Waveshare WS-431E User Manual page 68

WS-431E
4G Router
For example: 172.16.10.1/24, corresponding to IP of 172.16.10.1 and subnet mask of
255.255.255.0;
Local tunnel IP: IP address of local GRE tunnel;
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TTL: set the TTL of GRE channel, which is 255 by default;
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Set MTU: set the MTU of GRE channel, and the default is 1450.
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