Date: Tue, 16 May 1995 12:34:08 PDT From: Bill Fenner <fenner@parc.xerox.com> To: Thomas Graichen <graichen@sirius.physik.fu-berlin.de> Cc: freebsd-hackers@FreeBSD.org Subject: Re: "arp info overwritten" problem Message-ID: <95May16.123424pdt.49859@crevenia.parc.xerox.com> In-Reply-To: Your message of "Tue, 16 May 95 07:22:44 PDT." <9505161422.AA16140@sirius.physik.fu-berlin.de>
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In message <9505161422.AA16140@sirius.physik.fu-berlin.de> you write: >here i often get the "arp info overwritten for 130.133.255.255 from ..." - >aroud every 1/4 i get this and i think it's because FreeBSD keeps the >broadcast adress in his arp cache -> arp -a looks like: > >graichen@julia:~> arp -a >BROADCAST.fu-berlin.de (130.133.255.255) at 8:0:14:15:16:78 This is, of course, not the broadcast MAC address; it is the address of a device with an ethernet card manufactured by Excelan, which could be a BBN Butterfly, Masscomp, Silicon Graphics, or other. FreeBSD doesn't use the ARP table for broadcasts; arpresolve() is hardwired to return the ethernet broadcast address when it gets passed a broadcast mbuf. My only guess as to what is going on is that someone is sending a broadcasted arp reply for the broadcast address, or something bizarre like that. The only way to know for sure is to use tcpdump (try "tcpdump -v -e -n arp") and see if you ever see a line that says something like "arp reply 130.133.255.255 is-at 8:0:14:15:16:78". (p.s. what is your netmask and broadcast address on that interface?) Bill
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