Date: Thu, 27 Jan 2000 17:21:50 -0700 From: Brett Glass <brett@lariat.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: security@FreeBSD.ORG Subject: Re: Riddle me this Message-ID: <4.2.2.20000127171529.00c56a00@localhost> In-Reply-To: <200001270425.UAA18744@apollo.backplane.com> References: <200001270355.UAA01355@lariat.lariat.org>
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At 09:25 PM 1/26/2000 , Matthew Dillon wrote: > It's hard to say without doing a continuous tcpdump but the most likely > possibility is that someone was playing a game or doing something else > related to sending and receiving UDP packets, and then disconnected. Actually, I think I just found out what it was. Two words: HP JetAdmin. Apparently, some people at the site just got a new JetDirect print server. When you install the client software, it sets itself up -- by default -- to test EVERY IP ADDRESS IN THE SUBNET to see if it has an HP print server on it. And it gets worse. The default address of the print server hardware -- which the client software tries to reach when it's setting up -- is (are you ready?) 192.0.0.192. This isn't a legal address, nor is it a standard "unregistered" address for a private subnet. So, natd tries to route it. We really ought to block this by default by putting a "black hole" entry in the system routing table. It certainly should not ever be routed.... Cisco routers automatically blackhole it. --Brett To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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