Ping a Mac's IP, it always lost about 30% packet

Like this,

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test1deiMac:~ test1$ sudo !!

sudo ping 10.1.0.163 -f

Password:

PING 10.1.0.163 (10.1.0.163): 56 data bytes

.^C

--- 10.1.0.163 ping statistics ---

49827 packets transmitted, 49826 packets received, 0.0% packet loss

round-trip min/avg/max/stddev = 0.127/0.224/1.283/0.033 ms

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test1deiMac:~ test1$ sudo ping 10.1.0.157 -f

PING 10.1.0.157 (10.1.0.157): 56 data bytes

..Request timeout for icmp_seq 250

.Request timeout for icmp_seq 251

.Request timeout for icmp_seq 252

.Request timeout for icmp_seq 253

......

.Request timeout for icmp_seq 1100

.Request timeout for icmp_seq 1101

.Request timeout for icmp_seq 1102

^C

--- 10.1.0.157 ping statistics ---

1104 packets transmitted, 750 packets received, 32.1% packet loss

round-trip min/avg/max/stddev = 0.122/0.205/0.750/0.038 ms

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10.1.0.163 is a Linux machine with CentOS.

10.1.0.157 is my Mac pro(2014).


I also found that It was always timeout from "icmp_seq 250".


And,all of my Mac machines(09 iMac,11 Mac mini,14 Mac pro,18 iMac and virtual machine) behave like this.

Noooo...It's not 30%.....................
Once in a while,It can succeed to send 250 packets.

Found it!


test1deiMac:~ test1$ sysctl -a | grep net.inet.icmp.icmplim

net.inet.icmp.icmplim: 250

Ping a Mac's IP, it always lost about 30% packet
 
 
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