Sf state gateway The `sf_state` gateway is a component of pfSense, an open-source firewall and router distribution based on FreeBSD. The pfSense software includes a variety of features, such as a web interface for configuration, traffic shaping, and a VPN server and client. The `sf_state` gateway, however, is specifically responsible for stateful inspection and tracking. Stateful inspection involves examining the packets in a connection and using this information to create a state table. This table contains information about the state of each connection, such as the source and destination IP addresses, the source and destination ports, and the current state of the connection (e.g., established, closed, or closing). When a new packet arrives, the firewall checks the state table to determine whether the packet is part of an existing connection or a new connection. If the packet is part of an existing connection, the firewall allows it to pass through; if it is a new connection, the firewall decides whether to allow or block it based on the configured rules. The `sf_state` gateway supports several different types of states, including: * `SYN_SENT`: The initial connection request has been sent, but no response has been received yet. * `SYN_RECV`: A connection request has been received, and the firewall has sent a response. * `ESTABLISHED`: The connection has been established and is active. Day 1: Current Day * `TIME_WAIT`: The firewall has acknowledged the closure of the connection and is waiting for any remaining packets to be processed before fully closing the connection. The `sf_state` gateway also supports several different types of stateful inspection options, including: * `no state`: Disables stateful inspection for the rule. * `keep state`: Enables stateful inspection and creates a state table entry for the connection. * `syn proxy state`: Enables stateful inspection and creates a state table entry for the connection, but also acts as a proxy for the initial connection request. This helps protect against TCP SYN flood attacks. * `sloppy state`: Enables stateful inspection and creates a state table entry for the connection, but allows some flexibility in the matching of packets to the state table. This can help avoid false positives in certain situations. The `sf_state` gateway supports several different types of states, including: * `SYN_SENT`: The initial connection request has been sent, but no response has been received yet. * `SYN_RECV`: A connection request has been received, and the firewall has sent a response. * `ESTABLISHED`: The connection has been established and is active. * `CLOSE_WAIT`: The application has requested that the connection be closed, but the firewall has not yet received a response from the remote host. * `FIN_WAIT_1`: The application has requested that the connection be closed, and the firewall has sent a request to the remote host to close the connection. * `FIN_WAIT_2`: The firewall has received a response from the remote host indicating that it will close the connection. * `CLOSING`: Both the firewall and the remote host have requested that the connection be closed, but the connection has not yet been fully closed.
Gwinnett County also offers AP Capstone, a two-year program that allows students to develop research, collaboration, and communication skills. The AP Capstone program consists of two courses: AP Seminar and AP Research. Students who complete the AP Capstone program and earn scores of 3 or higher on the AP Seminar and AP Research exams can earn the AP Capstone Diploma.