Can't Find RT-AC86U Wifi Data Chanel Number

djmcfar

Occasional Visitor
In wifi monitor mode using wireshark - able to display packets from other devices but no packets other multicast and the like. No application data like web browsing. Thanks in advance.
 

ColinTaylor

Part of the Furniture
This is normal. Unless you have a WiFi adapter capable of capturing raw WiFi packets off-air you're not going to see unicast traffic for other devices. Even if you do have such an adapter you won't be able to see the user data because it's encrypted.
 
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djmcfar

Occasional Visitor
Thanks for your reply Colin. I ordered an Atheros AR9271 2.4 Ghz USB WiFi Wireless Adapter, which will do the trick.

If I may add a side question... When a create a tcpdump capture file on the router, syncing and verifying file contents, then remove the USB2 stick from the USB2 slot and take it to another machine for viewing with Wireshark, sometimes the file is not present for viewing. This happens about 50% of the time. Attempts to unmount the USB2 drive before removing it from the router (to hopefully avoid this problem) always fail with "can't unmount /tmp/mnt/RT-AC86U: Device or resource busy" regardless of using the block device name or the directory path, and I don't have any other processes wanting access to the USB (tcpdump is terminated before this, and the terminal's path is not within the mount point). Is there anyway to ensure that files created on USB persist when the USB drive is removed ?
 

ColinTaylor

Part of the Furniture
I can't think why you can't unmount the drive if nothing is using it. Bear in mind that "using" includes processes that have a directory on that disk as their current working directory. So make sure you haven't cd'd into a directory on the disk (maybe that's what you meant by "terminal's path"). Do a cd / before unmounting.
 

djmcfar

Occasional Visitor
Do a cd / before unmounting.
Already tried that and there's nothing on the USB except for the entware directory. I doubt if there's a process using anything on there. There might be some info about that in /proc but that's a lot of trouble to go through in order to unmount the device. I'll look for alternative ways of file transfer that don't involve removing the USB...
 

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