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dhclient：未找到广播接口，但 eth0 已启动并广播

tag-icon • tag-icon debian dhcp dhclient eth0
dhclient：未找到广播接口，但 eth0 已启动并广播

我遇到了 dhclient 的一个常见问题。但我无法找到该问题的明确解决方案。

系统：

  • ReadyNas RN104
  • armhf 的原装 Debian
  • 刚刚升级到 Debian Jessie
  • 自建整体式（即无模块）内核 4.0.5

如果我手动调用，sudo dhclient eth0一切都正常。

我如何告诉 dhclient 自动使用 eth0？

$ ifconfig eth0
eth0  Link encap:Ethernet  HWaddr 72:84:91:48:ff:51  
      inet6 addr: fe80::7084:91ff:fe48:ff51/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:63 errors:0 dropped:0 overruns:0 frame:0
      TX packets:75 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:532 
      RX bytes:6743 (6.5 KiB)  TX bytes:26010 (25.4 KiB)
      Interrupt:26 

$ sudo dhclient -v
Internet Systems Consortium DHCP Client 4.3.1
...
No broadcast interfaces found - exiting.

$ cat /etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

# max address from uboot printenv ethaddr, eth1addr
pre-up ip link set dev eth0 address 28:XX:XX:XX:XX:X4
pre-up ip link set dev eth1 address 28:XX:XX:XX:XX:X5

$ dmesg |grep eth
mvneta d0070000.ethernet eth0: Using random mac address 72:84:91:48:XX:XX
mvneta d0074000.ethernet eth1: Using random mac address f2:0c:25:7d:XX:XX
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
mvneta d0070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
mvneta d0070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

$cat ./devices/platform/soc/soc:internal-regs/d0070000.ethernet/net/eth0/flags
0x1003

答案1

我遇到了同样的问题，我最近将 Raspberry PI 1 Model B 从 Raspian Wheezy 升级到了 Jessie。启动后，接口 eth0 已启动，但没有分配 DHCP 地址。运行dhclient不带参数会导致No broadcast interfaces found - exiting运行dhclient eth0正常。

对我来说，解决方案是添加auto eth0到/etc/网络/接口（但不确定为什么）：

auto lo
auto eth0

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

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