Firewall Filter Examples

The following examples illustrate how to define firewall filters:

• Example: Blocking Telnet and SSH Access
• Example: Blocking TFTP Access
• Example: Accepting DHCP Packets with Specific Addresses
• Example: Defining a Policer for a Destination Class
• Example: Counting IP Option Packets
• Example: Accepting OSPF Packets from Certain Addresses
• Example: Matching Packets Based on Two Unrelated Criteria
• Example: Counting Both Accepted and Rejected Packets
• Example: Blocking TCP Connections to a Certain Port Except from BGP Peers
• Example: Accepting Packets with Specific IPv6 TCP Flags
• Example: Setting a Rate Limit for Incoming Layer 2 Control Packets