PLANET CS-2001 - Manual (Page 305)

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Step 31. In the Filter Properties window, select “A specific IP Subnet” for
Source address, and then type “192.168.10.0” as A Company‘s subnet
address and “255.255.255.0” as subnet mask. After that, select “A specific
IP Address” for Destination address, and then type “211.22.22.22” as B
Company‘s WAN IP address and “255.255.255.255” as subnet mask. Note:
Do not enable “Mirrored. Also match packets with the exact opposite source
and destination addresses”. （Figure 11-92）
Figure 11-92 Filter Properties Settings