Using Term to Pierce an Internet Firewall: Introduction

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The « term » program is normally used over a modem or serial line, to allow various host-to-host services to flow along this simple serial connection. However, sometimes it is useful to establish a term connection between two machines that communicate via telnet. The most interesting instance of this is for connecting two hosts which are separated by ethernet firewalls or SOCKS servers. Such firewalls provides facilities for establishing a telnet connection through the firewall, typically by using the SOCKS protocol to allow inside machines to get connections out, and requiring outside users to telnet first to a gateway machine which requires a one-time password. These firewalls make it impossible to, for instance, have X clients on an inside machine communicate with an X server on an outside machine. But, by setting up a term connection, these restrictions can all be bypassed quite conveniently, at the user level.

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