On Wednesday, January 16, 2002, at 02:26 PM, Flowers, Jay wrote:
> I have been experimenting with writing a sniffer in Perl. While > testing the > script I received the packet below. The ScrMac is of my layer3 switch > and I > do not know the DestMAC. This has me worried. I have tried Analyzer, > Ethereal, Optimal, and Tcpdump but they drop the packet for some reason > (this is an assumption; I never see the packet in their output). Any > insight would be great. > > > ScrMAC: 000628a08e07 DestMAC: 01000ccccccc > Data: It doesn't appear to be dangerous. The destination address, "01000ccccccc", is a multicast address belonging to Cisco. I would guess it is something like a "Hey, cisco routers, anyone else here" or "Hey, I'm a cisco routers; what's up" kind of message. You could check out your cisco routers and verify that one of them is the sender. Regards, Justin > 00 01 02 03 04 05 06 07 - 08 09 0A 0B 0C 0D 0E 0F > 0123456789ABCDEF > > 00000000 01 00 0C CC CC CC 00 06 - 28 A0 8E 07 01 45 AA AA > ........(....E.. > 00000010 03 00 00 0C 20 00 01 B4 - 7F 49 00 01 00 19 4D 61 .... > ....I....Ma > 00000020 69 6E 53 77 69 74 63 68 - 2E 63 68 63 73 69 69 2E > inSwitch.chcsii. > 00000030 63 6F 6D 00 02 00 11 00 - 00 00 01 01 01 CC 00 04 > com............. > 00000040 C0 BE 01 01 00 03 00 11 - 46 61 73 74 45 74 68 65 > ........FastEthe > 00000050 72 6E 65 74 31 00 04 00 - 08 00 00 00 03 00 05 00 > rnet1........... > 00000060 E4 43 69 73 63 6F 20 49 - 6E 74 65 72 6E 65 74 77 .Cisco > Internetw > 00000070 6F 72 6B 20 4F 70 65 72 - 61 74 69 6E 67 20 53 79 ork > Operating > Sy > 00000080 73 74 65 6D 20 53 6F 66 - 74 77 61 72 65 20 0A 49 stem > Software > .I > 00000090 4F 53 20 28 74 6D 29 20 - 4C 33 20 53 77 69 74 63 OS (tm) L3 > Switc > 000000A0 68 2F 52 6F 75 74 65 72 - 20 53 6F 66 74 77 61 72 h/Router > Softwar > 000000B0 65 20 28 43 41 54 32 39 - 34 38 47 2D 49 4E 2D 4D e > (CAT2948G-IN-M > 000000C0 29 2C 20 56 65 72 73 69 - 6F 6E 20 31 32 2E 30 28 ), Version > 12.0( > 000000D0 37 29 57 35 28 31 35 64 - 29 20 20 52 45 4C 45 41 7)W5(15d) > RELEA > 000000E0 53 45 20 53 4F 46 54 57 - 41 52 45 20 0A 43 6F 70 SE SOFTWARE > .Cop > 000000F0 79 72 69 67 68 74 20 28 - 63 29 20 31 39 38 36 2D yright (c) > 1986- > 00000100 32 30 30 30 20 62 79 20 - 63 69 73 63 6F 20 53 79 2000 by > cisco > Sy > 00000110 73 74 65 6D 73 2C 20 49 - 6E 63 2E 0A 43 6F 6D 70 stems, > Inc..Comp > 00000120 69 6C 65 64 20 4D 6F 6E - 20 30 35 2D 4A 75 6E 2D iled Mon > 05-Jun- > 00000130 30 30 20 31 36 3A 31 36 - 20 62 79 20 69 6E 74 65 00 16:16 by > inte > 00000140 67 00 06 00 12 63 69 73 - 63 6F 20 43 61 74 32 39 g....cisco > Cat29 > 00000150 34 38 47 48G > > > thanks > > Jay Flowers > Integic Health Care > > > > _______________________________________________ > Ethereal-users mailing list > [EMAIL PROTECTED] > http://www.ethereal.com/mailman/listinfo/ethereal-users > > -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | When LuteFisk is outlawed | Only outlaws will have | LuteFisk *--------------------------------------*-------------------------------* - This is the TCPDUMP workers list. It is archived at http://www.tcpdump.org/lists/workers/index.html To unsubscribe use mailto:[EMAIL PROTECTED]?body=unsubscribe
