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3727145 - TCP packets not being acknowledged by the receiver

Symptom

  • The MSS value negotiated during the handshake (SYN → SYN-ACK → ACK) is greater than 1460.
  • Large TCP frames (jumbo frames) are sent and retransmitted.
  • Large frames are not acknowledged, the ACK number does not increase according to the segment length of the large frames.

For example:

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.


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Environment

Customer network infrastructure

Keywords

TCP, tcpdump, jumbo, MSS, retransmission, ACK , KBA , BC-NET , Obsolete - Formerly used for network tests , Problem

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