Tag: #internet-protocol

What is an authoritative DNS server? What is a recursive DNS server?

Authoritative DNS servers provide definitive responses for their domains, while recursive DNS servers consult other servers to serve responses, caching results to reduce load on authorities. 2017-08-20

STUN is a protocol that allows clients to discover their public IP address and port, enabling peer-to-peer connections in WebRTC. 2017-01-15

How fast does an IP packet travel?

IP packets travel at ~20% the speed of light, with most time spent in routers rather than on the wire. 2017-01-01

What do DNS datagrams look like?

The structure and contents of a DNS request datagram, including the header, question section, and how to represent it in C. 2016-12-31

What are ‘protocol numbers’ in IP?

An IP packet contains a ‘protocol number’ that identifies the protocol (e.g. TCP, UDP) running over IP. The kernel uses this to determine how to handle the packet. 2016-12-23

All content copyright James Fisher.