CentOS - Dec 2020 - CentOS 7, as a 6in4 server

Hello,

I have a VPS at a hoster where I got 3 /64 ipv6 prefixes/subnets, that 
are routed;

one for the VPS itself? - let us call this? srvprefix
one for the tunnel, only ::1 (server side) and ::2 (home side) are used 
- let us call this tunnelprefix
and one for my network at home - let us call this homeprefix

now I'm just in test state, a CentOS VM is the other end of the tunnel;
(when the server runs well, my CentOS ZBOX will become the other end of 
the tunnel)

at the server

the eth0 device has? serverprefix::1, the sit1 device has tunnelprefix::1

the routing is set with /etc/sysconfig/network-scripts/route6-sit1

tunnelprefix::2 dev sit1
homeprefix::/64 via tunnelprefix::2 dev sit1

in sysctl.conf these are set

net.ipv6.conf.all.forwarding = 1
net.ipv6.conf.all.proxy_ndp = 1

now I have to do these

ip -6 neigh add proxy homeprefix::1 dev eth0
ip -6 neigh add proxy homeprefix::### dev eth0

the question, can I do something to avoid these "ip -6 neigh ..."? if 
yes, what? and how?
can the hoster do something? if yes, what?

Thanks,

Walter

my ISP told me that he won't deploy IPv6 within the next 5 years;

On 12/1/20 8:39 PM, Walter H. wrote:
> I have a VPS at a hoster where I got 3 /64 ipv6 prefixes/subnets, that are
routed;
> 
> one for the VPS itself? - let us call this? srvprefix
> one for the tunnel, only ::1 (server side) and ::2 (home side) are used -
let us call this tunnelprefix
> and one for my network at home - let us call this homeprefix
> 
> now I'm just in test state, a CentOS VM is the other end of the tunnel;
> (when the server runs well, my CentOS ZBOX will become the other end of the
tunnel)
> 
> at the server
> 
> the eth0 device has? serverprefix::1, the sit1 device has tunnelprefix::1
> 
> the routing is set with /etc/sysconfig/network-scripts/route6-sit1
> 
> tunnelprefix::2 dev sit1
> homeprefix::/64 via tunnelprefix::2 dev sit1
> 
> in sysctl.conf these are set
> 
> net.ipv6.conf.all.forwarding = 1
> net.ipv6.conf.all.proxy_ndp = 1
> 
> now I have to do these
> 
> ip -6 neigh add proxy homeprefix::1 dev eth0
> ip -6 neigh add proxy homeprefix::### dev eth0
> 
> the question, can I do something to avoid these "ip -6 neigh
..."? if yes, what? and how?
> can the hoster do something? if yes, what?
I may be missing something, but you have 3 different networks,
shouldn't you just configure routing instead of using proxy_ndp?

Regards.

-- 
    Roberto Ragusa    mail at robertoragusa.it