我在校园网络中有两台计算机。他们可以互相 ping 通。我可以使用ssh一个连接另一个，但是当我同时使用clockdiff两个时都显示host is down.有什么不对的吗？
系统是ubuntu 20.04, 5.4.0-42-generic
xgb@initiator:~$ ping 10.16.108.229
PING 10.16.108.229 (10.16.108.229) 56(84) bytes of data.
64 bytes from 10.16.108.229: icmp_seq=1 ttl=114 time=0.381 ms
64 bytes from 10.16.108.229: icmp_seq=2 ttl=114 time=0.591 ms
64 bytes from 10.16.108.229: icmp_seq=3 ttl=114 time=0.589 ms
--- 10.16.108.229 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2035ms
rtt min/avg/max/mdev = 0.381/0.520/0.591/0.098 ms
xgb@initiator:~$ sudo clockdiff 10.16.108.229
............................clockdiff: 10.16.108.229 is down