上海电信桥接IPTV 4K Openwrt配置

1. Openwrt 4.14老核心才有"交换机"配置

2. 新建vlan 51, 85，tagged绑定到所有lan和wan端口（主路由和接入交换机均需要配置），无需enable IGMP Snooping

3. 主路由配置DHCP，/etc/dnsmasq.conf

   `# 125必须，60不必须看机顶盒，有的机顶盒需要18和25

   # 此配置适合 ZTE B860a

   dhcp-option-force=125,00:00:00:00:1a:02:06:48:47:57:2d:43:54:03:04:5a:58:48:4e:0a:02:20:00:0b:02:00:55:0d:02:00:2e:3c:1e:00:00:01:00:02:03:43:50:45:03:0e:45:38:20:45:50:4f:4e:20:52:4f:55:54:45:52:04:03:31:2e:30

   dhcp-option=15

   dhcp-option=28

   dhcp-option=60,00:00:01:06:68:75:61:71:69:6E:02:0A:48:47:55:34:32:31:4E:20:76:33:03:0A:48:47:55:34:32:31:4E:20:76:33:04:10:32:30:30:2E:55:59:59:2E:30:2E:41:2E:30:2E:53:48:05:04:00:01:00:50`

4. 重启dnsmasq服务，/etc/init.d/dnsmasq restart