| 73 | 71 | The standard ping and ''/usr/sbin/arping'' tools are useful for debugging connectivity (but make sure your controller passes ''ICMP ECHO REQUEST'' and ''REPLY'' packets and ''ARP'' traffic, respectively!), and the command ''netstat -an'' will show all active network connections on a Unix host; the TCP connections of interest in this exercise will be at the top of the listing. The format of netstat output is out of the scope of this tutorial, but information is available online and in the manual pages. |
