udhcpc
- 默认配置 /etc/udhcpc/udhcpc.conf
- RESOLV_CONF=no - 不修改 resolve.conf
- 默认脚本 /usr/share/udhcpc/default.script
- 获取到配置后，调用脚本进行配置
- udhcpc.conf 内变量影响配置逻辑
- signals
- SIGUSR1 - 刷新状态，会从新获取 IP
- SIGUSR2 - 释放当前租约，进入不活跃状态，发送 SIGUSR1 信号可激活
- 参考
# 手动申请地址
udhcpc -i eth1 -q
default.script
脚本变量
| env | desc |
|---|---|
$HOME | $HOME 变量或 "/" |
$PATH | $PATH 变量或 "/bin:/usr/bin:/sbin:/usr/sbin" |
$1 | action |
| interface | interface |
| ip | ip |
| siaddr | bootp next server option |
| sname | bootp server name option |
| boot_file | bootp boot file option |
| subnet | subnet mask |
| timezone | Offset in seconds from UTC |
| router | A list of routers |
| timesvr | A list of time servers |
| namesvr | A list of IEN 116 name servers |
| dns | A list of DNS server |
| logsvr | A list of MIT LCS UDP log servers |
| cookiesvr | A list of RFC 865 cookie servers |
| lprsvr | A list of LPR servers |
| hostname | The assigned hostname |
| bootsize | The length in 512 octect blocks of the bootfile |
| domain | The domain name of the network |
| swapsvr | The IP address of the client's swap server |
| rootpath | The path name of the client's root disk |
| ipttl | The TTL to use for this network |
| mtu | The MTU to use for this network |
| broadcast | The broadcast address for this network |
| ntpsrv | A list of NTP servers |
| wins | A list of WINS servers |
| lease | The lease time, in seconds |
| dhcptype | DHCP message type (safely ignored) |
| serverid | The IP of the server |
| message | Reason for a DHCPNAK |
| tftp | The TFTP server name |
| bootfile | The bootfile name |