Wireshark mailing list archives
Get "Malformed Packet" for 802.11 Beacon frames on Windows
From: Yang Luo <hsluoyb () gmail com>
Date: Tue, 12 Apr 2016 13:53:19 +0800
Hi list, I have enabled 802.11 control and management frames capture on Windows using Npcap. I found that the Beacon frames are marked as "Malformed Packet" by Wireshark 2.0.2. The false trace of the No. 40 packet is here: (BTW, is there any simple copy text method for a packet in Wireshark, like copying all the protocol tree in text like below? I manually copied all the fields and it's slow) IEEE 802.11 wireless LAN management frame Tagged parameters (213 bytes) Tag: Channel Usage Tag length: 175 Expert Info (Error/Malformed): Tag Length is longer than remaining payload Tag Length is longer than remaining payload Severity level: Error Group: Malformed The capture file with the error is: https://github.com/nmap/npcap/releases/download/v0.06-r15/npcap_beacon_error.pcapng.gz You can test this feature using this release: https://github.com/nmap/npcap/releases I'm not an expert of 802.11 protocols, so can anyone point out what's wrong here? Thanks! -------------------------------------------------------- At last I paste the usage of this release here: Usage: 1. Install npcap-nmap-0.06-r15-wifi.exe. 2. Run WlanHelper.exe with *Administrator* privilege. Type in the index of your wireless adapter (usually 0) and press Enter. Then type in 1 and press Enter to to switch on the *Monitor Mode*. 3. Launch Wireshark and capture on the wireless adapter, you will see *all 802.11 packets (data + control + management)*. 4. If you need to return to *Managed Mode*, run WlanHelper.exe again and input the index of the adapter, then type in 0 and press Enter to to switch off the **Monitor Mode*. Notice: You need to use WlanHelper.exe tool to switch on the *Monitor Mode* in order to see 802.11 control and management packets in Wireshark (also encrypted 802.11 data packets, you need to specify thedecipher key in Wireshark in order to decrypt those packets), otherwise you will only see 802.11 data packets. Switching on the *Monitor Mode* will disconnect your wireless network from the AP, you can switch back to *Managed Mode* (aka *ExtSTA* in Microsoft's terminologies) using the same WlanHelper.exe tool. Cheers, Yang
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Current thread:
- Get "Malformed Packet" for 802.11 Beacon frames on Windows Yang Luo (Apr 11)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Guy Harris (Apr 11)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Yang Luo (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Guy Harris (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Yang Luo (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Guy Harris (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Guy Harris (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Yang Luo (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Guy Harris (Apr 13)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Yang Luo (Apr 13)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Yang Luo (Apr 12)
- Re: Get "Malformed Packet" for 802.11 Beacon frames on Windows Guy Harris (Apr 11)