Ipv6
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nmcli connection modify bahnhof ipv6.method dhcp nmcli connection modify bahnhof ipv6.addr-gen-mode eui64 nmcli connection modify bahnhof ipv6.dhcp-duid ll nmcli connection modify bahnhof ipv6.dhcp-iaid 123456 nmcli connection modify bahnhof ipv6.never-default no # sudo sysctl net.ipv6.conf.enp5s0.accept_ra=1 sudo sysctl net.ipv6.conf.all.accept_ra=1 sudo sysctl net.ipv6.conf.default.accept_ra=1 nmcli connection show bahnhof | grep -E "ipv6.method|ipv6.addr-gen-mode|ipv6.dhcp-duid|ipv6.dhcp-iaid|ipv6.never-default" * # ipv6 troubleshooting. # ndp Neighbor Discovery Protocol # ra Router Advertisements # pd Prefix Delegation # The IPv6 address ff02::2 is a multicast address. Specifically, it is the all-routers multicast address for the link-local scope. sudo rdisc6 <interface> sudo rdisc6 enp5s0 # Enable debug of NetworkManager. vim /etc/systemd/journald.conf /etc/NetworkManager/conf.d/95-nm-debug.conf ; systemctl restart systemd-journald ; systemctl restart NetworkManager # dhcp ipv6 nmcli -f DHCP6 device show enp5s0 DHCP6.OPTION[1]: dhcp6_client_id = 00:03:00:01:68:05:ca:01:f7:ac DHCP6.OPTION[2]: dhcp6_name_servers = 2001:9b0::53:1 2001:9b0::53:2 DHCP6.OPTION[3]: iaid = 00:01:e2:40 DHCP6.OPTION[4]: ip6_address = 2001:9b1:402d:0:ffff:9207:aa1:5f1b # dhclient.conf # -6 ipv6, -d debug, -v verbose, -n dont configure interface, -w wait after finnish. dhclient -6 -d -v -n -w # Figure out default gateway. Let below command running. ping6 ff02::2%enp5s0 # Look how to configure default router. ip -6 n # Set default route according to output above. ip -6 route add default via fe80::8ee5:efff:fe5b:ef9 dev enp5s0 # Add manual default router. nmcli connection modify bahnhof ipv6.gateway fe80::8ee5:efff:fe5b:ef9 nmcli connection modify bahnhof ipv6.method dhcp nmcli connection modify bahnhof ipv6.addr-gen-mode eui64 nmcli connection modify bahnhof ipv6.dhcp-duid ll nmcli connection modify bahnhof ipv6.dhcp-iaid 123456 nmcli connection modify bahnhof ipv6.never-default true nmcli connection modify bahnhof ipv6.ignore-auto-routes true # Enable ra on all interfaces. sysctl -a | grep "accept_ra = 0" | sed 's/0$/1/g;s/ //g' | while read i ; do sysctl $i ; done # dhcpv6 dp nmcli connection modify bahnhof \ ipv6.method auto \ ipv6.dhcp-duid stable-uuid \ ipv6.ip6-privacy 0 \ ipv6.addr-gen-mode eui64 \ ipv6.ra-timeout 20 \ ipv6.dhcp-send-hostname yes \ ipv6.addr-gen-mode stable-privacy # Manage connection from cli. /etc/NetworkManager/system-connections/bahnhof.nmconnection # Test addresses. 2001:4860:4860::8888 2001:4860:4860::8844 8.8.8.8 8.8.4.4
ndptool
sudo ndptool monitor --ifname=enp5s0 NDP payload len 32, from addr: fe80::8ee5:efff:fe5b:ef9, iface: enp5s0 Type: NA NDP payload len 32, from addr: 2001:9b1:402d::1, iface: enp5s0 Type: NS NDP payload len 32, from addr: 2001:9b1:402d::1, iface: enp5s0 Type: NA NDP payload len 32, from addr: fe80::8ee5:efff:fe5b:ef9, iface: enp5s0 Type: NS NDP payload len 32, from addr: fe80::8ee5:efff:fe5b:ef9, iface: enp5s0 Type: NA