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Whether the intranet servers can use the same port number to access the external network after experiencing the NAT on the USG2000, USG5000, and USG6000

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Can the intranet servers use the same port number to access the external network after experiencing the NAT on the USG2000, USG5000, and USG6000?
No.

Other related questions:

Whether the intranet port number and extranet port number can be the same in port mapping mode on the USG6000 series

They can be the same or different.

Method used to test whether the USG5000 is accessible after NAT Server is configured

You can test the accessibility by accessing the firewall from the external network or testing the external network port using the Telnet utility.

Whether the USG2000 and USG5000 series support the NAT based on domain names accessed by intranet users

USG firewalls do not support NAT based on domain names accessed by intranet users. To allow users to access specified websites, you can configure the URL filtering.

Method used to check whether intranet servers can access the Internet on the USG6000 series

You can view session entries on the USG6000 series or perform ping tests to check whether intranet servers can access the Internet.

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Whether the intranet servers can use the same port number to access the external network after experiencing the NAT on the USG2000, USG5000, and USG6000

Other related questions:

If you have more questions, you can seek help from following ways: