Whether the NAT policy of the USG2000 can replace the source IP address and destination IP address simultaneously

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The bidirectional NAT function of the USG2000 can bidirectionally translate the destination IP address and source IP address simultaneously.

Other related questions:
Can the AR router translate source and destination IP addresses simultaneously using NAT
The AR router can use NAT to translate source and destination IP addresses simultaneously.

Whether the AR router can simultaneously do the NAT translation on the source IP and destination IP ?
Yes, AR router supports to do NAT translation on both the source IP and the destination IP.

Whether the source address specified in the security policy is the translated address when the source NAT policy is configured
The source address specified in the security policy is the address before NAT when the source NAT policy is configured. When the firewall translates an address in a packet, it searches for the interzone security policy. The firewall translates only the address that passes the security policy check and matches the conditions defined in the interzone policy. Therefore, the source address specified in the interzone security policy is the address before NAT, that is, the private IP address.

Whether an address in the NAT address pool can be configured as a public IP address for NAT Server
Yes.

Can an S series switches forward a packet if both the source and destination IP addresses of the packet are multicast addresses
The S5710-C-LI or S5700SI drops packets whose source and destination IP addresses are both multicast addresses. Other switches broadcast such packets in a VLAN.

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