[CentOS] Securing serial ports - fax modems

James B. Byrne byrnejb at harte-lyne.ca
Fri Jul 25 20:27:17 UTC 2008

I have already deployed a fax server and am about to deploy a backup
system for this host at our off-site facility.  It struck me that I have
given no thought to securing the serial port to unauthorized access.  The
modem is a Multi-Tech MT5634ZBA which supports data as well as fax.  So
this poses the same type of risk, if not to the same degree, as an ssh or
telnet port but without the availability of a firewall to throttle
repeated unsuccessful connection attempts.

Are there any recommendations on what should be done in this circumstance
or am I fretting unduly?


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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

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