[c-nsp] pingalias with a variable

[Brian Foulks]

Hello,

We have a Cisco network that utilizes DMVPN.  When
our operators use ping, they have to use the
extended ping command because ping tries to go out
the T1 interface instead of the tunnel.  Is there a
way to make an alias command for ping that would
allow us to type any IP and it automatically be set
with the source of the router's loopback? 

Thanks,

Brian