请问外网的mDNS包如何传到docker container里

xhx321

我的host机器是FC27. dockers container里运行了一个mDNS的服务。
请问外网的mDNS请求怎么能被收到，并回复出去啊？

如下是 Ethernet 的接口
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:25ff:feb2:3a7a  prefixlen 64  scopeid 0x20<link>
        ether 02:42:25:b2:3a:7a  txqueuelen 0  (Ethernet)
        RX packets 83  bytes 10808 (10.8 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 59  bytes 8537 (8.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.101  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::ac5b:b42d:5388:9b2e  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:f5:e5:8e  txqueuelen 1000  (Ethernet)
        RX packets 24177  bytes 20256635 (20.2 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7958  bytes 695922 (695.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1206  bytes 114388 (114.3 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1206  bytes 114388 (114.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
vetha6f8ec5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::fcb3:bbff:fe78:c72d  prefixlen 64  scopeid 0x20<link>
        ether fe:b3:bb:78:c7:2d  txqueuelen 0  (Ethernet)
        RX packets 34  bytes 4602 (4.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 16  bytes 2298 (2.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0