Ma Troja amagwiritsidwa ntchito poyambitsa kugawidwa kwa Distributed Denial of Service (DDoS) motsutsana ndi zida zowonongeka, koma kodi DDoS akuukira ndi chiyani?
Pachifukwa chake chachikulu, kusokonezeka kwa Distributed Denial of Service (DDoS) kumapangitsa kuti pakhale ndondomekoyi, kuti yankho likuchokera pang'onopang'ono kapena laima. Kuti apange kuchuluka kwa magalimoto, malo ogwiritsira ntchito zombie kapena makompyuta amagwiritsidwa ntchito nthawi zambiri.
Zombies kapena botnets ndi makompyuta omwe asokonezedwa ndi otsutsa, makamaka pogwiritsira ntchito Trojans, kulola machitidwewa osokonezeka kuti aziyendetsedwa kutali. Pamodzi, machitidwewa akugwiritsidwa ntchito kuti apangitse kuthamanga kwapamwamba kofunikira kuti awononge DDoS.
Kugwiritsiridwa ntchito kwa mabotolowa nthawi zambiri kumagulitsidwa ndi kugulitsidwa pakati pa otsutsa, motero dongosolo losokonezeka lingakhale pansi pa olamulira ambiri - aliyense ali ndi cholinga chosiyana mu malingaliro. Otsutsa ena angagwiritse ntchito botnet ngati spam-relay, ena kukhala ngati tsamba lothandizira kwa code zoipa, ena kulandira zowononga phishing, ndi ena pa DDoS kutchulidwa.
Njira zingapo zingagwiritsidwe ntchito poyambitsa kusokonezeka kwa kugawidwa kwa utumiki. Zambiri mwazofala ndi HTTP PEZANI zofufuzidwa ndi SYN. Chimodzi mwa zitsanzo zolemekezeka kwambiri za HTTP GET zowonongeka zinali kuchokera ku nyongolotsi ya MyDoom, yomwe inalumikiza webusaiti ya SCO.com. Kugonjetsa kwa GET kumagwira ntchito monga momwe dzina lake limasonyezera - limatumiza pempho la tsamba lapadera (kawirikawiri tsamba loyamba) ku seva lolunjika. Pankhani ya nyongolotsi ya MyDoom , zopempha 64 zinatumizidwa mphindi iliyonse kuchokera ku njira iliyonse ya kachilomboka. Ndi makompyuta masauzande ambiri omwe amawerengedwa kuti ali ndi kachilombo ka MyDoom, kufulumira kunayesa mwamphamvu kwambiri ku SCO.com, kugogoda kwachinsinsi kwa masiku angapo.
Chigumula cha SYN kwenikweni chimagwirana chanza. Kuyankhulana kwa intaneti kumagwiritsanso ntchito katatu. Wothandizira otsogolera amayamba ndi SYN, seva imayankha ndi SYN-ACK, ndipo kasitomala amayenera kuyankha ndi ACK. Pogwiritsa ntchito ma adresse a IP, munthu wotsutsa amamutumiza SYN yomwe imapangitsa SYN-ACK kutumizidwa ku adiresi yomwe siidapemphe Seva ikudikira kuti yankho la ACK likhale lopanda pake. Pamene ziwerengero zazikuluzikulu za SYN zimasokonezedwa, zowonjezera seva zatha ndipo seva imakhudzidwa ndi DDoS ya SYN.
Mitundu yambiri ya zida za DDoS zingayambidwe, kuphatikizapo UDP Fragment Attacks, Floods ya ICMP, ndi Ping of Death. Kuti mudziwe zambiri zokhudza mitundu ya DDoS, pitani ku Advanced Networking Management Lab (ANML) ndikuyang'aniranso Zowonjezera Zowonongeka Zowonongeka kwa Utumiki (DDoS) Resources.
Onaninso: Kodi PC yanu ndi zombie?