Jorik.Jonker at eu
Apr 8, 2011, 1:52 AM
Post #1 of 2
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Suspicious broadcast packets
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Hi all,
A supplier reports that one of the XMR4000's we administer for a customer is violating port security. Further investigation shows that the switch seems to have developed a habit to send suspicious broadcast packets to this supplier to and from a strange mac address [1]. It is very odd, since source/destination contain "parts" of the chassis mac (001b.edb1.1600), with a little bit shift in it.
Is this some protocol we should have turned off, or could it be that a part of the switch is loosing itself?
Best regards,
Jorik Jonker
[1]:
Ethernet II, Src: 16:00:08:06:00:01 (16:00:08:06:00:01), Dst:ff:ff:00:1b:ed:b1 (ff:ff:00:1b:ed:b1)
Destination: ff:ff:00:1b:ed:b1 (ff:ff:00:1b:ed:b1)
Address: ff:ff:00:1b:ed:b1 (ff:ff:00:1b:ed:b1)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
Source: 16:00:08:06:00:01 (16:00:08:06:00:01)
Address: 16:00:08:06:00:01 (16:00:08:06:00:01)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
Type: IP (0x0800)
Trailer: 040001001BEDB11600D9AA1384000000000000D9AA138400...
Internet Protocol
Version: 0
Header length: 24 bytes
Differentiated Services Field: 0x04 (DSCP 0x01: Unknown DSCP; ECN:0x00)
0000 01.. = Differentiated Services Codepoint: Unknown (0x01)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total length: 1 bytes (bogus, less than header length 24)
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