From: gtaylor@tnetconsulting.net   
      
   On 3/19/20 4:22 AM, Mirko wrote:   
   > They have the internal/ private lan interfaces with private IP ,   
   > and one public throught PPPoE .   
      
   That is very common.   
      
   It is possible to have public / globally routed IPs on the LAN.   
      
   > I know, using a packet sniffer as wireshark or airodump it's visible   
   > the MAC address of a AP router.   
      
   Yep.   
      
   > It's different from ethernet interface ( they have typically 4 ethernet   
   > port with the same MAC).   
      
   I'm not sure what you're referring to here.   
      
   I can't tell if it's the fact that wireless frames have 3 or sometimes 4   
   MAC addresses, or something about seeing the same mac from multiple   
   ports on a switch (or hub).   
      
   > How may I know the MAC address inside PPPoE frames?  AP/routers don't   
   > indicate MAC address of the public interface.   
      
   It is highly dependent on the router.  Some may expose it somewhere in   
   the management interface.  Some may require running a command on the router.   
      
   You may be able to get your ISP to provide it.   
      
   Depending on the router, you may be able to hook a sniffer up to the   
   outside / public interface of the router.   
      
   > They have same version of linux/BSD embedded, a small web server,   
   > and a little shell like busybox accesible via telnet.   
      
   I don't think I've heard of any SOHO routers that have any BSD varient.   
   I've heard of plenty distros that you can install on an old computer   
   that run one BSD or another.   
      
   Linux and VXWorks seem to be quite common.   
      
   > Thanks   
      
   You're welcome.   
      
      
      
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   Grant. . . .   
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