無線LAN環境PC（Windows10）のVirtualBox(CentOS：NAT、ホストオンリーアダプター)で
pingが通らない(-“-)
yum updateもできないって事だよね（汗
CentOS Linux release 7.8.2003 (Core)
VirtualBox6.1
設定変更前
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:c4:22:98 brd ff:ff:ff:ff:ff:ff
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:06:71:5d brd ff:ff:ff:ff:ff:ff
inet 192.168.56.101/24 brd 192.168.56.255 scope global dynamic enp0s8
valid_lft 405sec preferred_lft 405sec
inet6 fe80::a00:27ff:fe06:715d/64 scope link
valid_lft forever preferred_lft forever
設定変更後
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:c4:22:98 brd ff:ff:ff:ff:ff:ff
inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3
valid_lft 85193sec preferred_lft 85193sec
inet6 fe80::a00:27ff:fec4:2298/64 scope link
valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:06:71:5d brd ff:ff:ff:ff:ff:ff
inet 192.168.56.101/24 brd 192.168.56.255 scope global enp0s8
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe06:715d/64 scope link
valid_lft forever preferred_lft forever
そもそも、network-scripts内にホストオンリーアダプター（enp0s8）の設定ファイルが無い！
# ls ifcfg-enp0s3 ifdown-isdn ifup-bnep ifup-routes ifcfg-lo ifdown-post ifup-eth ifup-sit ifdown ifdown-ppp ifup-ib ifup-tunnel ifdown-Team ifdown-routes ifup-ippp ifup-wireless ifdown-TeamPort ifdown-sit ifup-ipv6 init.ipv6-global ifdown-bnep ifdown-tunnel ifup-isdn network-functions ifdown-eth ifup ifup-plip network-functions-ipv6 ifdown-ib ifup-Team ifup-plusb ifdown-ippp ifup-TeamPort ifup-post ifdown-ipv6 ifup-aliases ifup-ppp
nmcli（NetworkManager）で設定してみる！
# nmcli connection add type ethernet con-name enp0s8 ifname enp0s8 接続 'enp0s8' (077818b0-b9ec-4539-820b-1310d39feed0) が正常に追加されました。
↓
# ls ifcfg-enp0s3 ifdown-ipv6 ifup-aliases ifup-ppp ifcfg-enp0s8 ifdown-isdn ifup-bnep ifup-routes ifcfg-lo ifdown-post ifup-eth ifup-sit ifdown ifdown-ppp ifup-ib ifup-tunnel ifdown-Team ifdown-routes ifup-ippp ifup-wireless ifdown-TeamPort ifdown-sit ifup-ipv6 init.ipv6-global ifdown-bnep ifdown-tunnel ifup-isdn network-functions ifdown-eth ifup ifup-plip network-functions-ipv6 ifdown-ib ifup-Team ifup-plusb ifdown-ippp ifup-TeamPort ifup-post
# cat ifcfg-enp0s3 TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=enp0s3 UUID=cd64098d-6347-4e4b-bf61-21058ac91b40 DEVICE=enp0s3 ONBOOT=no
# cat ifcfg-enp0s8 TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=enp0s8 UUID=077818b0-b9ec-4539-820b-1310d39feed0 DEVICE=enp0s8 ONBOOT=yes
# nmcli connection show 名前 UUID タイプ デバイス enp0s8 077818b0-b9ec-4539-820b-1310d39feed0 802-3-ethernet -- 有線接続 1 f9c45c48-0a4f-4dca-8c50-70d1db95310b 802-3-ethernet enp0s8 enp0s3 cd64098d-6347-4e4b-bf61-21058ac91b40 802-3-ethernet --
enp0s8が重複しているので「有線接続 1」消しちゃう！
# nmcli connection delete f9c45c48-0a4f-4dca-8c50-70d1db95310b
固定IPを指定しちゃう。
# nmcli connection modify enp0s8 ipv4.method manual ipv4.addresses 192.168.56.101/24
ネットワークサービス再起動！！
systemctl restart network.service
設定後
# cat ifcfg-enp0s3 TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=enp0s3 UUID=cd64098d-6347-4e4b-bf61-21058ac91b40 DEVICE=enp0s3 ONBOOT=no
# cat ifcfg-enp0s8 TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no NAME=enp0s8 UUID=077818b0-b9ec-4539-820b-1310d39feed0 DEVICE=enp0s8 ONBOOT=yes IPADDR=192.168.56.101 PREFIX=24 IPV6_PEERDNS=yes IPV6_PEERROUTES=yes
# nmcli -p connection show enp0s8
===============================================================================
Connection profile details (enp0s8)
===============================================================================
connection.id: enp0s8
connection.uuid: 077818b0-b9ec-4539-820b-1310d39feed0
connection.interface-name: enp0s8
connection.type: 802-3-ethernet
connection.autoconnect: yes
connection.autoconnect-priority: 0
connection.timestamp: 1594261577
connection.read-only: no
connection.permissions:
connection.zone: --
connection.master: --
connection.slave-type: --
connection.secondaries:
connection.gateway-ping-timeout: 0
-------------------------------------------------------------------------------
802-3-ethernet.port: --
802-3-ethernet.speed: 0
802-3-ethernet.duplex: --
802-3-ethernet.auto-negotiate: yes
802-3-ethernet.mac-address: --
802-3-ethernet.cloned-mac-address: --
802-3-ethernet.mac-address-blacklist:
802-3-ethernet.mtu: 自動
802-3-ethernet.s390-subchannels:
802-3-ethernet.s390-nettype: --
802-3-ethernet.s390-options:
-------------------------------------------------------------------------------
ipv4.method: manual
ipv4.dns:
ipv4.dns-search:
ipv4.addresses: 192.168.56.101/24
ipv4.gateway: --
ipv4.routes:
ipv4.route-metric: -1
ipv4.ignore-auto-routes: no
ipv4.ignore-auto-dns: no
ipv4.dhcp-client-id: --
ipv4.dhcp-send-hostname: yes
ipv4.dhcp-hostname: --
ipv4.never-default: no
ipv4.may-fail: yes
-------------------------------------------------------------------------------
ipv6.method: auto
ipv6.dns:
ipv6.dns-search:
ipv6.addresses:
ipv6.gateway: --
ipv6.routes:
ipv6.route-metric: -1
ipv6.ignore-auto-routes: no
ipv6.ignore-auto-dns: no
ipv6.never-default: no
ipv6.may-fail: yes
ipv6.ip6-privacy: -1 (不明)
ipv6.dhcp-send-hostname: yes
ipv6.dhcp-hostname: --
-------------------------------------------------------------------------------
===============================================================================
Activate connection details (077818b0-b9ec-4539-820b-1310d39feed0)
===============================================================================
GENERAL.名前: enp0s8
GENERAL.UUID: 077818b0-b9ec-4539-820b-1310d39feed0
GENERAL.デバイス: enp0s8
GENERAL.状態: アクティベート済み
GENERAL.デフォルト: いいえ
GENERAL.デフォルト6: いいえ
GENERAL.VPN: いいえ
GENERAL.ゾーン: --
GENERAL.DBUS パス: /org/freedesktop/NetworkManager/ActiveConnection/2
GENERAL.CON パス: /org/freedesktop/NetworkManager/Settings/2
GENERAL.スペックオブジェクト: /
GENERAL.マスターパス: --
-------------------------------------------------------------------------------
IP4.アドレス[1]: 192.168.56.101/24
IP4.ゲートウェイ:
-------------------------------------------------------------------------------
IP6.アドレス[1]: fe80::a00:27ff:fe06:715d/64
IP6.ゲートウェイ:
-------------------------------------------------------------------------------
疎通成功！！
# ping www.yahoo.co.jp PING edge12.g.yimg.jp (182.22.25.124) 56(84) bytes of data. 64 bytes from 182.22.25.124: icmp_seq=1 ttl=56 time=21.8 ms 64 bytes from 182.22.25.124: icmp_seq=2 ttl=56 time=22.2 ms 64 bytes from 182.22.25.124: icmp_seq=3 ttl=56 time=23.3 ms
