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An IP tunnel is an Internet Protocol (IP) network communications channel between two networks. It is used to transport another network protocol by encapsulation of its packets . IP tunnels are often used for connecting two disjoint IP networks that don't have a native routing path to each other, via an underlying routable protocol across an ...
IP in IP is an IP tunneling protocol that encapsulates one IP packet in another IP packet. To encapsulate an IP packet in another IP packet, an outer header is added with Source IP , the entry point of the tunnel, and Destination IP , the exit point of the tunnel.
In computer networks, a tunneling protocol is a communication protocol which allows for the movement of data from one network to another. They can, for example, allow private network communications to be sent across a public network (such as the Internet), or for one network protocol to be carried over an incompatible network, through a process called encapsulation.
GRE packets that are encapsulated within IP directly, use IP protocol type 47 in the IPv4 header's Protocol field [3] or the IPv6 header's Next Header field. [4] For performance reasons, GRE can also be encapsulated in UDP packets. [5] Better throughput may be achieved by using Equal-cost multi-path routing.
A potential point of confusion in L2TP/IPsec is the use of the terms tunnel and secure channel. The term tunnel-mode refers to a channel which allows untouched packets of one network to be transported over another network. In the case of L2TP/PPP, it allows L2TP/PPP packets to be transported over IP.
When the endpoint isn't a static IP address, the user, or a program, has to instruct the tunnel broker to update the endpoint address. This can be done using the tunnel broker's web site or using an automated protocol like TSP or Heartbeat, as used by AICCU. In the case of a tunnel broker using TSP, the client automatically restarting the ...
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In tunnel mode, the entire IP packet is encrypted and authenticated. It is then encapsulated into a new IP packet with a new IP header. Tunnel mode is used to create virtual private networks for network-to-network communications (e.g. between routers to link sites), host-to-network communications (e.g. remote user access) and host-to-host ...