Snort mailing list archives
Re: Re: HP Jetdirect Printers and portscans
From: Rich Adamson <radamson () routers com>
Date: Fri, 29 Jun 2001 14:00:23 -0600
Since the subject came up (again) ... does anyone know how to get the users' pc's to stop doing SNMP scans for HP printers? ... all the printers our users need are already installed in their "printers" window.
As someone else mentioned, the JetAdmin utilities will do this, however simply installing an HP print driver on a Windows machine will also do it. One of the HP *.dll's will scan all IP's within the netmask defined on the Windows machine, looking for HP printers using snmp. As each IP address is checked, if that address does not support snmp, an icmp port unreachable message is returned. If it does find an HP printer, snmp is used to interrogate the features and fonts supported by "that" remote printer. In stock Windows 95 systems, Microsoft distributed an overly aggressive *.dll from HP that would go screaming through every IP address on a frequent basis. If these machines were assigned IP's with a Class-B netmask, each machine would check all 65,000 addresses, and it would take approximately 5 to 10 of the machines to fully consume an ethernet segment causing very poor performance. (The JetAdmin utilities were not actually installed on any of these machines.) HP subsequently provided a replacement *.dll file that was significantly less aggressive. Some HP drivers still use that same approach on an IP-only network, so not sure you can actually remove it without killing the user's ability to access those JetDirect printers. Given the above, you should be able to find something on HP's web site that discusses this, which will lead you to exactly which files initiates the scans, etc. Rich _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: http://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- HP Jetdirect Printers and portscans Paul Asadoorian (Jun 29)
- Re: HP Jetdirect Printers and portscans Joe McAlerney (Jun 29)
- <Possible follow-ups>
- Re: HP Jetdirect Printers and portscans Fred Portnoy (Jun 29)
- Re: Re: HP Jetdirect Printers and portscans Ryan Russell (Jun 29)
- Re: Re: HP Jetdirect Printers and portscans Steve Shockley (Jun 29)
- Re: Re: HP Jetdirect Printers and portscans Rich Adamson (Jun 29)
- RE: Re: HP Jetdirect Printers and portscans Jon Tollerton (Jun 29)