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LISA '03 — Abstract

Tossing Packets Over the Wall Using Transmit-Only Ethernet Cables

Jon Meek and Frank Colosimo, Wyeth


Solutions for transporting packets from an insecure DMZ into an organization's internal network are described. All of the solutions attempt to prevent the establishment of two-way traffic by physically cutting the transmit wires at the receiving device on the internal network. Because alternate paths to the packet sender could exist, a user-mode packet relay on the internal network is used to accept and re-transmit the packets to the appropriate destination.

Applications discussed include relaying of syslog and SNMP trap packets from DMZ systems to receiving hosts on a secure network, and monitoring traffic for IDS and diagnostic purposes using a system conveniently located on the secure internal network.

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Last changed: 7 Nov. 2003 aw
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