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DMZ Firewall Solution for the Express Router

07-12-99 Version 1.0 22

Filter Function Settings

Src. address type: All

Src. port: All

2 Prevents tunnel packets from entering

the DMZ network

Action: Discard

Protocol: TCP

Dest. address type: All

Dest port: Tunnel

Src. address type: All

Src. port: All

3 Prevents RSVP packets from entering

the DMZ network/router. Three

separate filters are required.

Action: Discard

Protocol: RSVP

Dest. address type: All

Dest. port : All

Src. address type: All

Src. port : All

4 Action: Discard

Protocol: UDP

Dest. address type: All

Dest. port : 1698

Src. address type: All

Src. port : All

5 Action: Discard

Protocol: UDP

Dest. address type: All

Dest. port : 1699

Src. address type: All

Src. port : All

6 Prevents BootP updates from entering

the DMZ network/router.

Action: Discard

Protocol: UDP

Dest. address type: All

Dest. port: 67

Src. address type: All

Src. port: All

7 Prevents Syslog updates from entering

the DMZ network/router

Action: Discard

Protocol: UDP

Dest. address type: All

Dest. port: 514

Scr. address type: All

Src. port : All

8

Discards all packets that fake the IP

address of the router on LAN1 as these

packets are allowed to pass the Tx filter

on LAN1

Action: Discard

Protocol: UDP

Dest. address type: All

Dest. port: All

Scr. address type: Host

Src. address: <LAN1 IP address>

Src. port : All

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