Configuring IP Tunneling
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 15-36
Transmission Control Protocol (TCP)
TCP Half-open Timeout Configuration
Use the ip tcp half-open-timeout command to configure the timeout periods for dropping half-open TCP
connections.
Current supported values are 3, 7, 15, 31 and 63 (in seconds). The default value is 63 seconds.
-> ip tcp half-open-timeout 7
The show ip tcp half-open-timeout displays the timeout value configured for half-open TCP sessions.
Displaying TCP Information
Use the show tcp statistics command to display TCP statistics. Use the show tcp ports command to
display TCP port information.
Displaying UDP Information
UDP is a secondary transport-layer protocol that uses IP for delivery. UDP is not connection-oriented and
does not provide reliable end-to-end delivery of datagrams. Few applications can safely use UDP to send
datagrams that do not require the extra overhead added by TCP. Use the show udp statistics command to
display UDP statistics. Use the show udp ports command to display UDP port information.
Tunneling
Tunneling is a mechanism that can encapsulate a wide variety of protocol packet types and route them
through the configured tunnels. Tunneling is used to create a virtual point-to-point link between routers at
remote points in a network. This feature supports the creation, administration, and deletion of IP interfaces
whose underlying virtual device is a tunnel. The OmniSwitch implementation provides support for two
tunneling protocols: Generic Routing Encapsulation (GRE) and IP encapsulation within IP(IPIP).
Generic Routing Encapsulation
GRE encapsulates a packet to be carried over the GRE tunnel with a GRE header. The resulting packet is
then encapsulated with an outer header by the delivery protocol and forwarded to the other end of the GRE
tunnel. The destination IP address field in the outer header of the GRE packet contains the IP address of
the router at the remote end of the tunnel. The router at the receiving end of the GRE tunnel extracts the
original payload and routes it to the destination address specified in the IP header of the payload.
IP Encapsulation within IP
IPIP tunneling is a method by which an IP packet is encapsulated within another IP packet. The Source
Address and Destination Address of the outer IP header identifies the endpoints of tunnel. Whereas Source
Address and Destination Address of the inner IP header identifies the original sender and recipient of the
packet, respectively.
Note. A switch can support up to 127 GRE tunnel interfaces.
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