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Filtering Rules
Service-Dependent Filtering
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Permit incoming Telnet sessions only to a specific list of
internal hosts
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Permit incoming FTP sessions only to specific internal hosts
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Permit all outbound Telnet sessions
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Permit all outbound FTP sessions
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Deny all incoming traffic from specific external networks
Service-Independent Filtering
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Deny SNMP options like
giving routing table
- Inspect for specific IP options
- Source Routing Attacks
- Tiny Fragment Attacks.
- Checking for a special fragment offset
Sridhar Iyer
2001-01-08