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This post describes techniques that utilize ACLs, maps, and stick tables. See the following posts for introductions to those topics: Application-layer DDoS attacks are aimed at overwhelming an application with requests or connections, and in this post we will show you how an HAProxy load balancer can protect you from this threat.
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#CENTOS FIX SLOWLORIS ATTACK WINDOWS#
22ĭoS, DDoS, Windows Server 2019, Ubuntu 19.10, CentOS 8, Slowloris, hping3, UDP flood, Slow HTTPĭoS, DDoS, Windows Server 2019, Ubuntu 19.10, CentOS 8, Slowloris, hping3, UDP flood, Slow HTTP National CategoryĮlectrical Engineering, Electronic Engineering, Information Engineering Identifiers URN: urn:nbn:se:hv:diva-15245 Local ID: EXN300 OAI: oai:DiVA.HAProxy’s high-performance security capabilities are utilized as a key line of defense by many of the world’s top enterprises. Place, publisher, year, edition, pages2020. The Ubuntu server performed the best when looking at the CPU and memory usage, with little to no change from its baseline results and a higher uptime of its webpage than the Windows server.ĬentOS recorded less of a change in hardware performance when being attacked than the Windows server but more so than the Ubuntu server, it was, however, the server with the most uptime of the webpage when being attacked. During the Slow HTTP attacks the web servers were checked for availability, if it was not available then the attack was successful.ĭuring testing it was found that the Windows server had the worst performance during both attacks, showing the highest increase in hardware usage and the lowest uptime of the web page when being attacked. The servers' average CPU usage and average memory usage were measured, these results were then compared and if any increase had occurred during the attack it would be deduced that the attack was impacting the server negatively, a higher increase meant a higher impact.
#CENTOS FIX SLOWLORIS ATTACK SOFTWARE#
The three Operating systems in question were Windows Server 2019, Ubuntu Server 19.10 and CentOS 8 Server, they all had the web server software Apache installed. Results were recorded both before and during the attacks, to then be compared. The first round of attacks was performed by one computer and the second round was performed by four computers simultaneously, this was to simulate DoS attacks and distributed denial-of-service (DDoS) attacks respectively. Computers running Kali Linux were used as the attackers and the tools hping3 and Slowloris were used to perform the attacks. Three different servers running three different server operating systems were subjected to the denial-of-service (DoS) attacks UDP flood and Slow HTTP. Ubuntu-servern presterade bäst när man tittade på CPU- och minnesanvändning, med liten eller ingen förändring från dess basresultat och en högre drifttid för webbsidan än Windows-servern.ĬentOS registrerade en mindre förändring i hårdvaruprestandan när den attackerades än Windows-servern men mer än Ubuntu-servern, det var dock servern med längst drifttid när webbsidan attackerades. Under testen konstaterades det att Windows-servern hade den sämsta prestanda under båda attackerna, vilket visade den högsta ökningen av hårdvaruanvändning och den lägsta drifttiden på webbsidan när den attackerades. Under de långsamma HTTP-attackerna kontrollerades webbservrarna för tillgänglighet, om dessa inte var tillgängliga var attacken framgångsrik.
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Dessa resultat jämfördes sedan och om någon ökning hade inträffat under attacken betydde det att attacken påverkade servern negativt, en högre ökning innebar en högre effekt. Serverns genomsnittliga CPU-användning och genomsnittliga minnesanvändning mättes. De tre operativsystemen i fråga var Windows Server 2019, Ubuntu Server 19.10 och CentOS 8 Server vilka alla hade Apache webbserverprogramvara installerad. Resultaten samlades in både innan och under attackerna för att sedan jämföras. Den första attackrundan utfördes av en dator och den andra omgången utfördes av fyra datorer samtidigt, detta var för att simulera DoS-attacker och distribuerade denial-of-service (DDoS). Datorer som kör Kali Linux användes som angripare, samt verktygen hping3 och Slowloris användes för att utföra attackerna. Tre olika servrar vilka kör tre olika serveroperativsystem utsattes för denial-of-service (DoS) attackerna UDP-översvämning och långsam HTTP. Företagsservers operativsystemprestanda under DoS och långsam DoS-attacker (Swedish)