{"id":4249,"date":"2020-10-30T20:12:17","date_gmt":"2020-10-30T19:12:17","guid":{"rendered":"https:\/\/webhosting.de\/firewall-2\/"},"modified":"2020-10-30T20:12:17","modified_gmt":"2020-10-30T19:12:17","slug":"firewall-2","status":"publish","type":"post","link":"https:\/\/webhosting.de\/da\/firewall-2\/","title":{"rendered":"Firewall"},"content":{"rendered":"

Under betegnelsen Firewall<\/a> En firewall er en beskyttelsesv\u00e6g, der beskytter computere, gateway-servere og tilh\u00f8rende netv\u00e6rksudstyr mod angreb udefra. Som en \"firewall\" fungerer firewall'en som en logisk testanordning, der beskytter et privat netv\u00e6rk mod det offentlige netv\u00e6rk. Hvis firewall'en ikke fandtes, ville private computere og netv\u00e6rk v\u00e6re forsvarsl\u00f8se over for de mange angreb udefra. Firewallen er ikke et virusbeskyttelsesprogram. Dens funktion er ikke at opdage angreb. Den er snarere designet til konsekvent at gennemf\u00f8re regler for netv\u00e6rkskommunikation. Alle indg\u00e5ende datapakker unders\u00f8ges i henhold til firewallreglerne, og de ususpekte pakker f\u00e5r lov til at passere. Du modtager en meddelelse, n\u00e5r der modtages tvivlsomme datapakker. Du bestemmer selv. Firewallen kan med sine mange funktioner utvivlsomt beskrives som et vigtigt modul i et it-sikkerhedskoncept.<\/p>\n

Firewall: overv\u00e5gning i henhold til definerede regler<\/p>\n

Grundl\u00e6ggende er enhver firewall baseret p\u00e5 software, der kan kontrollere datastr\u00f8mme mellem en computer og firewallen. Internet<\/a> kontrolleret. Denne overv\u00e5gning er baseret p\u00e5 et s\u00e6t regler, der er skrevet ind i softwaren. Firewall-l\u00f8sningen f\u00f8lger specifikke retningslinjer. Baseret p\u00e5 de lagrede regler beslutter firewallen, om en indg\u00e5ende netv\u00e6rkspakke i l\u00f8bet af datatrafikken skal vinkes igennem eller afvises. Denne simple indg\u00e5ende kontrol fors\u00f8ger at afv\u00e6rge u\u00f8nskede netv\u00e6rksindtr\u00e6ngere. Disse kontrolmekanismer kontrollerer b\u00e5de den datastr\u00f8m, der kommer ind fra internettet, og den datastr\u00f8m, der g\u00e5r til internettet. Firewallen baserer denne kontrolscanning p\u00e5 de karakteristiske tr\u00e6k ved hver datapakke. Det omfatter afsenderadresse, destinationsadresse og oplysninger om de anvendte tjenester, dvs. datapakkens type.
\nI l\u00f8bet af datascanningen kan firewallen kontrollere hver enkelt adgangsanmodning. Denne kontrol omfatter analysen, dvs. fastl\u00e6ggelse af identiteten af den anmodende tjeneste. Dette sikrer, at den anmodende part har et registreret dom\u00e6nenavn og dermed en gemt internetadresse. En anden firewallkontrolprocedure best\u00e5r af en fuldst\u00e6ndig kontrol af den indkommende datapakke sammen med en krydskontrol af s\u00e5danne koder, som er opf\u00f8rt p\u00e5 en gemt \"sortliste\".
\nFor at opsummere firewallens funktionalitet pr\u00e6senterer den sig selv som et datapakkefilter. Firewallen beskytter dig og din computer ved at vise, hvad der sendes og modtages via din internetforbindelse. Hvis firewallen identificerer problematiske datapakker, sendes der en meddelelse. Du beslutter, om den Data<\/a> kan eller kan ikke passere gennem din firewall.
\nHvis der er behov for at registrere angreb ud over firewallens pakkefilterfunktion, anvendes yderligere IDS-moduler (IDS = Intrusion Detection System). IDS'et kan supplere firewallen, men det kan ogs\u00e5 ligge direkte p\u00e5 den computer, der skal overv\u00e5ges, og \u00f8ge netv\u00e6rkssikkerheden derfra.<\/p>\n

To firewall-modeller: desktop og netv\u00e6rk<\/p>\n

Der findes to firewallmodeller p\u00e5 markedet for informationsteknologi (IT). Den mere komplekse firewall-l\u00f8sning findes i netv\u00e6rk, f.eks. i et virksomhedsnetv\u00e6rk. Her overtager en separat computer, som er tilsluttet mellem pc'erne og internettet via routeren, firewallopgaverne for alle pc-arbejdsstationer, der er tilsluttet i netv\u00e6rket. En proxyserver (proxy = repr\u00e6sentant) er normalt allerede integreret i en firewall. Denne proxyserver overtager kommunikationen til m\u00e5lsystemet og sikrer s\u00e5ledes den \u00f8nskede anonymitet i dette tilf\u00e6lde. Denne firewallhardwarel\u00f8sning er omkostningseffektiv i et netv\u00e6rk. <\/p>\n

P\u00e5 dit hjemmekontor er den softwarel\u00f8sning, der er tilg\u00e6ngelig som et alternativ til hardwarefirewallen til den station\u00e6re computer - pc'en - det vigtigste m\u00e5l for alting. I \"Windows\"-operativsystemer er firewallen en del af standardleveringen. For at sikre beskyttelse skal firewallen v\u00e6re aktiveret i \"sikkerhedsindstillingerne\". Via brugergr\u00e6nsefladen kan sikkerhedskriterierne og deres t\u00e6rskelv\u00e6rdier defineres p\u00e5 en brugerorienteret m\u00e5de og vises p\u00e5 en grafisk brugergr\u00e6nseflade. <\/p>\n

Firewall - et uundv\u00e6rligt sikkerhedsmodul<\/p>\n

Konklusion: Firewall-l\u00f8sninger er et element\u00e6rt modul i et it-sikkerhedskoncept. Funktionaliteten omfatter rapporter og protokoller samt udl\u00f8ste alarmer baseret p\u00e5 logiske testkriterier, der automatisk udl\u00f8ses, n\u00e5r frit definerbare t\u00e6rskelv\u00e6rdier n\u00e5s. Gr\u00e6nsefladen mellem dig som operat\u00f8r og firewallen er en grafisk brugergr\u00e6nseflade.<\/p>","protected":false},"excerpt":{"rendered":"

Unter der Bezeichnung Firewall versteht man einen Schutzwall, der Computer, Gateway-Server und dazu geh\u00f6rende Netzwerk-Einrichtungen vor externen Angriffen sch\u00fctzen soll. Wie eine „Brandschutzmauer“ (engl.: firewall) fungiert die Firewall als logische Pr\u00fcfeinrichtung die ein privates Netz vor dem \u00f6ffentlichen Netz sch\u00fctzt. W\u00e4re die Firewall nicht existent, so w\u00e4ren private Computer und Netzwerke den vielf\u00e4ltigen Attacken von 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