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Dave
Asked: 2025-01-10 21:25:06 +0800 CST

为什么 ifupdown 找不到 dhcpcd？

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所以我有一个用 yocto 构建的嵌入式系统。我正在尝试启用 DHCPv6。但是当我尝试将接口联机时，ifup 说它找不到 DHCPv6 软件，即使安装了 dhcpcd。如果我手动运行 dhcpcd，它就可以工作。

root@1234:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address 192.168.5.80
        netmask 255.255.255.0
        gateway 192.168.5.1

iface eth1 inet6 dhcp

root@1234:~# ip a show dev eth1
8: eth1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue qlen 1000
    link/ether ce:e6:83:59:f1:93 brd ff:ff:ff:ff:ff:ff
    inet 169.254.23.45/16 brd 169.254.255.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::468b:6249:e50b:a437/64 scope link
       valid_lft forever preferred_lft forever

root@1234:~# which dhcpcd
/sbin/dhcpcd

root@1234:~# ifup eth1
No DHCPv6 client software found!
ifup: failed to bring up eth1

root@1234:~#

请注意，eth1 现在只是一个虚拟接口，因此我不会因为 eth0 而破坏我的 ssh 连接，而 eth0 才是我真正想要添加 DHCPv6 的地方。

networking

1 个回答

  1. Best Answer
    $ apt-get source ifupdown
[...]
$ grep -rB2 'No DHCPv6 client software found' ifupdown-0.8.44
ifupdown-0.8.44/inet6.defn-    dhclient -6 -1 -v -S -pf /run/dhclient6.%iface%.pid -lf /var/lib/dhcp/dhclient6.%iface%.leases -I -df /var/lib/dhcp/dhclient.%iface%.leases %iface% \
ifupdown-0.8.44/inet6.defn-        elsif (var_true("dhcp", ifd) && execable("dhclient"))
ifupdown-0.8.44/inet6.defn:    echo 'No DHCPv6 client software found!' >&2; false \
[...]

    它正在寻找dhclient，而不是dhcpcd。

    在inet.defn：

    method dhcp
  description
    This method may be used to obtain an address via DHCP with any of
    the tools: dhclient, udhcpc, dhcpcd.

    但对于来说inet6，dhclient仅此而已。

    它存在于：

    $ apt-file search -F /usr/sbin/dhclient
isc-dhcp-client: /usr/sbin/dhclient
isc-dhcp-client-ddns: /usr/sbin/dhclient
    • 1

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