Centos 8 / connection drops

Community Support
1

Just randomly, I cant connect to my Linux machine (172.25.7.133) from my macpro at
home (172.25.44.43). Ping gives:

PING 172.25.7.133 (172.25.7.133): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
64 bytes from [172.25.7.133]: icmp_seq=0 ttl=64 time=2093.088 ms
64 bytes from [172.25.7.133]: icmp_seq=1 ttl=64 time=1088.943 ms
64 bytes from [172.25.7.133]: icmp_seq=2 ttl=64 time=86.394 ms
Request timeout for icmp_seq 5
64 bytes from [172.25.7.133]: icmp_seq=6 ttl=64 time=2.992 ms
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
Request timeout for icmp_seq 9
etc.

Sometimes when this happens, ping is completely dead. Other times,
intermittent like this.

Zerotier info:
Status on Linux:
200 info 2da055267f 1.10.1 ONLINE

Status on Mac:
200 info 86ebe1687e 1.10.1 ONLINE

I have to solve the issue by ssh’ing into another box. From there I can get into the linux box, sudo reboot,
after which all is working again. For a bit. Today it worked for a few
hours before happening again.

Any idea how to troubleshoot this?

2

Check the CPU% of the Linux box… pretty sure that it’s at 95%-100% when this happens.
Seeing the behaviour on 2 Almalinux boxes as well as on a Raspberry. Full loss of connection with max CPU, a restart of ZT solves it for some time.
See also:

3

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