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Question : Packet errors
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Hello,
I'm having major network connectivity issues. I posted an article on ODBC connectivity, but it looks like it is network switch related. I would like to confirm this. I will be getting a 5 port switch and put a server, a workstation and the internet connection on it this weekend to trouble shoot to see if it is my switch. But can anyone tell from these two packet error messge from Ethereal, if it is the switch?
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No. Time Source Destination Protocol Info
130 7.475530 10.0.0.124 65.54.161.253 TCP 1443 > http [FIN, ACK] Seq=2022 Ack=419 Win=65118 [CHECKSUM INCORRECT] Len=0
Frame 130 (54 bytes on wire, 54 bytes captured)
Arrival Time: May 27, 2005 10:42:20.843963000
Time delta from previous packet: 0.000151000 seconds
Time since reference or first frame: 7.475530000 seconds
Frame Number: 130
Packet Length: 54 bytes
Capture Length: 54 bytes
Protocols in frame: eth:ip:tcp
Ethernet II, Src: 00:0f:1f:a8:a7:ac, Dst: 00:13:1a:75:5c:88
Destination: 00:13:1a:75:5c:88 (10.0.0.19)
Source: 00:0f:1f:a8:a7:ac (10.0.0.124)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.0.0.124 (10.0.0.124), Dst Addr: 65.54.161.253 (65.54.161.253)
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: 40
Identification: 0x5ccb (23755)
Flags: 0x04 (Don't Fragment)
0... = Reserved bit: Not set
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 128
Protocol: TCP (0x06)
Header checksum: 0xb055 (correct)
Source: 10.0.0.124 (10.0.0.124)
Destination: 65.54.161.253 (65.54.161.253)
Transmission Control Protocol, Src Port: 1443 (1443), Dst Port: http (80), Seq: 2022, Ack: 419, Len: 0
Source port: 1443 (1443)
Destination port: http (80)
Sequence number: 2022 (relative sequence number)
Acknowledgement number: 419 (relative ack number)
Header length: 20 bytes
Flags: 0x0011 (FIN, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...1 = Fin: Set
Window size: 65118
Checksum: 0xedc9 (incorrect, should be 0xd93c)
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No. Time Source Destination Protocol Info
141 8.326615 10.0.0.124 10.0.0.1 TCP 1231 > 3389 [ACK] Seq=596 Ack=492 Win=64092 [CHECKSUM INCORRECT] Len=0
Frame 141 (54 bytes on wire, 54 bytes captured)
Arrival Time: May 27, 2005 10:42:21.695048000
Time delta from previous packet: 0.139084000 seconds
Time since reference or first frame: 8.326615000 seconds
Frame Number: 141
Packet Length: 54 bytes
Capture Length: 54 bytes
Protocols in frame: eth:ip:tcp
Ethernet II, Src: 00:0f:1f:a8:a7:ac, Dst: 00:0c:6e:2a:66:6c
Destination: 00:0c:6e:2a:66:6c (AsustekC_2a:66:6c)
Source: 00:0f:1f:a8:a7:ac (10.0.0.124)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.0.0.124 (10.0.0.124), Dst Addr: 10.0.0.1 (10.0.0.1)
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: 40
Identification: 0x5cd1 (23761)
Flags: 0x04 (Don't Fragment)
0... = Reserved bit: Not set
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 128
Protocol: TCP (0x06)
Header checksum: 0x8982 (correct)
Source: 10.0.0.124 (10.0.0.124)
Destination: 10.0.0.1 (10.0.0.1)
Transmission Control Protocol, Src Port: 1231 (1231), Dst Port: 3389 (3389), Seq: 596, Ack: 492, Len: 0
Source port: 1231 (1231)
Destination port: 3389 (3389)
Sequence number: 596 (relative sequence number)
Acknowledgement number: 492 (relative ack number)
Header length: 20 bytes
Flags: 0x0010 (ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 64092
Checksum: 0x1497 (incorrect, should be 0x6682)
SEQ/ACK analysis
This is an ACK to the segment in frame: 140
The RTT to ACK the segment was: 0.139084000 seconds
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Thanks,
DAve
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Answer : Packet errors
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Agreed - error messages seem to indicate - inability to make a connection or reconnect.
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