Bonjour,
je me bats avec wireguard sous Debian 11: le trafic d'une des extremités est renvoyé par l'interface lo comme ci dessous (tcpdump -ni any icmp6)
19:23:50.287492 wig0 In IP6 fd99:1234:beef:cafe:fade::7000 > fd99:1234:beef:cafe:fade::7fff: ICMP6, echo request, id 18272, seq 5, length 64
19:23:50.287509 lo In IP6 fd99:1234:beef:cafe:fade::7fff > fd99:1234:beef:cafe:fade::7000: ICMP6, echo reply, id 18272, seq 5, length 6
J'ai testé avec 2 peers différents -également Debian11- le résultat est identique. La sortie ip est
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 90:1b:0e:93:4c:b1 brd ff:ff:ff:ff:ff:ff
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 500
link/none
5: tun1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 500
link/none
6: virbr0: <BROADCAST,MULTICAST,ALLMULTI,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:76:8e:2e brd ff:ff:ff:ff:ff:ff
7: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master virbr0 state UNKNOWN mode DEFAULT group default qlen 1000
link/ether fe:54:00:da:70:14 brd ff:ff:ff:ff:ff:ff
8: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master virbr0 state UNKNOWN mode DEFAULT group default qlen 1000
link/ether fe:54:00:da:70:12 brd ff:ff:ff:ff:ff:ff
9: vnet2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master virbr0 state UNKNOWN mode DEFAULT group default qlen 1000
link/ether fe:54:00:da:70:11 brd ff:ff:ff:ff:ff:ff
10: vnet3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master virbr0 state UNKNOWN mode DEFAULT group default qlen 1000
link/ether fe:54:00:da:70:13 brd ff:ff:ff:ff:ff:ff
11: vnet4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master virbr0 state UNKNOWN mode DEFAULT group default qlen 1000
link/ether fe:54:00:da:70:15 brd ff:ff:ff:ff:ff:ff
20: wig0: <POINTOPOINT,NOARP,ALLMULTI,UP,LOWER_UP> mtu 1436 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/none
et ip -6 r
::1 dev lo proto kernel metric 256 pref medium
2001:db8:120:1104::/96 dev virbr0 proto kernel metric 256 pref medium
2001:db8:120:1104::/64 dev eth0 proto kernel metric 256 pref medium
fd99:1234:beef:cafe:fade::7010/124 dev virbr0 proto kernel metric 128 pref medium
fd99:1234:beef:cafe:fade::7000/116 dev wig0 proto kernel metric 256 pref medium
fd99:1234:beef:cafe::/64 via fd99:1234:beef:cafe:fade::7000 dev wig0 metric 1024 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev tun0 proto kernel metric 256 pref medium
fe80::/64 dev tun1 proto kernel metric 256 pref medium
fe80::/64 dev vnet0 proto kernel metric 256 pref medium
fe80::/64 dev vnet1 proto kernel metric 256 pref medium
fe80::/64 dev vnet2 proto kernel metric 256 pref medium
fe80::/64 dev virbr0 proto kernel metric 256 pref medium
fe80::/64 dev vnet3 proto kernel metric 256 pref medium
fe80::/64 dev vnet4 proto kernel metric 256 pref medium
default via fe80::1 dev eth0 metric 1024 onlink pref medium
Ce serveur fait tourner libvirt pour des MV, aucun problème d'accès entre elles (fd99:1234:beef:cafe:fade::7010/124 dev virbr0) ni avec le serveur fd99:1234:beef:cafe:fade::7000/116 Les interfaces tunX sont des liens OpenVPN ipv4 fonctionnels.
Si quelqu'un avait une idée de la source du problème je serai ravi de la connaître
Daniel