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dhcrelay
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===
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使用dhcrelay命令可以提供中继DHCP和BOOTP请求
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## 说明
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**dhcrelay命令** 使用dhcrelay命令可以提供中继DHCP和BOOTP请求，从一个没有DHCP服务器的子网直接连接到其它子网内的一个或多个DHCP服务器。该命令在DHCP中继服务器上使用，同时支持DHCPv4/BOOTP和DHCPv6协议
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## 选项
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```
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dhcrelay [选项] [DHCP服务器]
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```
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```
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-c <跳数> 当转发数据包时，dhcrelay丢弃已经达到一个最大跳数的数据包。默认值是10，最大值是255
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-4 运行dhcrelay命令作为DHCPv4/BOOTP中继代理。这是默认操作模式
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-6 运行dhcrelay命令作为DHCPv6中继代理
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-q 安静模式
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-p <端口> 监听和发送端口。DHCPv4/BOOTP默认端口是67，DHCPv6默认端口是547
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-A <长度> 指定发送到DHCP服务器的最大数据包大小
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-d 强制dhcrelay命令作为前台进程运行
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```
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## 实例
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指定DHCP服务器的位置
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```bash
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[root@localhost ~]# dhcrelay 192.168.0.2
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Internet Systems Consortium DHCP Relay Agent4.1.1-P1
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Copyright 2004-2010 Internet SystemsConsortium.
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All rights reserved.
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For info, please visithttps://www.isc.org/software/dhcp/
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Listening on LPF/eth1/00:0c:29:fc:2f:ef
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Sending on LPF/eth1/00:0c:29:fc:2f:ef
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Listening on LPF/eth0/00:0c:27:fc:25:ec
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Sending on LPF/eth0/00:0c:27:fc:25:ec
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Sending on Socket/fallback
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```
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