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In a captive portal, the firewall will make sure that only the DNS server(s) provided by the network's DHCP can be used by unauthenticated clients (or, alternatively, it will forward all DNS requests by unauthenticated clients to that DNS server). This DNS server will return the IP address of the captive portal page as a result of all DNS lookups.
A captive portal intercepts HTTP access to web pages, redirecting users to a web application that provides instructions and tools for updating their computer. Until their computer passes automated inspection, no network usage besides the captive portal is allowed.
Even the most basic VBN gateways provide DHCP and Proxy ARP to allow users to connect to the network with no IP address configuration required. A captive portal is used for a variety of functions including, billing or authentication and acceptance of terms and conditions.
One of the most commonly used attacks under evil twins is a captive portal. At first, the attacker would create a fake wireless access point that has a similar ESSID to the legitimate access point. The attacker then might execute a denial-of-service attack on the legitimate access point which will cause it to go offline. From then on, clients ...
DNS hijacking, DNS poisoning, or DNS redirection is the practice of subverting the resolution of Domain Name System (DNS) queries. [1] This can be achieved by malware that overrides a computer's TCP/IP configuration to point at a rogue DNS server under the control of an attacker, or through modifying the behaviour of a trusted DNS server so that it does not comply with internet standards.
OPNsense has a web-based interface and can be used on the x86-64 platform. [5] Along with acting as a firewall, it has traffic shaping, load balancing, captive portal and virtual private network capabilities, and others can be added via plugins.
The above translates into different implementations for different uses. Here are some examples. An Internet service provider which provides network access via common modem or modem-like devices (be it PSTN, DSL, cable or GPRS/UMTS) can have one or more NAS (network access server) devices which accept PPP, PPPoE or PPTP connections, checking credentials and recording accounting data via back ...
The WiFiDog authentication server is a PHP and PostgreSQL or MySQL server based solution written to authenticate clients in a captive portal environment. WiFiDog Auth provides portal specific content management, allows users to create wireless internet access accounts using email access, provides gateway uptime statistics and connection specific and user log statistics.