Linux

ifupdown 更改參數 dhclient

  • April 18, 2022

我有 Ubuntu 20.04,我將所有網路功能都交給了 ifupdown。

我的介面的 1 個通過 dhclient 獲取網路參數:

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

Dhclient 以這樣的參數開始:

#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

客戶端版本:

# dhclient --version
isc-dhclient-4.4.1

客戶端配置:

# 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;

厭倦了Google如何更改 dhclient 啟動的參數(我想在沒有 -1 和守護程序模式的情況下啟動它),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

我該怎麼做?

謝謝!

dhclient 執行參數在 ifupdown 中硬編碼,您無法從其他地方更改它。

但我找到了解決方案:

  1. 將介面設置為靜態以防止通過 ifup 命令啟動 dhclient
  2. 通過 pre-up hook 使用您想要的任何參數執行 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

引用自:https://unix.stackexchange.com/questions/699373