Wireshark · Wireshark-users: [Wireshark-users] [wirshark-users]missing packet in promiscuous capture mode

["Bob Brusa" <bob.brusa@xxxxxxxxx>]

Hi
I am debugging the DHCP implementation of an embedded board. It should  
receive its address from a ZyXEL P-661HW-D3 ADSL router. Using wireshark,  
I can see that my board starts the DHCP-process, but I can not see any  
answer of the ZyXEL to my boards requests. The funny thing however is,  
that the debugging output of my board reports receipt of such an answer -  
only to drop it because it claims a checksum error. This explains why the  
DHCP process is not successful, but it does not explain why I do not see  
this packet on wireshark. I have used filters of various kind - including  
inspection by eye, packet for packet. This packet the board reports is not  
in the list of captured packet of wireshark.

The topology of my LAN is as follows:

Zyxel___Planet switch___Planet switch ____ myboard
        FSD 1600        FSD 800      |____PC #1 running wireshark
                                     |____JTAG debugger
                                     |____PC #2

Does the switch play a dirty trick? Unlikely, because I see the packets  
from my board and all those other packets going to/from the PC and JTAG  
debugger. And the DHCP-process for the two PCs was successful. Thanks for  
advice.
  Robert