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/etc/hosts

tag-icon • tag-icon virtual-machines dhcp ipv6 ubuntu-16.04 ipv4
/etc/hosts

我有一个 Ubuntu Server 16.04 LTs，它是 ESX（VMware）上的虚拟机。该服务器采用 dhcp 配置，直到今天都运行良好。（我知道服务器应该使用静态地址，但就我而言，我实际上不需要静态地址）。今天，我重新启动了服务器（虚拟机），服务器不再有 IPv4，只有 IPv6。

我没有在配置中改变任何东西，我将向您展示我认为有用的不同文件/配置，如果您需要更多，只需询问。

/etc/hosts

127.0.0.1       localhost
127.0.1.1       my_hostname

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

/etc/主机名

my_hostname

/etc/网络/接口

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

ifconfig命令输出

eth0      Link encap:Ethernet  HWaddr 00:50:56:94:d1:ae
          adr inet6: fe80::250:56ff:fe94:d1ae/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:68852 erreurs:0 :0 overruns:0 frame:0
          TX packets:1120 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:5658008 (5.6 MB) Octets transmis:329017 (329.0 KB)

lo        Link encap:Boucle locale
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          Packets reçus:26990 erreurs:0 :0 overruns:0 frame:0
          TX packets:26990 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1
          Octets reçus:1997350 (1.9 MB) Octets transmis:1997350 (1.9 MB)

我尝试释放 IPv4dhclient -4 -r -v

Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:50:56:94:d1:ae
Sending on   LPF/eth0/00:50:56:94:d1:ae
Sending on   Socket/fallback

IPv6 也一样dhclient -6 -r -v

Removed stale PID file
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on Socket/eth0
Sending on   Socket/eth0

**And it block here**

我也尝试询问下一个 IPdhclient -4 -v

DHCPDISCOVER on eth0 to 255.255.255.255 port 67
...
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

我知道 DHCP 服务器的 IP 地址，所以我指定了它，dhclient -4 -v -s IP_ADDRESS_DHCP_SERVER

DHCPDISCOVER on eth0 to IP_ADDRESS_DHCP_SERVER port 67
...
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

我不知道该怎么办了，我尝试禁用 IPv6，但之后我却无法获取任何 IP。我不明白，昨天它运行正常……

如果你有想法，我会采纳！
谢谢

答案1

找到问题了，我有一个 IPv6 地址（我甚至成功使用 IPv6 在 ssh 中连接到我的 VM），问题只是没有足够的 IPv4 可用。网络管理员删除了一些旧的保留，它就起作用了！我让这个帖子告诉那些像我一样愚蠢的人，他们没有发现问题：）

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