Berkeley CSUA MOTD:Entry 36212
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2026/07/26 [General] UID:1000 Activity:popular
7/26    

2005/2/17 [Computer/Networking] UID:36212 Activity:nil
2/17    IP/UDP question. How do packet sniffers work? The OS takes care of
        low level ethernet card stuff and filters out UDP/TCP before they even
        redirect those packets to applications, so how do sniffers by-pass
        this mechanism? I'm asking because I'd like to write a sniffer in
        Java and I'm not even sure if Java can specify low level ethernet
        frame details and by-pass the filtering/classification process. ok thx.
        \_ In unix you put a card into promiscuous mode (look at how tcpdump
           does it.)  Unter Windows look into NDIS--it only allows "raw"
           access to the if for some drivers/hardware.  This is why there are
           no good passive wifi scanners under Windows (correct me if I'm
           wrong, please.)  -John
2026/07/26 [General] UID:1000 Activity:popular
7/26    

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