While using Ethereal to follow up on an H323 issue, I have noticed that
all ooh323 TCP packets from an Asterisk server have incorrect checksums.
TCP packets from other services on this box are fine.
Header from an H.225 setup packet:
Transmission Control Protocol, Src Port: 12077 (12077), Dst Port:
h323hostcall (
1720), Seq: 1, Ack: 1, Len: 199
Source port: 12077 (12077)
Destination port: h323hostcall (1720)
Sequence number: 1 (relative sequence number)
Next sequence number: 200 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 20 bytes
Flags: 0x0018 (PSH, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 1... = Push: Set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x8235 [incorrect, should be 0xe694]
Header from H.245 teminalCapabilitySet packet:
Transmission Control Protocol, Src Port: 12078 (12078), Dst Port: 1729
(1729), S
eq: 1, Ack: 56, Len: 43
Source port: 12078 (12078)
Destination port: 1729 (1729)
Sequence number: 1 (relative sequence number)
Next sequence number: 44 (relative sequence number)
Acknowledgement number: 56 (relative ack number)
Header length: 20 bytes
Flags: 0x0018 (PSH, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 1... = Push: Set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x8199 [incorrect, should be 0x221e]
Regards,
Richard
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