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DMZ Firewall Solution for the Express Router
07-12-99 Version 1.0 2
Table of Contents
1 Introduction............................................................................................................................3
1.1 About This Document..........................................................................................................3
1.2 References............................................................................................................................3
1.3 What is a DMZ.....................................................................................................................3
1.4 IP Filters in the Express Router............................................................................................4
2 General Setup and Considerations.......................................................................................4
2.1 IP Address Selection ............................................................................................................4
2.2 Routing Setup.......................................................................................................................5
2.3 DNS Setup............................................................................................................................5
2.4 E-mail (SMTP) Setup...........................................................................................................5
2.5 FTP Setup.............................................................................................................................5
2.6 HTTP Setup..........................................................................................................................5
2.7 News (NNTP) Setup ............................................................................................................5
2.8 Management Access Setup...................................................................................................5
3 DMZ Single IP Address Solution..........................................................................................6
3.1 Static Routing Setup.............................................................................................................6
3.2 Network Address Translation (NAT) Setup.........................................................................6
3.3 IP Filters Setup.....................................................................................................................7
3.3.1 LAN1 Filters ................................................................................................................7
3.3.1.1 Receive (Rx) Filters on LAN1 .............................................................................7
3.3.1.2 Transmit (Tx) Filters on LAN1............................................................................8
3.3.2 LAN2 Filters ..............................................................................................................10
3.3.2.1 Receive (Rx) Filters on LAN2 ...........................................................................10
3.3.2.2 Transmit (Tx) filters on LAN2...........................................................................12
3.3.3 Internet Connection Filters.........................................................................................13
3.3.3.1 Receive (Rx) Filters on the connection to the Internet.......................................13
3.3.3.2 Transmit (Tx) Filters on the Connection to the Internet.....................................16
4 DMZ Multiple IP Address Solution....................................................................................17
4.1 IP Address Assignment ......................................................................................................17
4.2 Static Routing Setup...........................................................................................................17
4.3 Network Address Translation (NAT).................................................................................18
4.4 IP Filters Setup...................................................................................................................18
4.4.1 LAN1 Filters ..............................................................................................................18
4.4.1.1 Receive (Rx) Filters on LAN1 ...........................................................................18
4.4.1.2 Transmit (Tx) Filters on LAN1..........................................................................19
4.4.2 LAN2 Filters ..............................................................................................................21
4.4.2.1 Receive (Rx) Filters on LAN2 ...........................................................................21
4.4.2.2 Transmit (Tx) filters on LAN2...........................................................................24
4.4.3 Internet Connection Filters.........................................................................................24
4.4.3.1 Receive (Rx) Filters on the Connection to the Internet......................................24
4.4.3.2 Transmit (Tx) Filters on the Connection to the Internet.....................................27