etc/network/interfaces.m4

   1 auto lo
   2 iface lo inet loopback
   3
   4 auto eth0=grenode
   5 iface grenode inet static
   6         address   LOCAL_IPV4
   7         gateway   LOCAL_GATEWAY
   8         network   LOCAL_IPV4
   9         broadcast LOCAL_IPV4
  10         netmask   LOCAL_NETMASK
  11         mtu 1300
  12           # NOTE: il y a besoin de ça en l'état actuel du réseau de Grenode
  13           #       car la MTU des tunnels GRE/IPsec entre les routeurs de Grenode l'impose.
  14           #
  15           # root@ateliers:~# ping -M do -c 1 -s $((1500-20-8-200)) soupirail.grenode.net
  16           # PING soupirail.grenode.net (91.216.110.1) 1272(1300) bytes of data.
  17           # 1280 bytes from soupirail.grenode.net (91.216.110.1): icmp_req=1 ttl=63 time=18.0 ms
  18           #
  19           # --- soupirail.grenode.net ping statistics ---
  20           # 1 packets transmitted, 1 received, 0% packet loss, time 0ms
  21           # rtt min/avg/max/mdev = 18.027/18.027/18.027/0.000 ms
  22           # root@ateliers:~# ping -M do -c 1 -s $((1500-20-8-200+1)) soupirail.grenode.net
  23           # PING soupirail.grenode.net (91.216.110.1) 1273(1301) bytes of data.
  24           # From estran.grenode.net (91.216.110.6) icmp_seq=1 Frag needed and DF set (mtu = 1300)
  25           #
  26           # --- soupirail.grenode.net ping statistics ---
  27           # 0 packets transmitted, 0 received, +1 errors
  28         post-up   ip address add LOCAL_GATEWAY dev $IFACE
  29         post-down ip address del LOCAL_GATEWAY dev $IFACE