why zookeeper bind 0.0.0.0 at miti-homed server?

$ netstat -lnp | grep 99
...
tcp        0      0 0.0.0.0:9900            0.0.0.0:*               LISTEN
   16536/java
tcp        0      0 0.0.0.0:9910            0.0.0.0:*               LISTEN
   16536/java
...

i deploy 3 zookeeper on the same server for test.
zoo.cfg
------------------------------
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=5
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=2
# the directory where the snapshot is stored.
dataDir=/data/zookeeper/data
# the port at which the clients will connect
clientPort=10000
clientPortAddress=172.27.31.48
server.1=172.27.31.48:9900:9910
server.2=172.27.31.48:9901:9911
server.3=172.27.31.48:9902:9912

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