JOOHONG Information & Communications Ltd. SL-4560 ユーザーズマニュアル
SL-4560 ADSL Modem
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2.2.3.4. Do not check the ‘Enable NAT’ , ‘Enable Firewall’ options. Then [Next]
2.2.3.5. Displayed IP is the IP for web management.
Basically, ‘Enable NAT’ and ‘Enable Firewall’ would be checked.