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My Personal Collection of IPv6 Notes

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IPv6 is the future of networking and will soon replace IPv4. That's what we have been hearing for quite some time now. It must be acknowledged that the complete migration to IPv6 is taking longer than expected. While we can say that the progress is still slow, we are witnessing a concrete increase in the number of IPv6 addresses objectively used. Here, I will present various notes about IPv6. I hope these notes can be useful for others, and perhaps even for you!



Adresses IPv6 IPv4 Notes
Link-local address fe80::/10 Address autoconfiguration
Unique local address fc00::/7 Addresses analogous to IPv4 private network addresses.
Global Monodiffusion 2000::/3 Public IP
Multicast address ffx2::/16 ff02::1 : All nodes on the local network segment, ff02::2 : All routers on the local network segment


In IPv6, ARP has been replaced by NDP (Neighbor Discovery Protocol).


  • Structure:
# /64 : 2001:db8:0000:0000:0000:0000:0000:0001 _____________|____|___________________ network ID subnet interface ID

Note : The network ID is determined by your ISP when you receive a block of real IPv6 addresses. You control the subnet and interface.

Real-world Usage


  • Assign ip address to an interface:
root@host:~# ip -6 addr add 2001:0db8::1/64 dev eth0
  • Delete ip address:
root@host:~# ip -6 addr del 2001:0db8::1/64 dev eth0
  • Add route:
root@host:~# ip route add 2001:db8::3/64 dev eth0
  • Add default route:
root@host:~# ip -6 route add default via 2001:db8::1a
  • Show routes table:
root@host:~# ip -6 route show
  • DHCP to an interface:
root@host:~# dhcp -6 eth0
  • Disable IPv6:
root@host:~# sysctl -w net.ipv6.conf.all.disable_ipv6=1 root@host:~# sysctl -w net.ipv6.conf.all.autoconf=0 root@host:~# sysctl -w net.ipv6.conf.default.disable_ipv6=1 root@host:~# sysctl -w net.ipv6.conf.default.autoconf=0
  • /etc/network/interfaces:
iface eth0 inet6 static address 2001:db8::1/64 gateway fe80::dead:beaf
  • Enable IPv6 routing:
root@host:~# sysctl -w net.ipv6.conf.all.forwarding=1 root@host:~# cat /proc/sys/net/ipv6/conf/eth0/forwarding
  • Checking for IPv6 Machines in your LAN:
root@host:~# ping -6 -c4 ff02::1%eth0
  • Displaying the Neighbor Table (ARP Equivalent):
root@host:~# ip -6 neigh show
  • ssh:
root@host:~# ssh user@fe80::dead:beaf%eth0
  • scp to /tmp/ directory:
root@host:~# scp FILE user@\[fe80::dead:beaf%eth0\]:/tmp/
  • xfreerdp:
root@host:~# xfreerdp /ipv6 /v:[fe80::dead:beaf%eth0]


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