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ifupdown 改变dhclient参数

tag-icon • tag-icon linux networking dhcp isc-dhcpd ifupdown
ifupdown 改变dhclient参数

我有 Ubuntu 20.04，我将所有网络功能都交给了 ifupdown。

我的接口1通过dhclient获取网络参数：

#/etc/network/interfaces
allow-hotplug enp2s0
auto enp2s0
iface enp2s0 inet dhcp

Dhclient 以这样的参数启动：

#ps -Af | grep dhclient

/sbin/dhclient -1 -4 -v -i -pf /run/dhclient.enp2s0.pid -lf /var/lib/dhcp/dhclient.enp2s0.leases -I -df /var/lib/dhcp/dhclient6.enp2s0.leases enp2s0

DH客户端版本：

# dhclient --version
isc-dhclient-4.4.1

客户端配置：

# cat /etc/dhcp/dhclient.conf 
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;

send host-name = gethostname();
request subnet-mask, broadcast-address, time-offset, routers,
    domain-name, domain-name-servers, domain-search, host-name,
    dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
    netbios-name-servers, netbios-scope, interface-mtu,
    rfc3442-classless-static-routes, ntp-servers;

timeout 60;
retry 60;
reboot 10;
reject 10.100.0.2;

厌倦了谷歌如何更改 dhclient 启动的参数（我想在没有 -1 的情况下以守护进程模式启动它），如下所示：

/sbin/dhclient -nw -4 -v -pf /run/dhclient.enp2s0.pid -lf /var/lib/dhcp/dhclient.enp2s0.leases -I -df /var/lib/dhcp/dhclient6.enp2s0.leases enp2s0

我怎样才能做到呢？

谢谢你！

答案1

dhclient 运行参数硬编码在 ifupdown 内，您无法从其他地方更改它。

但我找到了解决方案：

  1. 将接口设置为静态以防止通过 ifup 命令启动 dhclient
  2. 通过 pre-up hook 使用您想要的任何参数运行 dhclient
allow-hotplug enp2s0
auto enp2s0
iface enp2s0 inet static
    address 192.168.1.1
    netmask 255.255.255.255

    pre-up /sbin/dhclient -4 -v -pf /run/dhclient.enp2s0.pid -lf /var/lib/dhcp/dhclient.enp2s0.leases -I -df /var/lib/dhcp/dhclient6.enp2s0.leases enp2s0 
    pre-down /sbin/dhclient -4 -v -r -pf /run/dhclient.enp2s0.pid -lf /var/lib/dhcp/dhclient.enp2s0.leases -I -df /var/lib/dhcp/dhclient6.enp2s0.leases enp2s0

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