Solution:
Because router C, when establishing the IPsec connection, receives the IP address 172.20.1.21, but instead of adding it to the address list as a single address 172.20.1.21/32, it adds 172.20.1.21/24 with the entire subnet, which then broadcasts OSPF. And router B, upon receiving information about the new path, decides to respond to the 172.20.1.0/24 subnet through router C.
Because router C, when establishing the IPsec connection, receives the IP address 172.20.1.21, but instead of adding it to the address list as a single address 172.20.1.21/32, it adds 172.20.1.21/24 with the entire subnet, which then broadcasts OSPF. And router B, upon receiving information about the new path, decides to respond to the 172.20.1.0/24 subnet through router C.
Statistics: Posted by Zergling — Tue Jan 30, 2024 9:04 pm