Date: Wed, 24 Jan 2007 10:24:11 -0800 From: Chuck Swiger <cswiger@mac.com> To: Ilia Gorstkin <cadavo@mail.ru> Cc: freebsd-stable@freebsd.org Subject: Re: arp: unknown hardware address format Message-ID: <B509587A-29DE-4D9F-8ECD-87A50EA05C19@mac.com> In-Reply-To: <45B751E0.5080907@mail.ru> References: <45B751E0.5080907@mail.ru>
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On Jan 24, 2007, at 4:32 AM, Ilia Gorstkin wrote: > I'm having trouble with arp: > arp: unknown hardware address format (0x4500) > and > arp: unknown hardware address format (0x4242) > these messages fall on the console in a plenty. > > I do tcpdump -exn "arp[0]=0x45 and arp[1]=0": > > tcpdump: verbose output suppressed, use -v or -vv for full protocol > decode > listening on xl0, link-type EN10MB (Ethernet), capture size 68 bytes Please run "tcpdump -exxn -s 0 arp" to show the full packets including link-layer headers. You should be seeing a byte sequence more like: 0001 0800 0604 0001 ...followed by the sender's MAC address. This is from /usr/include/net/if_arp.h and means: ARPHRD_ETHER, ETHERTYPE_IP, hln=6, pln=4, ARPOP_REQUEST I don't know what 0x4500 means, but 0x4242 is: #define ETHERTYPE_PCS 0x4242 /* PCS Basic Block Protocol */ It seems more likely that you've got a hardware problem like a wacked out NIC or switch, or some really odd software bug... -- -Chuck
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