Wireshark mailing list archives
Re: Basic question about Wireshark
From: Guy Harris <guy () alum mit edu>
Date: Wed, 27 Jul 2011 00:38:30 -0700
On Jul 27, 2011, at 12:13 AM, Frank Walter wrote:
Are you talking about capture filter? Unfortunately the capture filter syntax is different from display filter syntax. The capture filter not ether dest ff:ff:ff:ff:ff:ff should exclude broadcast packets.Oh no. This gives me a clear: Invalid capture filter: "not ether dest ff:ff:ff:ff:ff:ff"!
The person who said "ether dest" was wrong - it should be "ether dst": $ tcpdump -i en1 -d not ether dst ff:ff:ff:ff:ff:ff (000) ld [2] (001) jeq #0xffffffff jt 2 jf 5 (002) ldh [0] (003) jeq #0xffff jt 4 jf 5 (004) ret #0 (005) ret #65535
The "problem" is, that the display filter doesn't work. E.g. like this: !(eth.dst == ff:ff:ff:ff:ff:ff) when I am in Monitor mode.
In monitor mode, you probably have 802.11 headers rather than Ethernet headers, so it's probably !(wlan.da == ff:ff:ff:ff:ff:ff) rather than !(eth.dst == ff:ff:ff:ff:ff:ff)
And I don't know either how to filter all those packets away with another SSID.
The SSID isn't in every packet, so that's not implementable unless the 802.11 dissector were to determine the SSID corresponding to the RA or TA and put it into the 802.11 header as a "generated" field. ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe
Current thread:
- Basic question about Wireshark Frank Walter (Jul 24)
- Re: Basic question about Wireshark Boonie (Jul 24)
- Re: Basic question about Wireshark Frank Walter (Jul 24)
- Re: Basic question about Wireshark Andreas (Jul 24)
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- Re: Basic question about Wireshark Frank Walter (Jul 27)
- Re: Basic question about Wireshark Guy Harris (Jul 27)
- Re: Basic question about Wireshark news.gmane.com (Jul 28)
- Re: Basic question about Wireshark Frank Walter (Jul 28)
- Re: Basic question about Wireshark Frank Walter (Jul 24)
- Re: Basic question about Wireshark Boonie (Jul 24)
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- Re: Still unable to decode WPA2 on a MacBook francwalter (Jul 27)