配置OpenWRT 校园网实现 IPv4 over IPv6。 - XiZi's Blog
配置OpenWRT 校园网实现 IPv4 over IPv6。
目前网络状况：两个位置：位置1和位置2，位置1可以正常访问IPv6网络（校内和校外），位置2可以访问IPv6和IPv4网络。
目的：实现位置1处无差别上网，即正常访问IPv4和IPv6网络，关键是IPv4。
基本原理：通过openvpn路由所有的IPv4数据给远程电脑。
基础设施：位置1处路由器（mdir-615）,位置2处做好路由和openvpn（）监听IPv4和IPv6地址。
1、基础准备。配置位置2处的电脑，做好openvpn服务器，使用正常的客户端测试openvpn的连通性。网上教程很多，这里不做具体说明了。
2、路由的openwrt配置。这里使用我的DLink dir615 为例说明。
1）刷openwrt，这里需要提到一点，我的dir615刷openwrt，ie11和chrome都不能刷，下了个firefox4可以。
2）安装必备的软件包，由于我的dir615闪存只有4m，所以都不能安装图形界面，还有后面选择polarssl和popenvpn-polarssl，也是次原因，完全命令行操作。必备的软件包有： kmod-tun,liblzo,libpolarssl,openvpn-polarssl。
3）配置
（1）配置/etc/config/system
config system
option hostname OpenWrt #路由器的名称
option timezone CST-8 #时区,这个就是Asia/Chongqing，也就是中国的时区。
config 'led' 'wlan_led' #这个是我的dir615配置无线led灯的
option 'name' 'WLAN'
option 'sysfs' 'd-link:green:wlan'
option 'trigger' 'netdev'
option 'dev' 'wlan0'
option 'mode' 'link tx rx'
config 'led' 'wan_led' #段配置wan口led灯
option 'name' 'WAN'
option 'sysfs' 'd-link:green:wan'
option 'trigger' 'netdev'
option 'dev' 'tun0'
option 'mode' 'link tx rx'
（2）配置/etc/config/network
config interface 'wan'
option ifname 'eth1' #指定wan口网卡
option proto 'none' #这个地方配置修改为none，我们不需要ipv4网络
option macaddr '00:24:01:76:B2:27' #这句指定wan口的mac地址。
config interface 'ovpn' #这段内容是我们增加的，为后续的防火墙做准备。
option ifname 'tun0' #openvpn使用的interface名称
option proto 'none' #这里也不用配置，他的网络是由程序配置的。
（3）配置/etc/config/firewall
#对wan区域增加我们配置的openvpn，ovpn我们上面刚配置的名字。
config zone
option name wan
list network 'wan'
list network 'wan6'
list network 'ovpn' #增加这一行把openvpn增加的wan区域里面，否则即使你连接上了，路由器可以正常上网，但局域网客户端不能上。
option input REJECT
option output ACCEPT
option forward REJECT
option masq 1
option mtu_fix 1
（4）配置dns解析服务，这里我们修改/etc/dnsmasq.conf
#在文件尾部增加DNS服务器，越靠下优先级越高 server=2001:4860:4860::8844 # google ipv6 public dns server=2001:4860:4860::8888 # 同上 server=xxx.xxx.xxx.xxx # 学校IPv4 DNS
(5) 关于openvpn的配置，由于我们没有IPv4网络，redirect gateway回出现错误失效，我们手动添加路由即可。 /etc/config/openvpn
config openvpn sample_client
# Set to 1 to enable this instance:
option enabled 1
....
#插入以下段到你配置的openvpn client 配置部分
list route "0.0.0.0 0.0.0.0"
（6）顺便把无线的配置也贴出来吧。/etc/config/wireless
config wifi-device radio0
option type mac80211
option channel 11
option hwmode 11ng
option path 'platform/ath9k'
list ht_capab SHORT-GI-40
list ht_capab DSSS_CCK-40
option htmode HT20
# REMOVE THIS LINE TO ENABLE WIFI:
# option disabled 1 #注意这里原来是没有前面那个#的
config wifi-iface
option device radio0
option network lan
option mode ap #无线工作模式，ap路由，sta客户端
option ssid myssid #OpenWrt #默认是OpenWrt改为你想要的名字
option encryption psk2 #none #默认是none改为你想要的加密方式，psk，psk2，wep等
option key password #当然是密码喽。
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