Hello Robert,

Have you tested TCP/IP 5.10 components? Please install the latest QNX 4 Product Suite CD 2015 and and updated Tcpip 
manager from the following web page:

http://community.qnx.com/sf/wiki/do/viewPage/projects.qnx4/wiki/LatestSoftwareUpdates

Respectfully,
Oleg

23 февр. 2018 г., в 1:51, Robert McGaughey <community-noreply@qnx.com> написал:

> We have experienced several cases where QNX 4.25 did not ACK incoming TCP packets nor did it transmit any new TCP 
packets while an ARP refresh was in progress.  We noticed this behavior because we also encountered a problem with our 
remote device where the driver stopped processing incoming messages for 31 seconds.  
> 
> From the Wireshark analysis, it appears as if the ARP mechanism in TCPIP 5.0 on QNX 4.25 deletes the ARP table cache 
entry when it expires, sends an ARP broadcast request, and waits until it receives the response back from the remote 
device before it allows any TCP messages to be transmitted.  Can anyone confirm if this is expected behavior for the ARP
 refresh on QNX 4.25 or have we encountered another bug in the TCP/IP stack?
> 
> Thanks,
> 
> Robert
> 
> 
> 
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