ifupdown更改参数dhclient

Question

我有Ubuntu20.04，我把所有的网络功能都给了ifupdown。

1我的接口通过dhclient获取网络参数：

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

Dhclient从以下参数开始：

#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

Dhclient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google如何更改dhclient的参数(我希望在没有-1和守护进程模式下启动它)，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

我怎么能做到呢？

谢谢!

Answer 1

dhclient运行在ifupdown中硬编码的参数，您不能从其他地方更改它。

但我找到了一个解决办法：

1. 将接口设置为静态的，以防止通过ifup命令
2. 来启动dhclient，并通过预向上钩子

运行dhclient所需的任何参数。

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