On 13.09.2016 16:58, Gordon Messmer wrote: > On 09/13/2016 12:03 AM, Walter H. wrote: >> why can only the router do >> ping6 2001:db8:0815::17 >> and not the linux box? > > > It's not uncommon for systems to not route packets back out the > interface where they were received. What kind of router is this? It is a CentOS 6 box