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14.04 使用 2 个网卡共享互联网

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14.04 使用 2 个网卡共享互联网

我使用 Ubuntu 14.04 32 位

我有以下问题，我必须共享互联网： 1 个互联网服务器（eth1） 1 个使用其他网卡转发互联网（这是需要配置的机器 - eth2） Pcs 客户。

互联网通过一根网线连到服务器，另一张网卡连到为微客户端分配的交换机。

问题是：怎样获得一张可以上网的网卡并分配另一张呢？

先谢谢了。

请查看我的系统日志

    May  7 10:40:37 asterisk dhcpd: options subnet-mask 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 6: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options broadcast-address 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 7: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options routers 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 8: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options domain-name-servers 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 9: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options domain-name 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: Configuration file errors encountered -- exiting
    May  7 10:40:37 asterisk dhcpd: Internet Systems Consortium DHCP Server 4.2.2
    May  7 10:40:37 asterisk dhcpd: Copyright 2004-2011 Internet Systems Consortium.
    May  7 10:40:37 asterisk dhcpd: All rights reserved.
    May  7 10:40:37 asterisk dhcpd: For info, please visit         https://www.isc.org/software/dhcp/
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 5: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options subnet-mask 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 6: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options broadcast-address 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 7: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options routers 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 8: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options domain-name-servers 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: /etc/dhcp/dhcpd.conf line 9: semicolon expected.
    May  7 10:40:37 asterisk dhcpd: options domain-name 
    May  7 10:40:37 asterisk dhcpd:          ^
    May  7 10:40:37 asterisk dhcpd: Configuration file errors encountered -- exiting
    May  7 10:40:49 asterisk dhcpd: Wrote 0 leases to leases file.
    May  7 10:40:49 asterisk dhcpd: 
    May  7 10:40:49 asterisk dhcpd: No subnet declaration for eth2 (no IPv4 addresses).
    May  7 10:40:49 asterisk dhcpd: ** Ignoring requests on eth2.  If this is not what
    May  7 10:40:49 asterisk dhcpd:    you want, please write a subnet declaration
    May  7 10:40:49 asterisk dhcpd:    in your dhcpd.conf file for the network segment
    May  7 10:40:49 asterisk dhcpd:    to which interface eth2 is attached. **
    May  7 10:40:49 asterisk dhcpd: 
    May  7 10:40:49 asterisk dhcpd: 
    May  7 10:40:49 asterisk dhcpd: Not configured to listen on any interfaces!

答案1

首先要启用 IP 转发。可以使用

echo "1" > /proc/sys/net/ipv4/ip_forward

然后，我们将添加一条规则，告诉转发流量

iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT

最后，我们要求 IPtables 进行伪装

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

编辑1

安装

sudo apt-get install isc-dhcp-server

配置

sudo nano -w /etc/dhcp/dhcpd.conf

# Sample /etc/dhcpd.conf
# (add your comments here) 
default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.254;
option domain-name-servers 192.168.1.1, 192.168.1.2;
option domain-name "mydomain.example";

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.10 192.168.1.100;
range 192.168.1.150 192.168.1.200;
}

重启服务

sudo service isc-dhcp-server restart

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