Tag Archives: tcpdump

Debugging Mac OS X DNS – tcpdump

Need to debug a slow Internet connection in OS X? Or simply have a desire to watch incoming and outgoing DNS (domain name service) queries in Leopard? Then tcpdump is your friend. Open a terminal window and use the following command: sudo tcpdump -i en1 -s 128 port 53 -i Sets which interface to listen… Read More »