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How to configure acl table on the router so that the computer on one side of the router can only access port 80 of the server on the other side?
I don't know what router it is. If it is Cisco's:

1 has established an acl that really belongs to deny.

The access list 1 10 allows tcp any any eq www.

2 Apply acl 1 10 to the router port near the computer.

Ip access-group 1 10 output

If the out parameter cannot be used, apply acl 1 10 to the router port near the server.

Ip access-group 1 10 in

Other routers have similar policies.