Can users access the internet after an L2TP tunnel is established

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Yes. Only the traffic from users to intranet servers is transmitted by L2TP tunnels. Therefore, tunnels do not affect user access to the Internet.

Other related questions:
Can an IPSec tunnel be established on the AR in a scenario where users access the Internet in dialup mode
Huawei AR routers support IPSec configured in a scenario where users access the Internet in dialup mode. For details, see "Using VPN to Implement WAN Interconnection" in Typical Configuration Examples. You can select a configuration example as required.

How many L2TP tunnels can be established on a device
The number of L2TP tunnels that can be established on a device is shown as follows. -AR120&AR150&AR160&AR200&AR500 series: 16 -AR510 series: 2 -AR1200 series, AR2201-48FE, AR2202-48FE, AR2204, AR2204E: 128 -AR2220, AR2220E, AR2240 (using SRU40 or SRU60), AR2240C (using SRU40 or SRU60), AR3200 (using SRU40 or SRU60) series: 512 -AR2240 (using SRU80, or SRU100E), AR2240C (using SRU80), AR3200 (using SRU80, or SRU100E) series: 1024 -AR2240 (using SRU200, or SRU200E), AR2240C (using SRU200), AR3200 (using SRU200, or SRU200E) series: 2048. However, when the device is used as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups, that is, 1024. -AR2240 (using SRU400), AR2240C (using SRU400), AR3200 (using SRU400) series: 4096. However, when the device is used as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups, that is, 1024. -AR3600 (using SRUX5) series: 1 to 2048. However, when the device is used as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups, that is, 1024.

Can L2TP tunnels be established if the public address of the LNS is not fixed
Yes. You need to associate the public IP address of the LNS with a domain name and set the domain name as the server address on the LAC.

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