using 11.x.x.x subnet for vpn

Hi there,
im desining a dmvpn cisco tunnel and wanted to know if there is any harm in selecting 11.x.x.x subnet ? would this in any way effect or conflict with the public I.P's 11.x.x.x at all ?
nabeel92Asked:
Who is Participating?
 
JFrederick29Commented:
From a technical standpoint, nothing.  As long as it remains in the tunnel you are fine but it is simply bad practice.  There is plenty of private address space available to use.
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JFrederick29Commented:
You shouldn't use publicly registered address space that you don't "own".  You should use the RFC1918 address space:

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
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nabeel92Author Commented:
hmm..ok i will change the subnet from 11.x.x.x to 10.0.5.x/24 ?
But just out of curiosity if i may ask, whats the downside if we use a public routable I.P in our tunnel ?
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