Wellink Corporation NEOBIT1014VA ユーザーズマニュアル

Example 2. Blocking Telnet accesses to the NEOBIT 1014VA: 

1.  Add a new rule for packets incoming on the ppp-0 interface. 

2.  Specify that the packet must contain the TCP protocol, and 

must be destined for port 23, the well-known port number 
used for the Telnet protocol. 

3.  Enable the rule by clicking the radio button at the top of the 

page. 

4. Click 

 to create the rule, and commit your 

changes.  

Figure 59 shows how this rule could be configured: