Date: Mon, 25 Sep 2000 21:45:06 -0400 From: Ted <webmaster@powerusersbbs.com> To: chad@DCFinc.com, "freebsd-stable@FreeBSD.ORG" <freebsd-stable@FreeBSD.ORG> Subject: Re: arp Message-ID: <39CFFFA2.352D5746@powerusersbbs.com> References: <200009252317.QAA22784@freeway.dcfinc.com>
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"Chad R. Larson" wrote: > > > I did none of my devices have that address. The other server has > > another mac address with the same error massage and another unkown MAC > > address. Everythings running fine except for the messages. I have > > remote logging and there seems to be no unkown logins etc. I'm > > stumped. Could this be an IPv6 error? > > No, someone out on your cable segment has mis-configured his > firewall/router to put the private addresses on the public network. > > When your system "ifconfig"s its interface, it sends out an ARP for > it's own address. It does this for two reasons. One is to update > the ARP caches on all other machines on your collision domain. The > other is to see if some other machine thinks =it= owns that IP > address. You're tripping over that second problem. > > Put another way, there are more than one machine (your's being one) > in the collision domain that think they own the 192.168.1.1 IP > address, and the other one has a MAC address of 00:10:b5:6c:33:83. > > I say on your cable segment, because the LANcity modem acts as a > MAC-level bridge. I don't think the ADSL modem will. > > Do you have a firewall between your LAN and the cable modem? It > shouldn't let any of the private (RFC-1631) addresses in. > > -crl I thought I did. I will tighten it up a bit. It is very minimal. Mostly to prevent spoofing and the like. Thanks. Now it all makes sense. -- Ted Sikora Jtl Development Group tsikora@powerusersbbs.com Linux the choice of a GNU generation............ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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