IPv6

Volem veure les estadístiques de paquets amb iproute2. De sempre s’ha utilitzat ifconfig però amb iproute2 es pot fer de la forma següent:

ip -s link show he-ipv6

6: he-ipv6@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1480 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/sit 192.168.1.1 peer 192.168.1.2
    RX: bytes  packets  errors  dropped overrun mcast
    330353900  465900   0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    73840575   582079   0       0       0       0

Preferència IPv4 sobre IPv6

Editar el fitxer /etc/gai.conf i descomentar aquest línia

precedence ::ffff:0:0/96  100

TCPDUMP

tcpdump -v ip6

DNSMASQ DHCP Server

enable-ra
dhcp-range=eth0,2000:570:c901:1::8c,2000:570:c901:1::ff,ra-only,64,1h
dhcp-option=option6:dns-server,[2000:570:c901:1::1]

dhcp-host=05:1e:c2:01:18:75,192.168.0.3,2000:570:c901:1::3,host3
dhcp-host=05:aa:14:90:00:40,192.168.0.4,2000:570:c901:1::4,host4
dhcp-host=05:60:6e:da:9d:68,192.168.0.5,2000:570:c901:1::5,host5

DNSMASQ DHCP LEASES

cat /var/lib/misc/dnsmasq.leases
1568978878 1859820904 2000:570:c901:1::4 host4 00:04:fe:d1:e7:8c:1c:ce:82:f1:27:8d:96:65:1a:91:4d:f4

Exemples de configuració de xarxa

LinuxMint

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
auto enp3s0

#iface enp3s0 inet dhcp
#   hwaddress ether 08:60:6e:da:9d:68

#iface enp3s0 inet6 dhcp
#    hwaddress ether 08:60:6e:da:9d:68


iface enp3s0 inet static
    hwaddress ether 08:60:6e:da:9d:68
    address 192.168.0.10
    netmask 255.255.255.0
    gateway 192.168.0.1
    dns-nameserver 192.168.0.1
    dns-search local.net

iface enp3s0 inet6 static
    hwaddress ether 08:60:6e:da:9d:68
    address 2001:470:69e2:1::100
    netmask 64
    dns-nameserver 2001:470:69e2:1::1
    dns-search local.net
    gateway 2001:470:69e2:1::1

Raspbian GNU/Linux 9 (stretch)

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto eth0
  iface eth0 inet static
  address 192.168.0.48
  netmask 255.255.255.0
  gateway 192.168.0.1

  iface eth0 inet6 static
  address 2001:470:69e2:0001::48
  netmask 64
  gateway 2001:470:69e2:1::1

Raspbian GNU/Linux 10 (buster)

cat /etc/dhcpcd.conf

interface eth0
static ip_address=192.168.0.10/24
static ip6_address=2001:470:69e2:0001::48/64
static routers=192.168.0.1
static domain_name_servers=192.168.0.1 8.8.8.8 fd51:42f8:caae:d92e::1

Ubuntu 22.04 (Jammy Jellyfish)

cat /etc/netplan/00-network.yml

network:
  ethernets:
    enp0s3:
      #dhcp4: true
      accept-ra: no
      addresses:
        - "2001:470:69e2:1::188/64"
      routes:
        - to: default
          via: "2001:470:69e2:1::1"
      nameservers:
        addresses: [8.8.8.8, "2001:470:69e2:1::1"]

mkdir -p /etc/systemd/resolved.conf.d;  echo -e "[Resolve]\nDNSStubListenerExtra=[::1]:53" >/etc/systemd/resolved.conf.d/localipv6.conf