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TCP SYN packet not send after ARP

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TCP SYN packet not send after ARP

Subject: TCP SYN packet not send after ARP
From: Remco Poelstra <email@hidden>
Date: Wed, 22 Dec 2010 10:37:06 +0100

Hi,

I'm using CFCreateSocketPairToHost to establish a TCP connection to another host. A lot of times the connection failes with a timeout. The TCP system sends out an ARP request, which is answered by the device, but after the answer, the TCP SYN packet is never send. Currently I've solved the problem by reading the ARP cache and when the MAC address is missing, I perform a system("ping -t 1 <ip>");. I do not believe this is an elegant solution. How can I make sure that after the ARP, the connection is established? I'm running an iOS App in the simulator on Snow Leopard (but on the actual device the same behaviour is reported).

Thanks in advance.

Kind regards,

Remco Poelstra
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