31,703
edits
Template:Networking rutos manual firewall: Difference between revisions
Template:Networking rutos manual firewall (view source)
Revision as of 10:52, 19 August 2020
, 19 August 2020→Attack Prevention
No edit summary |
|||
| Line 741: | Line 741: | ||
<b>SYN Flood Protection</b> allows you to protect yourself from attacks that exploit part of the normal TCP three-way handshake to consume resources on the targeted server and render it unresponsive. Essentially, with SYN flood DDOS, the offender sends TCP connection requests faster than the targeted machine can process them, causing network over-saturation. | <b>SYN Flood Protection</b> allows you to protect yourself from attacks that exploit part of the normal TCP three-way handshake to consume resources on the targeted server and render it unresponsive. Essentially, with SYN flood DDOS, the offender sends TCP connection requests faster than the targeted machine can process them, causing network over-saturation. | ||
[[File: | [[File:Networking_rutos_manual_firewall_attack_prevention_syn_flood_protection.png|border|class=tlt-border]] | ||
<table class="nd-mantable"> | <table class="nd-mantable"> | ||
| Line 775: | Line 775: | ||
Some attackers use <b>ICMP echo request</b> packets directed to IP broadcast addresses from remote locations to generate denial-of-service attacks. You can set up some custom restrictions to help protect your router from ICMP bursts. | Some attackers use <b>ICMP echo request</b> packets directed to IP broadcast addresses from remote locations to generate denial-of-service attacks. You can set up some custom restrictions to help protect your router from ICMP bursts. | ||
[[File: | [[File:Networking_rutos_manual_firewall_attack_prevention_remote_icmp_requests.png|border|class=tlt-border]] | ||
<table class="nd-mantable"> | <table class="nd-mantable"> | ||
| Line 814: | Line 814: | ||
This protection prevent <b>SSH attacks</b> by limiting connections in a defined period. | This protection prevent <b>SSH attacks</b> by limiting connections in a defined period. | ||
[[File: | [[File:Networking_rutos_manual_firewall_attack_prevention_ssh_attack_prevention.png|border|class=tlt-border]] | ||
<table class="nd-mantable"> | <table class="nd-mantable"> | ||
| Line 849: | Line 848: | ||
An <b>HTTP attack</b> sends a complete, legitimate HTTP header, which includes a 'Content-Length' field to specify the size of the message body to follow. However, the attacker then proceeds to send the actual message body at an extremely slow rate (e.g. 1 byte/100 seconds.) Due to the entire message being correct and complete, the target server will attempt to obey the 'Content-Length' field in the header, and wait for the entire body of the message to be transmitted, hence slowing it down. | An <b>HTTP attack</b> sends a complete, legitimate HTTP header, which includes a 'Content-Length' field to specify the size of the message body to follow. However, the attacker then proceeds to send the actual message body at an extremely slow rate (e.g. 1 byte/100 seconds.) Due to the entire message being correct and complete, the target server will attempt to obey the 'Content-Length' field in the header, and wait for the entire body of the message to be transmitted, hence slowing it down. | ||
[[File: | [[File:Networking_rutos_manual_firewall_attack_prevention_http_attack_prevention.png|border|class=tlt-border]] | ||
<table class="nd-mantable"> | <table class="nd-mantable"> | ||
| Line 885: | Line 884: | ||
In cryptography and computer security, a man-in-the-middle attack (MITM) is an attack where the perpetrator secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. One example of man-in-the-middle attacks is active eavesdropping, in which the attacker makes independent connections with the victims and relays messages between them to make them believe they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker. | In cryptography and computer security, a man-in-the-middle attack (MITM) is an attack where the perpetrator secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. One example of man-in-the-middle attacks is active eavesdropping, in which the attacker makes independent connections with the victims and relays messages between them to make them believe they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker. | ||
[[File: | [[File:Networking_rutos_manual_firewall_attack_prevention_https_attack_prevention.png|border|class=tlt-border]] | ||
<table class="nd-mantable"> | <table class="nd-mantable"> | ||
| Line 916: | Line 915: | ||
===Port Scan=== | ===Port Scan=== | ||
---- | |||
<b>Port Scan</b> attacks scan which of the targeted host's ports are open. Network ports are the entry points to a machine that is connected to the Internet. A service that listens on a port is able to receive data from a client application, process it and send a response back. Malicious clients can sometimes exploit vulnerabilities in the server code so they gain access to sensitive data or execute malicious code on the machine remotely. | <b>Port Scan</b> attacks scan which of the targeted host's ports are open. Network ports are the entry points to a machine that is connected to the Internet. A service that listens on a port is able to receive data from a client application, process it and send a response back. Malicious clients can sometimes exploit vulnerabilities in the server code so they gain access to sensitive data or execute malicious code on the machine remotely. | ||
Port scanning is usually done in the initial phase of a penetration test in order to discover all network entry points into the target system. The Port Scan section provides you with the possibility to enable protection against port scanning software. The Defending Type section provides the possibility for the user to enable protections from certain types of online attacks. These include <b>SYN-FIN</b>, <b>SYN-RST</b>, <b>X-Mas</b>, <b>FIN scan</b> and <b>NULLflags</b> attacks. | Port scanning is usually done in the initial phase of a penetration test in order to discover all network entry points into the target system. The Port Scan section provides you with the possibility to enable protection against port scanning software. The Defending Type section provides the possibility for the user to enable protections from certain types of online attacks. These include <b>SYN-FIN</b>, <b>SYN-RST</b>, <b>X-Mas</b>, <b>FIN scan</b> and <b>NULLflags</b> attacks. | ||
[[File: | [[File:Networking_rutos_manual_firewall_attack_prevention_port_scan.png|border|class=tlt-border]] | ||
<table class="nd-mantable"> | <table class="nd-mantable"> | ||