Whether the USG6330 supports two consecutive same network segments

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Yes.
This can be implemented through NAT. However, this is not recommended.

Other related questions:
Whether two same network segments can be configured for the USG6000
Yes. This configuration can be achieved by means of NAT. However, this configuration is not recommended.

Whether the USG2000 and USG5000 support one-way configuration for the same network segment
On the firewall, the ACL can be used to block TCP packets to implement one-way configuration. However, this does not apply to packets of other types.

Must the IP addresses of the two peer ends on FR networks be in the same network segment
The IP addresses of two peer ends have no need to be configured in the same network segment if both ends are both AR routers.

Whether USG firewalls support IP addresses in the same network segment configured for different interfaces
The USG2000, USG5000, and USG6000 do not support IP addresses in the same network segment configured for different interfaces. However, primary and secondary IP addresses of the same interface can be in the same network segment.

Must the IP addresses of interfaces on the two ends of a P2P link be on the same network segment
On an OSPF P2P network, if the link layer protocol is Point-to-Point Protocol (PPP) and different network segment addresses are configured on the interfaces on the two ends of the link, OSPF neighbors are in the Full state and forward traffic normally. If link layer protocol traffic is encapsulated over High-Level Data Link Control (HDLC) or another protocol, no neighbor relationship can be established. The difference in the OSPF neighbor relationship establishment with PPP and HDLC is that with PPP, the IP address of the peer can be negotiated. This allows the route to the peer to be obtained without additional operations. In addition, on an OSPF broadcast network, NBMA network, or P2MP network, the IP address of the neighbor and that of the local interface must be on the same network segment.

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