RACOM M!DGE3, Руководство пользователя

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GRE L2 Enable
Switches all L2 tunnels On or Off.
Individual L2 tunnels:
Enable
Enables actual L2 tunnel. Maximum number of configurable tunnels is 256.
Note
Informational note
Peer address
IP address of the equipment with the second end of the tunnel. This address is the expected source
address of incoming GRE packets from the peer.
Network interface name
Has to be set as one of existing bridge’s name in SETTING/Interfaces/Ethernet/ Network interface
Name
Key enabled
Enables using key identification of the tunnel from/to the same peer
Key
Identification number of the tunnel Number {0 – 4,294,967,295}, default = 0
MTU [B]
MTU of the L2 tunnel. Number {74 – 1500}, default = 1462
Overhead of the L2 tunnel is 38 B , so it should be GRE MTU = Path MTU - 38.
7.4.3. GRE L3
GRE L3 tunnel works as an additional unit’s interface with its own IP address (and mask). The routing
rules are used for sending packets to this interface. It bridges part of the network, so it seems to be
one hop for the user traffic.
M!DGE3 Cellular Router – © RACOM s.r.o. 118
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