Re: tcpdump - tun/tap virtual interfaces

From: Giovanni P. Tirloni (gpt_at_tirloni.org)
Date: 09/28/03

  • Next message: Robert Watson: "Re: tcpdump - tun/tap virtual interfaces" 
    Date: Sun, 28 Sep 2003 14:24:01 -0300
To: freebsd-net@freebsd.org

    * Robert Watson (rwatson@freebsd.org) wrote:

    > Do you see anything when you ping the broadcast address or other foreign
    > address of the tap interface? Packets delivered to local IP addresses
    > generally don't go out an interface.

     About Ethernet frames not going out to the wire and being sent to the
     loopback..
     
     The check seems to happen at line 291 in if_ethersubr.c and then it
     uses the if_simloop() function to copy the packet to the loopback
     interface. Is that right?

     The rcvif interface is set to the hardware device, how is this used in
     this case? What kind of checks are done to the rcvif usually?

     I haven't received my copy of Steven's Volume 2 yet so if it's
     explained there (as I hope) I will sit in my corner and wait to for it
     patiently :)

     --
     Giovanni P. Tirloni <gpt at tirloni.org>
     Fingerprint: 8C3F BEC5 79BD 3E9B EDB8 72F4 16E8 BA5E D031 5C26
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  • Next message: Robert Watson: "Re: tcpdump - tun/tap virtual interfaces"

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