capture traffic on an access point

asked 2019-02-18 12:15:18 +0000

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We are having some problems at my Bridge club where we use tablets to do scoring. The result of a hand is sent over wifi to the scoring machine but sometimes a tablet reports "no response" and we usually have to turn wifi off and on on a tablet to get it to work again.

I would like to use wireshark to capture the transaction between a tablet and an access point when it goes wrong. I can find out the IP address of the access point and the tablet and I know how to filter in wireshark but how do I tell wireshark to monitor the traffic on the remote access point. I assume my laptop needs to be connected to the same LAN as the access point.

By the way, I tried wireshark out at my home with the Bridge scoring software running and my tablet reported an error - it didn't get the feedback from the scoring machine that it was supposed to. When I looked in wireshark it said "TCP out of order" i.e. wireshark reported the fault and it was a real fault. Any idea what this fault means? I wouldn't have thought this was possible - TCP should retry and get the data through but it didn't and the tablet reported "no response".

Thanks for any help.

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Comments

You would need AirPcap to capture wireless traffic between your AP and a tablet. Alternatively some WiFi adapters can be set to monitor mode in Linux.
Linux compatible USB adapters

AirPcap link

net_tech gravatar imagenet_tech ( 2019-02-18 12:45:59 +0000 )edit

thank you so TP-Link TL-WN722N V1 Atheros AR9271 2.4GHz 802.11N External is our choice since other models are less known

darius gravatar imagedarius ( 2019-02-18 12:56:52 +0000 )edit

@net_tech Thanks

atom gravatar imageatom ( 2019-02-18 20:24:04 +0000 )edit

Is the comment from darius spam?

atom gravatar imageatom ( 2019-02-18 20:24:26 +0000 )edit