Alors bien sur que j'ai commencé par un ping vers l'extérieur. Cela dit:
Avec noyau 4.17
[Tower F28]/root # uname -r
4.17.19-200.fc28.x86_64
[Tower F28]/root # ifconfig
enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.3 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::213:46ff:fe3c:9d7c prefixlen 64 scopeid 0x20<link>
ether 00:13:46:3c:9d:7c txqueuelen 1000 (Ethernet)
RX packets 218 bytes 202514 (197.7 KiB)
RX errors 0 dropped 3 overruns 0 frame 0
TX packets 209 bytes 17998 (17.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Boucle locale)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[Tower F28]/root # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:13:46:3c:9d:7c brd ff:ff:ff:ff:ff:ff
inet 192.168.0.3/24 brd 192.168.0.255 scope global noprefixroute enp4s0
valid_lft forever preferred_lft forever
inet6 fe80::213:46ff:fe3c:9d7c/64 scope link
valid_lft forever preferred_lft forever
[Tower F28]/root # nmcli general permissions
PERMISSION VALUE
org.freedesktop.NetworkManager.enable-disable-network oui
org.freedesktop.NetworkManager.enable-disable-wifi oui
org.freedesktop.NetworkManager.enable-disable-wwan oui
org.freedesktop.NetworkManager.enable-disable-wimax oui
org.freedesktop.NetworkManager.sleep-wake oui
org.freedesktop.NetworkManager.network-control oui
org.freedesktop.NetworkManager.wifi.share.protected oui
org.freedesktop.NetworkManager.wifi.share.open oui
org.freedesktop.NetworkManager.settings.modify.system oui
org.freedesktop.NetworkManager.settings.modify.own oui
org.freedesktop.NetworkManager.settings.modify.hostname oui
org.freedesktop.NetworkManager.settings.modify.global-dns oui
org.freedesktop.NetworkManager.reload oui
org.freedesktop.NetworkManager.checkpoint-rollback oui
org.freedesktop.NetworkManager.enable-disable-statistics oui
org.freedesktop.NetworkManager.enable-disable-connectivity-check oui
[Tower F28]/root # nmcli connection show eth0
connection.id: eth0
connection.uuid: d6cdcbbe-c2f2-32a7-ad7c-c56fd7a2ee7c
connection.stable-id: --
connection.type: 802-3-ethernet
connection.interface-name: enp4s0
connection.autoconnect: oui
connection.autoconnect-priority: -999
connection.autoconnect-retries: -1 (default)
connection.auth-retries: -1
connection.timestamp: 1537101248
connection.read-only: non
connection.permissions: --
connection.zone: --
connection.master: --
connection.slave-type: --
connection.autoconnect-slaves: -1 (default)
connection.secondaries: --
connection.gateway-ping-timeout: 0
connection.metered: inconnu
connection.lldp: default
802-3-ethernet.port: --
802-3-ethernet.speed: 0
802-3-ethernet.duplex: --
802-3-ethernet.auto-negotiate: non
802-3-ethernet.mac-address: --
802-3-ethernet.cloned-mac-address: --
802-3-ethernet.generate-mac-address-mask:--
802-3-ethernet.mac-address-blacklist: --
802-3-ethernet.mtu: auto
802-3-ethernet.s390-subchannels: --
802-3-ethernet.s390-nettype: --
802-3-ethernet.s390-options: --
802-3-ethernet.wake-on-lan: ignore
802-3-ethernet.wake-on-lan-password: --
ipv4.method: manual
ipv4.dns: 8.8.8.8,192.168.0.1
ipv4.dns-search: --
ipv4.dns-options: ""
ipv4.dns-priority: 0
ipv4.addresses: 192.168.0.3/24
ipv4.gateway: 192.168.0.1
ipv4.routes: --
ipv4.route-metric: -1
ipv4.route-table: 0 (unspec)
ipv4.ignore-auto-routes: non
ipv4.ignore-auto-dns: non
ipv4.dhcp-client-id: --
ipv4.dhcp-timeout: 0 (default)
ipv4.dhcp-send-hostname: oui
ipv4.dhcp-hostname: --
ipv4.dhcp-fqdn: --
ipv4.never-default: non
ipv4.may-fail: non
ipv4.dad-timeout: -1 (default)
ipv6.method: ignore
ipv6.dns: --
ipv6.dns-search: --
ipv6.dns-options: ""
ipv6.dns-priority: 0
ipv6.addresses: --
ipv6.gateway: --
ipv6.routes: --
ipv6.route-metric: -1
ipv6.route-table: 0 (unspec)
ipv6.ignore-auto-routes: non
ipv6.ignore-auto-dns: non
ipv6.never-default: non
ipv6.may-fail: oui
ipv6.ip6-privacy: -1 (inconnu)
ipv6.addr-gen-mode: stable-privacy
ipv6.dhcp-send-hostname: oui
ipv6.dhcp-hostname: --
ipv6.token: --
proxy.method: none
proxy.browser-only: non
proxy.pac-url: --
proxy.pac-script: --
GENERAL.NAME: eth0
GENERAL.UUID: d6cdcbbe-c2f2-32a7-ad7c-c56fd7a2ee7c
GENERAL.DEVICES: enp4s0
GENERAL.STATE: activé
GENERAL.DEFAULT: oui
GENERAL.DEFAULT6: non
GENERAL.SPEC-OBJECT: --
GENERAL.VPN: non
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/ActiveConnection/1
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/Settings/1
GENERAL.ZONE: --
GENERAL.MASTER-PATH: --
IP4.ADDRESS[1]: 192.168.0.3/24
IP4.GATEWAY: 192.168.0.1
IP4.ROUTE[1]: dst = 192.168.0.0/24, nh = 0.0.0.0, mt = 100
IP4.ROUTE[2]: dst = 0.0.0.0/0, nh = 192.168.0.1, mt = 100
IP4.DNS[1]: 8.8.8.8
IP4.DNS[2]: 192.168.0.1
IP6.ADDRESS[1]: fe80::213:46ff:fe3c:9d7c/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]: dst = fe80::/64, nh = ::, mt = 256
et sur noyau 4.18:
[Tower F28]/root # uname -r
4.18.7-200.fc28.x86_64
[Tower F28]/root # ifconfig
enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.3 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::213:46ff:fe3c:9d7c prefixlen 64 scopeid 0x20<link>
ether 00:13:46:3c:9d:7c txqueuelen 1000 (Ethernet)
RX packets 186 bytes 22930 (22.3 KiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 187 bytes 15910 (15.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Boucle locale)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[Tower F28]/root # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:13:46:3c:9d:7c brd ff:ff:ff:ff:ff:ff
inet 192.168.0.3/24 brd 192.168.0.255 scope global noprefixroute enp4s0
valid_lft forever preferred_lft forever
inet6 fe80::213:46ff:fe3c:9d7c/64 scope link
valid_lft forever preferred_lft forever
Tower F28]/root # ping localhost
PING localhost(localhost (::1)) 56 data bytes
64 bytes from localhost (::1): icmp_seq=1 ttl=64 time=0.041 ms
64 bytes from localhost (::1): icmp_seq=2 ttl=64 time=0.027 ms
64 bytes from localhost (::1): icmp_seq=3 ttl=64 time=0.026 ms
^C
--- localhost ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2081ms
rtt min/avg/max/mdev = 0.026/0.031/0.041/0.008 ms
[Tower F28]/root # ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
^C
--- 192.168.0.1 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4103ms
lid_lft forever preferred_lft forever