R2631E router acts as NAT，the occupation of CPU reaches more than 70%, the underlying users go on line slowly.
1. logon to check via display nat translations and detect many private network IPs change interface to send connections, so the NAT connecting number meets more than 10,000 items and surpasses the maximum NAT connecting number.
2. after the careful check, some individual address occupy many connecting numbers, even one address(user) occupies thousands of links. Prohibit the access control list of the addresses, CPU restores normal, so dose the underlying service.
3. judge if there is virus attack, recommend to kill viruses.
Because the memory is limited, only a certain of NAT connection is supported, as NAT connecting number surpasses the range, the processing burden of CPU is over, and the occupying rate is too high, so the underlying users cannot do NAT switch normally.