ZyXEL Communications LTE3316-M604, Руководство пользователя

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Chapter 18 VPN
LTE3316 Series User’s Guide
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18.5.1 Add GRE
After you enabled GRE Tunnel click add to open the following screen, and create a GRE tunnel.
Figure 73 GRE: Add
Tunnel IP This displays the IP address to use as the source address for the packets this WAN IP
tunnels to the remote gateway. The remote gateway sends traffic to this IP address.
Remote IP This displays the IP address of the remote client to which this WAN IP tunnels traffic.
MTU This displays the Maximum Transmission Unit (MTU). This is the maximum size of each
data packet, in bytes, that can move through this interface. If a larger packet
arrives, the Zyxel Device divides it into smaller fragments.
Key This displays the key for the GRE connection, a value between 0 ~ 9999999999.The
GRE tunnel will request this key for packet transportation. The client needs to enter
this key to authenticate the source of the packet.
TTL This displays the Time To Live (TTL). This is a time limiter that defines the lifetime of a
packet. Every time the packet is forwarded, it will reduce the TTL value by 1, if this
time limiter reaches 0, the packet will be discarded. The default value is 255.
Keep-alive This displays how often (in seconds) the Zyxel Device sends pings the IP to keep the
GRE tunnel up.
Actions Click the Edit button to modify an L2TP client ‘s configurations. Select it and click
Delete to remove it.
Cancel Click Cancel to exit this screen without saving.
Apply Click Apply to save your changes back to the Zyxel Device.
Table 52 Configuration > Application > VPN > GRE (continued)
LABEL DESCRIPTION