Firewall Tutorial
Filter basics
In the source or destination IP address fields, the IP address that is entered must be the network address of the subnet. A host address can be entered, but the applied subnet mask must be 32 bits (255.255.255.255).
Netopia Firmware Version 7.6 has the ability to compare source and destination TCP or UDP ports. These options are as follows:
| Item | What it means |
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| No Compare | Does not compare TCP or UDP port |
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| Not Equal To | Matches any port other than what is defined |
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| Less Than | Anything less than the port defined |
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| Less Than or Equal | Any port less than or equal to the port defined |
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| Equal | Matches only the port defined |
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| Greater Than or Equal | Matches the port or any port greater |
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| Greater Than | Matches anything greater than the port defined |
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Example network |
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Input Packet
Filter
Internet
IP 200.1.1.??
Data
