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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