Whether the USG6330 interface supports Internet access without a private IP address

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Yes.
This function is supported as long as you configure the NAT.

Other related questions:
Whether the interface address of the USG2000 can be set to a private IP address to access the Internet
Yes. The Internet access is supported as long as the interface address experiences NAT.

Allow specified IP addresses to access the Internet through an interface on an S series switch
You can configure an ACL-based traffic policy and apply the traffic policy to an interface on an S series switch to allow specified IP addresses to access the Internet through the interface. For example, configure GE0/0/1 to allow only the user with the IP address of 1.1.1.2 and prevent all other users to access the Internet. [HUAWEI] acl number 3030 [HUAWEI-acl-adv-3030] rule permit ip source 1.1.1.2 0 [HUAWEI-acl-adv-3030] quit [HUAWEI] acl number 3031 [HUAWEI-acl-adv-3031] rule permit ip [HUAWEI] traffic classifier test1 [HUAWEI-classifier-test1] if-match acl 3030 [HUAWEI] traffic classifier test2 [HUAWEI-classifier-test2] if-match acl 3031 [HUAWEI] traffic behavior test1 [HUAWEI-behavior-test1] permit [HUAWEI] traffic behavior test2 [HUAWEI-behavior-test2] deny [HUAWEI] traffic policy test [HUAWEI-trafficpolicy-test] classifier test1 behavior test1 [HUAWEI-trafficpolicy-test] classifier test2 behavior test2 [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] traffic-policy test inbound

Configuring the USG6000 to access the Internet through a static IP address
Perform as follows to enable the USG6000 to access the Internet through a static IP address: Search for CLI: Example for Accessing the Internet Using a Static IPv4 Address in USG6000 Product Documentation.

How do I check IP addresses for Internet access on the AR router
1. Run the display nat outbound command to check the outbound NAT configuration and determine the ACL referenced by outbound NAT. 2. Run the display acl { | name | all } command to check the source address in the ACL. The source address is the address segment for Internet access.

Configuring Internet access only within a specified period of time on the USG6000
Configure a time-based security policy.

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