmoacc}. M` kvt fraim`axmk`

    k|ft kxbft xmif ~ftmkhs# wf lkv`h qvmxf a

    lfw m`sxa`ofs kl cm`e m`sxadmcmxmfs smimcatxk xbms oasf adk|f.

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