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
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--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | When LuteFisk is outlawed
| Only outlaws will have
| LuteFisk
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