Destination Port Unreachable

Installing and Using OpenWrt
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In VMware, I want to combine two nets.
In the first net there's only one computer, and its IP is 192.168.11.78.
In the second net there's only one computer too, and its IP is 192.168.169.126.
Between those two nets, there's a router. It have two ports with IP of 192.168.11.3 and 192.168.169.3 comparatively.
When it was in the computer whose IP's 192.168.11.78, I can ping 192.168.11.3, 192.168.169.3 successfully.
When it was in the computer whose IP's 192.168.169.126, I can ping 192.168.169.3, 192.168.11.3 successfully too.
Here comes the most weird thing, while the computer whose IP's 192.168.169.126 pinging 192.168.11.78, it said "Destination Port Unreachable".
Just as the same, while the computer whose IP's 192.168.11.78 pinging 192.168.169.126, it said "Destination Port Unreachable" too.
Besides, in 192.168.11.78, while pinging 192.168.169.1, 192.168.169.2, 192.168.169.4, 192.168.169.5......until 192.168.169.254. the only word it said is "Destination Port Unreachable". Only pinging 192.168.169.3 was successful.
I've been stuck in it for a whole afternoon, I really don't know what else I can do.
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The firewall of the router prohibits forwarding between the two subnets.

Possible solutions:

  1. Assign both interfaces to the lan firewall zone (assuming you haven't touched the default settings).
  2. If the interfaces do not belong to any zone, set the FORWARD policy in the default section (in /etc/config/firewall) to ACCEPT.
  3. If the interfaces belong to different zones, create forwarding rules.

https://openwrt.org/docs/guide-user/firewall/firewall_configuration#zones
https://openwrt.org/docs/guide-user/firewall/firewall_configuration#forwardings

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