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10-25-2021 09:47 PM
Hi Guys,
What is Out of Sequence frame and where can we look this in our cisco router?
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10-25-2021 11:12 PM
Yes. also due to application level TCP issues this can occur.
rate this and mark as answer if this solved your concern
Good luck
KB
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10-25-2021 10:13 PM - edited 10-25-2021 10:26 PM
'TCP out-of-order' - This occurs when a packet is seen with a sequence number lower than the previously received packet on that connection
from wiki:
out-of-order delivery is the delivery of data packets in a different order from which they were sent. Out-of-order delivery can be caused by packets following multiple paths through a network, by lower-layer retransmission procedures (such as automatic repeat request), or via parallel processing paths within network equipment that are not designed to ensure that packet ordering is preserved. One of the functions of TCP is to prevent the out-of-order delivery of data, either by reassembling packets in order or requesting retransmission of out-of-order packets.
You can use 'monitor capture' on router or wireshark capture at one end of the tcp session
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10-25-2021 11:04 PM
When will we see this OOS frame? Is this frame seem because of poor quality of the link?
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10-25-2021 11:12 PM
Yes. also due to application level TCP issues this can occur.
rate this and mark as answer if this solved your concern
Good luck
KB
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10-25-2021 11:20 PM
It can be caused by multiple paths between source and destination - and one travels a through a longer path.
also it might happen due to network problems or an interruption in capture.
