ping6 on samr21-xpro

Hi all,

I try to ping between 2 samr21-xpro nodes using the ng_networking example. But now this does not work anymore.

Before PR #3388 [1] has been merged the nodes generated a local /64 address like: `inet6 addr: fe80::ff:fe00:3702/64 scope: local`

now the address is: inet6 addr: fe80::585a:6667:bdbf:3702/64 scope: local

`ping6 fe80::ff:fe00:3702` works (I disabled #3388) `ping6 fe80::585a:6667:bdbf:3702` does not

Do I use a wrong destination address?

Best regards, Martin