After upgrading to Natty Narwhal I noticed there is much traffic on my lan, because the leds on my switch are blinking constantly without any internet or local network activity I knew of. I took a look using wireshark and noticed that my pc is broadcasting a few times per second always from and to the same port 19375. The data contains a human readable string "whoisthere", so I suspect it may be some discovery protocol for a networking service.
Searching the net didn't give me any clues. So maybe somebody here knows what is cluttering my lan (and wlan) with broadcasts. Also how could this request be so urgent that it has to be done several times per second? The process list didn't show me any suspect process I would try to stop.
Below I post one of the packets as extracted with wireshark:
Code:
No. Time Source Destination Protocol Info
138 5.144065 192.168.1.33 192.168.1.255 UDP Source port: 19375 Destination port: 19375
Frame 138: 80 bytes on wire (640 bits), 80 bytes captured (640 bits)
Arrival Time: Mar 17, 2012 22:41:30.018078000 CET
Epoch Time: 1332020490.018078000 seconds
[Time delta from previous captured frame: 0.043571000 seconds]
[Time delta from previous displayed frame: 0.043571000 seconds]
[Time since reference or first frame: 5.144065000 seconds]
Frame Number: 138
Frame Length: 80 bytes (640 bits)
Capture Length: 80 bytes (640 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ip:udp:data]
[Coloring Rule Name: UDP]
[Coloring Rule String: udp]
Ethernet II, Src: AbitComp_b2:19:de (00:50:8d:b2:19:de), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Destination: Broadcast (ff:ff:ff:ff:ff:ff)
Address: Broadcast (ff:ff:ff:ff:ff:ff)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
Source: AbitComp_b2:19:de (00:50:8d:b2:19:de)
Address: AbitComp_b2:19:de (00:50:8d:b2:19:de)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IP (0x0800)
Internet Protocol, Src: 192.168.1.33 (192.168.1.33), Dst: 192.168.1.255 (192.168.1.255)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 66
Identification: 0x0000 (0)
Flags: 0x02 (Don't Fragment)
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: UDP (17)
Header checksum: 0xb63a [correct]
[Good: True]
[Bad: False]
Source: 192.168.1.33 (192.168.1.33)
Destination: 192.168.1.255 (192.168.1.255)
User Datagram Protocol, Src Port: 19375 (19375), Dst Port: 19375 (19375)
Source port: 19375 (19375)
Destination port: 19375 (19375)
Length: 46
Checksum: 0x1b56 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Data (38 bytes)
Data: 77686f69737468657265003139322e3136382e312e333300...
[Length: 38]
0000 ff ff ff ff ff ff 00 50 8d b2 19 de 08 00 45 00 .......P......E.
0010 00 42 00 00 40 00 40 11 b6 3a c0 a8 01 21 c0 a8 .B..@.@..:...!..
0020 01 ff 4b af 4b af 00 2e 1b 56 77 68 6f 69 73 74 ..K.K....Vwhoist
0030 68 65 72 65 00 31 39 32 2e 31 36 38 2e 31 2e 33 here.192.168.1.3
0040 33 00 32 35 35 2e 32 35 35 2e 32 35 35 2e 30 00 3.255.255.255.0.
Best Greetings!
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