serial tunnel. Router feature allowing two SDLC- or HDLC-compliant devices to connect to one another through an arbitrary multiprotocol topology (using Cisco routers) rather than through a direct serial link.
Sends serial tunnel (STUN) notifications.
(Simple Traversal of UDP through NATs (Network Address Translation)) A protocol for assisting devices behind a NAT firewall or router with their packet routing. STUN enables a device to find out its public IP address and the type of NAT service its sitting behind. It operates on TCP and UDP port 3478
Serial (SDLC) tunneling. Process that allows SDLC traffic to be bridged over token ring LANs. See also SDLC.
Simple Traversal of UDP through NAT Different routers handle NAT differently. Which method your router uses will have an impact on how your ATA needs to operate. Some ATAs have a STUN client built in. Therefore your ATA can send a message to a STUN server and get a response back. This process called Stunning will tell the ATA what the public IP address of the ATA is, and how the Router is passing packets between the ATA and the internet.
Simple Traversal of UDP through NAT is a lightweight protocol that allows applications to discover the presence and types of NATs and firewalls between them and the public Internet. It also provides the ability for applications to determine the public Internet Protocol (IP) addresses allocated to them by the NAT.(RFC 3489).
See STUN (serial tunnel) in the "Cisco Systems Terms and Acronyms" section.
STUN (Simple Traversal of UDP (User Datagram Protocol) through NATs (Network Address Translators)) is a network protocol allowing a client behind a NAT (or multiple NATs) to find out its public address, the type of NAT it is behind and the internet side port associated by the NAT with a particular local port. This information is used to set up UDP communication between two hosts that are both behind NAT routers. The protocol is defined in RFC 3489.