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receive packets in double


From: "Manu" <traqueur () club-internet fr>
Date: Thu, 1 Apr 2010 11:17:50 +0200

Hello

I'm running wireshark 1.2.6 on a DELL W2K3 SP2 server

I've to check communication between the server and a badge readers on the 
network

When i'm asking the badgre reader his version (@v) i have two reply as you 
see below.

I have this only on this server.

Is there strange thing with network adapter ?

Thanks

No.     Time        Source                Destination           Protocol 
Info
      1 0.000000    192.168.10.3          192.168.10.13         UDP 
Source port: commtact-https  Destination port: commtact-https

Frame 1 (45 bytes on wire, 45 bytes captured)
    Arrival Time: Apr  1, 2010 11:10:05.844030000
    [Time delta from previous captured frame: 0.000000000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 0.000000000 seconds]
    Frame Number: 1
    Frame Length: 45 bytes
    Capture Length: 45 bytes
    [Frame is marked: False]
    [Protocols in frame: eth:ip:udp:data]
    [Coloring Rule Name: ___tmp_color_filter___01]
    [Coloring Rule String: (ip.addr eq 192.168.10.3 and ip.addr eq 
192.168.10.13) and (udp.port eq 20003 and udp.port eq 20003)]
Ethernet II, Src: Dell_0e:d2:54 (a4:ba:db:0e:d2:54), Dst: JkMicros_c0:f8:fa 
(00:90:c2:c0:f8:fa)
    Destination: JkMicros_c0:f8:fa (00:90:c2:c0:f8:fa)
    Source: Dell_0e:d2:54 (a4:ba:db:0e:d2:54)
    Type: IP (0x0800)
Internet Protocol, Src: 192.168.10.3 (192.168.10.3), Dst: 192.168.10.13 
(192.168.10.13)
    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: 31
    Identification: 0x388f (14479)
    Flags: 0x00
        0.. = Reserved bit: Not Set
        .0. = Don't fragment: Not Set
        ..0 = More fragments: Not Set
    Fragment offset: 0
    Time to live: 128
    Protocol: UDP (0x11)
    Header checksum: 0x0000 [incorrect, should be 0x6cde]
        [Good: False]
        [Bad : True]
            [Expert Info (Error/Checksum): Bad checksum]
    Source: 192.168.10.3 (192.168.10.3)
    Destination: 192.168.10.13 (192.168.10.13)
User Datagram Protocol, Src Port: commtact-https (20003), Dst Port: 
commtact-https (20003)
    Source port: commtact-https (20003)
    Destination port: commtact-https (20003)
    Length: 11
    Checksum: 0x8dba [validation disabled]
Data (3 bytes)

0000  40 76 00                                          @v.

No.     Time        Source                Destination           Protocol 
Info
      2 0.028758    192.168.10.13         192.168.10.3          UDP 
Source port: commtact-https  Destination port: commtact-https

Frame 2 (60 bytes on wire, 60 bytes captured)
    Arrival Time: Apr  1, 2010 11:10:05.872788000
    [Time delta from previous captured frame: 0.028758000 seconds]
    [Time delta from previous displayed frame: 0.028758000 seconds]
    [Time since reference or first frame: 0.028758000 seconds]
    Frame Number: 2
    Frame Length: 60 bytes
    Capture Length: 60 bytes
    [Frame is marked: False]
    [Protocols in frame: eth:ip:udp:data]
    [Coloring Rule Name: ___tmp_color_filter___01]
    [Coloring Rule String: (ip.addr eq 192.168.10.3 and ip.addr eq 
192.168.10.13) and (udp.port eq 20003 and udp.port eq 20003)]
Ethernet II, Src: JkMicros_c0:f8:fa (00:90:c2:c0:f8:fa), Dst: Dell_0e:d2:54 
(a4:ba:db:0e:d2:54)
    Destination: Dell_0e:d2:54 (a4:ba:db:0e:d2:54)
    Source: JkMicros_c0:f8:fa (00:90:c2:c0:f8:fa)
    Type: IP (0x0800)
    Trailer: A8
Internet Protocol, Src: 192.168.10.13 (192.168.10.13), Dst: 192.168.10.3 
(192.168.10.3)
    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: 45
    Identification: 0x08b7 (2231)
    Flags: 0x00
        0.. = Reserved bit: Not Set
        .0. = Don't fragment: Not Set
        ..0 = More fragments: Not Set
    Fragment offset: 0
    Time to live: 64
    Protocol: UDP (0x11)
    Header checksum: 0xdca8 [correct]
        [Good: True]
        [Bad : False]
    Source: 192.168.10.13 (192.168.10.13)
    Destination: 192.168.10.3 (192.168.10.3)
User Datagram Protocol, Src Port: commtact-https (20003), Dst Port: 
commtact-https (20003)
    Source port: commtact-https (20003)
    Destination port: commtact-https (20003)
    Length: 25
    Checksum: 0xfe82 [validation disabled]
Data (17 bytes)

0000  76 38 35 32 2e 33 34 30 2e 30 30 30 30 2e 33 35   v852.340.0000.35
0010  00                                                .

No.     Time        Source                Destination           Protocol 
Info
      3 0.028765    192.168.10.13         192.168.10.3          UDP 
Source port: commtact-https  Destination port: commtact-https

Frame 3 (60 bytes on wire, 60 bytes captured)
    Arrival Time: Apr  1, 2010 11:10:05.872795000
    [Time delta from previous captured frame: 0.000007000 seconds]
    [Time delta from previous displayed frame: 0.000007000 seconds]
    [Time since reference or first frame: 0.028765000 seconds]
    Frame Number: 3
    Frame Length: 60 bytes
    Capture Length: 60 bytes
    [Frame is marked: False]
    [Protocols in frame: eth:ip:udp:data]
    [Coloring Rule Name: ___tmp_color_filter___01]
    [Coloring Rule String: (ip.addr eq 192.168.10.3 and ip.addr eq 
192.168.10.13) and (udp.port eq 20003 and udp.port eq 20003)]
Ethernet II, Src: JkMicros_c0:f8:fa (00:90:c2:c0:f8:fa), Dst: Dell_0e:d2:54 
(a4:ba:db:0e:d2:54)
    Destination: Dell_0e:d2:54 (a4:ba:db:0e:d2:54)
    Source: JkMicros_c0:f8:fa (00:90:c2:c0:f8:fa)
    Type: IP (0x0800)
    Trailer: A8
Internet Protocol, Src: 192.168.10.13 (192.168.10.13), Dst: 192.168.10.3 
(192.168.10.3)
    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: 45
    Identification: 0x08b7 (2231)
    Flags: 0x00
        0.. = Reserved bit: Not Set
        .0. = Don't fragment: Not Set
        ..0 = More fragments: Not Set
    Fragment offset: 0
    Time to live: 64
    Protocol: UDP (0x11)
    Header checksum: 0xdca8 [correct]
        [Good: True]
        [Bad : False]
    Source: 192.168.10.13 (192.168.10.13)
    Destination: 192.168.10.3 (192.168.10.3)
User Datagram Protocol, Src Port: commtact-https (20003), Dst Port: 
commtact-https (20003)
    Source port: commtact-https (20003)
    Destination port: commtact-https (20003)
    Length: 25
    Checksum: 0xfe82 [validation disabled]
Data (17 bytes)

0000  76 38 35 32 2e 33 34 30 2e 30 30 30 30 2e 33 35   v852.340.0000.35
0010  00                                                .


Manu 

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