[CentOS] 6.x - find interface with link up

Les Mikesell lesmikesell at gmail.com
Thu Dec 15 23:27:47 UTC 2011


On Thu, Dec 15, 2011 at 5:16 PM, Ross Walker <rswwalker at gmail.com> wrote:

>> In earlier versions 'mii-tool' would iterate over interfaces and show
>> which have link up.   In 6.x it wants an interface as a parameter.
>> What is the appropriate way to find which of some number of of
>> interfaces are connected?   Better yet, what is the least typing to
>> get the mac addresses of those interfaces?
>
> In 5 an 'ifconfig' without parameters would only list up interfaces and one would have to do an 'ifconfig -a' to see all interfaces. Maybe still true in 6?
>

That's not just 'link up' though. Those are ones that are
'administratively up' with an address assigned.  That would be the
same set with the default configuration and DHCP service available on
all subnets, but we don't have that.

-- 
   Les Mikesell
      lesmikesell at gmail.com



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