Caimore CM520-8AF/W User Manual page 25

Example 2 of IP address filtering:
1、select "setup client IP filter"
2、Running rule: "receive packet matches following rules", click "Apply" to save.
Instruction：if running rule select "receive packet matches following rules", default rule is :
Gateway forbids all data packet go through except data packet of picture
3. Input parameters in IP rule.
This example parameter:
Name：enableipfilter02
LAN IP：192.168.1.23
WAN IP：121.204.201.13
Protocol：all
Direction：IN/OUT
Interface：PPP0
Read picture 4-10-3，then click "Submit" to save.
4、Explanation and Instruction
After this rule built, gateway will start IP address filtering function. According to running
rule "Receive packet matching following rule", gateway forbid all data packet to go
through, but only allow protocol data packets
"121.204.201.13"(select "IN/OUT"
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Picture 4-2-3
direction) to go through PPPO interface
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(select "ALL") from WAN
(select PPP0