dhclient 增加 option 60 和 61

朴灿烈づ我的快乐病毒、 2022-04-22 11:58 316阅读 0赞

# 1 概述 #

IPOE属于DHCP的认证类型，机顶盒开机将接入用户名及密码加密后封装进 DHCP Discover 包中的Option 60 字段里，发送DHCP请求，DHCP服务器认证成功即可获取IP地址。dhclient工具可以通过命令行直接加参数的形式或者配置文件的形式增加option

# 2 环境 #

虚拟机下面的centos 6.5

获取IP地址方式

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NTc2ODM_size_16_color_FFFFFF_t_70][]

# 3 命令行加参数操作 #

## 3.1 释放ip ##

(1) 默认所有网口

sudo dhclient -r

或者指定网口:

sudo dhclient eth0 -r

## 3.2 获取ip ##

Usage: dhclient [-4|-6] [-SNTP1dvrx] [-nw] [-p <port>] [-s server]
    
    [-cf config-file] [-lf lease-file][-pf pid-file] [-e VAR=val]
    
    [-I <dhcp-client-identifier>] [-B]
    
    [-H <host-name> | -F <fqdn.fqdn>] [-timeout <timeout>]
    
    [-V <vendor-class-identifier>]
    
    [-R <request option list>]
    
    [-sf script-file] [interface]

(1) 所有网口

发送字符串：

sudo dhclient -V "name=my centos@pwd=12345678"

(2) 或者指定网口:

sudo dhclient eth0 -V "name=my centos@pwd=12345678"

# 4 通过配置文件修改 #

备注：

默认配置文件路径 /etc/dhcp/dhclient.conf

## 4.1 找配置文件 ##

(1) 当发现不存在 /etc/dhcp/dhclient.conf 文件时，可以查找根目录是否存在文件

find -name "dhc*"

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NTc2ODM_size_16_color_FFFFFF_t_70 1][]

(2) 拷贝配置文件到默认目录

cp /usr/share/doc/dhclient-4.1.1/dhclient.conf.sample /etc/dhcp/dhclient.conf

## 4.2 修改配置文件 ##

vi /etc/dhcp/dhclient.conf

(1) 增加 option 60 :

(a) 普通字符串

send vendor-class-identifier "name=my centos@pwd=0123456789";

(b) 16进制值

send vendor-class-identifier 01:02:03:04:05:0A:0B;

(2) 增加 option 61

send dhcp-client-identifier = hardware;

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NTc2ODM_size_16_color_FFFFFF_t_70 2][]

## 4.3 释放ip ##

(1) 释放所有网口

sudo dhclient -r

(2) 释放指定网口

sudo eth0 dhclient -r

## 4.4 获取ip ##

(1) 所有网口获取

sudo dhclient

(2) 指定网口获取

sudo eth0 dhclient

# 5 抓包分析 #

(1) win7桌面打开wireshark

选择过滤条件：bootp.type

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NTc2ODM_size_16_color_FFFFFF_t_70 3][]

(2) centos 执行命令

释放ip命令

sudo dhclient eth0 -r

获取ip命令

sudo dhclient eth0

(3) 查看wireshark

分析request包

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NTc2ODM_size_16_color_FFFFFF_t_70 4][]

# 6 附录 #

完整配置文件

send host-name "andare.fugue.com";
    
    send dhcp-client-identifier 1:0:a0:24:ab:fb:9c;
    
    send dhcp-lease-time 3600;
    
    supersede domain-search "fugue.com", "home.vix.com";
    
    prepend domain-name-servers 127.0.0.1;
    
    request subnet-mask, broadcast-address, time-offset, routers,
    
    domain-search, domain-name, domain-name-servers, host-name;
    
    require subnet-mask, domain-name-servers;
    
    timeout 60;
    
    
    
    send vendor-class-identifier "name=my centos@pwd=0123456789";
    
    
    
    send dhcp-client-identifier = hardware;
    
    
    
    #retry 60;
    
    #reboot 10;
    
    #select-timeout 5;
    
    #initial-interval 2;
    
    #script "/etc/dhclient-script";
    
    #media "-link0 -link1 -link2", "link0 link1";
    
    #reject 192.33.137.209;
    
    
    
    #alias {
    
    # interface "ep0";
    
    # fixed-address 192.5.5.213;
    
    # option subnet-mask 255.255.255.255;
    
    #}
    
    
    
    #lease {
    
    # interface "ep0";
    
    # fixed-address 192.33.137.200;
    
    # medium "link0 link1";
    
    # option host-name "andare.swiftmedia.com";
    
    # option subnet-mask 255.255.255.0;
    
    # option broadcast-address 192.33.137.255;
    
    # option routers 192.33.137.250;
    
    # option domain-name-servers 127.0.0.1;
    
    # renew 2 2000/1/12 00:00:01;
    
    # rebind 2 2000/1/12 00:00:01;
    
    # expire 2 2000/1/12 00:00:01;
    
    #}

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