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Long distance between WDS/Mesh AP's causes a retransmission even after the receiving AP acknowledged the frame

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Information

 
TitleLong distance between WDS/Mesh AP's causes a retransmission even after the receiving AP acknowledged the frame
Symptoms
TXRX: AES CCMP PN check failed message seen in the AP log, WDS/Mesh link unstable
 
Oct 19 12:45:01 kernel: TXRX: AES CCMP PN check failed - TID 0, peer ca32c800 (aa:bb:cc:dd:ee:ff) ucast
Oct 19 12:45:01 kernel:     old PN = 0x00ce72aa (LSBs = 13529770)
Oct 19 12:45:01 kernel:     new PN = 0x00ce72a4 (LSBs = 13529764)
Oct 19 12:45:01 kernel:     new seq num = 670, sec_type=6

 
Environment
  • identiFi wireless
  • AP3865e
  • 2.8Km WDS link
  • Low data rates observed
  • RSSI good
  • LDPC on
Cause
A retransmission occurred even after the receiving AP acknowledged the frame
Resolution
  1. Upgrade to 10.31.01 or higher
  2. Set maximum distance in AP radio properties to reflect the distance between the AP's
Additional notes

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