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VyOS is an open source network operating system Linux distribution based on Debian. [2]VyOS provides a free routing platform that competes directly with other commercially available solutions from well-known network providers.
In computer networking, xinetd (Extended Internet Service Daemon) is an open-source super-server daemon which runs on many Unix-like systems, and manages Internet-based connectivity. [3] It offers a more secure alternative to the older inetd ("the Internet daemon"), which most modern Linux distributions have deprecated. [4]
A SYN flood is a form of denial-of-service attack on data communications in which an attacker rapidly initiates a connection to a server without finalizing the connection. The server has to spend resources waiting for half-opened connections, which can consume enough resources to make the system unresponsive to legitimate traffic.
crond [1] Time-based job scheduler, runs jobs in the background. dhcpd: Dynamically configure TCP/IP information for clients. fingerd: Provides a network interface for the finger protocol, as used by the finger command. ftpd [1] Services FTP requests from a remote system. httpd: Web server daemon. inetd [4] Listens for network connection requests.
SYN cookie is a technique used to resist SYN flood attacks. The technique's primary inventor Daniel J. Bernstein defines SYN cookies as "particular choices of initial TCP sequence numbers by TCP servers." In particular, the use of SYN cookies allows a server to avoid dropping connections when the SYN queue fills up.
Zebra is a discontinued routing software package that provides TCP/IP based routing services with routing protocols support such as RIP, OSPF and BGP. Zebra also supports BGP Route Reflector and Route Server behavior. In addition to IPv4 routing protocols, Zebra also supports IPv6 routing protocols.
SYN from Peer A reaches NAT-b, SYN from Peer B reaches NAT-a; Depending on the timing of these events (where in the network the SYN cross), at least one of the NAT will let the incoming SYN through, and map it to the internal destination peer; Upon receipt of the SYN, the peer sends a SYN+ACK back and the connection is established.
In computer networking, TCP Fast Open (TFO) is an extension to speed up the opening of successive Transmission Control Protocol (TCP) connections between two endpoints. It works by using a TFO cookie (a TCP option), which is a cryptographic cookie stored on the client and set upon the initial connection with the server. [ 1 ]