docs/146521: Update IPv6 system handbook section to mention ping6

[Andy Smith]

>Number:         146521
>Category:       docs
>Synopsis:       Update IPv6 system handbook section to mention ping6
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-doc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          update
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 12 16:00:13 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Andy Smith
>Release:        NA
>Organization:
>Environment:
NA
>Description:
I believe it would be useful to make some mention of the fact ping6 is required to  ping IPv6 IP addresses in the IPv6 section of the handbook:

http://www.freebsd.org/doc/en/books/handbook/network-ipv6.html

Also might be worth mentioning nslookup by default will not search for AAAA records (yep I know its deprecated but bet its still used more often than any other DNS lookup tool).
Id say these are worth mentioning as other OSs don´t necessarily behave the same way and this can be confusing for those who have to manage multiple OSs. IE solaris doesnt have a ping6 command, but Linux does etc....

thanks Andy.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: