• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-comparison_of_dhcpv6_to_radvd
• https://lum0smaxima.wordpress.com/blog/
• https://lum0smaxima.wordpress.com/2016/06/24/setting-up-a-dhcp-server-for-ipv6/
• https://serverfault.com/questions/297714/how-to-configure-radvd-dhcpd6-routing-and-64-subnet-based-on-delegated-prefix
• http://sophiedogg.com/radvd-and-dhcpd6-server-configuration-for-dynamic-dns/
• https://superuser.com/questions/1046232/whats-better-radvd-or-dhcpv6-for-local-network-with-ipv6
• http://test-ipv6.com/
• https://serverfault.com/questions/205040/accessing-the-dnatted-webserver-from-inside-the-lan
• https://unix.stackexchange.com/questions/282086/how-does-nat-reflection-nat-loopback-work
• https://serverfault.com/questions/55611/loopback-to-forwarded-public-ip-address-from-local-network-hairpin-nat
• sudo vim /etc/netplan/network.yaml
• netplan generate (to test)
• netplan apply

https://www.tomicki.net/ipv6.router.php https://netplan.io/examples https://www.e2enetworks.com/help/knowledge-base/how-to-assign-ipv6-on-ubuntu-server/ https://subatomicsolutions.org/8-freebsd/17-isc-dhcp-ipv4-ipv6-server-on-a-dual-stack-network https://blog.marquis.co/configuring-a-dual-stacked-dhcp-server/ http://sophiedogg.com/radvd-and-dhcpd6-server-configuration-for-dynamic-dns/

• modprobe ipv6
• ip tunnel add he-ipv6 mode sit remote 216.218.142.50 local 112.213.222.19 ttl 255
• ip link set he-ipv6 up
• ip addr add 2001:470:1f2c:20c::2/64 dev he-ipv6
• ip route add ::/0 dev he-ipv6
• ip -f inet6 addr

https://wiki.nftables.org/wiki-nftables/index.php/Quick_reference-nftables_in_10_minutes sudo nft add rule inet firewall forward iifname “he-ipv6” counter jump base_checks sudo nft add rule inet firewall forward iifname “br0” oifname “he-ipv6” counter accept

• IPv4 list network neighbors: arp -a
• IPv6 list network neighbors: ip -6 neigh show
• MS Windows list IPv6 neighbors: netsh int ipv6 show neigh
• Standard systemd nftables configuration file location: sudo vim /etc/nftables.conf
• List all defined nftables tables: sudo nft list tables
• List a specific nftables table definition: sudo nft list table inet firewall -a -n -nn
• List a specific nftables table definiton: sudo nft list table ip nat -a
  • -a is list handles
  • -n is ?
  • -nn is ?
• Delete a specific rull by handle: sudo nft delete rule ip nat postrouting handle 12
• Delete a specific rull by handle: sudo nft delete rule inet firewall forward handle 32
• Add a speecific rull after a handle: sudo nft add rule inet firewall input position 39 tcp dport domain counter

Linux Router Background