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Starting from which version does the device support NAT traversal in L2TP

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Starting from V200R002C00SPC200, the device supports this function.

Other related questions:
Does L2TP support NAT traversal
L2TP supports NAT traversal. L2TP uses UDP port 1701, so the destination port must be port 1701 when NATis used.
Does the AR enabled with L2TP support NAT traversal
L2TP supports NAT traversal. Because L2TP uses UDP port 1701, the destination port number must be 1701 during translation.
From which version does the AR router support 80211ac
Currently, the AR does not support 802.11ac.
When does the DHCP server start to ping a DHCP client
Starting from V100R006C00, upon receiving the Discover message, an S series switch starts to ping the IP addresses that the DHCP server will assign to a client. For details, see the dhcp server ping command.
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