Re: Discrepancy in ping behavior between Darwin BSD and Linux

[Sirio Balmelli]

Thank you very much.

192.168.255.254 was deliberately picked to be a private-sector address that my 
router would black-hole, but this example will work with *any* unreachable IP.

Here is an example with an unreachable public IP:


$ # unreachable public IP correctly times out
$ ping -c 1 --timeout 5 149.14.210.192
PING 149.14.210.192 (149.14.210.192): 56 data bytes
--- 149.14.210.192 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss
$
$ # same unreachable public IP shows a response when another working instance 
of ping is live
$ ping -c 1 --timeout 5 149.14.210.192 & ping -c 1 1.1.1.1
[1] 68536
PING 1.1.1.1 (1.1.1.1): 56 data bytes
PING 149.14.210.192 (149.14.210.192): 56 data bytes
64 bytes from 1.1.1.1: icmp_seq=0 ttl=55 time=106.868 ms
--- 149.14.210.192 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 106.868/106.868/106.868/0.000 ms
64 bytes from 1.1.1.1: icmp_seq=0 ttl=55 time=106.869 ms
--- 1.1.1.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 106.869/106.869/106.869/0.000 ms
[1]+  Done                    ping -c 1 --timeout 5 149.14.210.192
$


Hope this helps, please let me know how else I can assist.

best,

Sirio

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Wednesday, December 8th, 2021 at 6:45 PM, Alfred M. Szmidt <ams@gnu.org> 
wrote:

> Where is 192.168.255.254 routed on Darwin?
>
> I.e., what does say:
>
> ping -c 1 192.168.255.254
>
> Or traceroute.