1. This is a local login fault, so there is no business with the Microwave link itself.
2. Since it is a fault of communication, so communication parameters should be firstly check and the following information is got:
NE 9-8 NE IP: 10.109.1.8 Submask: 255.255.0.0
NE 9-9 NE IP: 10.109.1.9 Submask: 255.255.255.0
Laptop IP:10.109.1.125 Submask: 255.255.255.0
3. Check the IP routing table, and pick out the two key items as follow:
4. As we know, when Weblct on the laptop logins into the NE 9-8, the laptop sends out the packet to the NE 9-8, and the NE 9-8 sends back a reply packet according to the routing foward table, and right now as shown above in the route table ,there are two available pieces of routing, 10.109.0.0/16 and 10.109.1.0/24, and the corresponding interface are NMS port (Etherent1) and Microwave link(Serial2), based on the longest match principle, 10.109.1.0/24 is the final option, and the reply packet is forwarded to Serial2 but not Ethernet1, in another word, the laptop can not receive the reply packets, and the Weblct login fails.