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Retransmmision of packets

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Hi, communtiy,

Currently we have a cluster with 6400 devices, where when performing various packet captures we notice that we see several retransmissions of packets on several interfaces. We have already checked the drop counters (rx and tx), overruns (tx and rx) , revision with ethtool, revision of the history with cpview tool, interface speed synchronization and even applied a debug for drop packets and all is well.
My question is, can the cluster really retransmit packets or do they really come from other equipment (switches, router, balancer)? , so we noticed that a device in front of the fw has an mtu of 1548 and the fw of 1500, could this be a real cause?

.......mmmmm any idea what could be investigated before involving the TAC?



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