Must the IP addresses of interfaces on the two ends of a P2P link be on the same network segment

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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.

Other related questions:
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.

Do the IP addresses of the two ends of an FR link have to be on the same network segment
If the devices on both ends are AR series routers, the IP addresses do not need to be on the same network segment.

Does the AR support difference of network segments between an interface IP address and a virtual IP address of VRRP
The AR does not support difference of network segments between an interface IP address and a virtual IP address of VRRP. The IP addresses must be set to the same network segment.

If the IP addresses of devices on both ends of a PPP link are not on the same network segment, can the two devices ping each other
Yes. Network Control Protocol (NCP) in Point-to-Point Protocol (PPP) can be used to obtain the IP address of the peer device. Therefore, even if the IP addresses of both ends of the link are not on the same network segment, the two devices can ping each other.

Whether the two ends of a WDM link must have the same service type
Yes, the two ends of a WDM link must have the same service type.

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