I have two Ethernet devices:

  • One is with a netmask set to
  • The other is with a netmask set to

Why can't I reach the second device from the first one (Even if the devices are directly connected by Ethernet one to the other) ?

I got a time out if I try to ping Only ARP works.

  • 1
    Are you sure you mean "why can I reach" and not "why can't"? The rest of the wording of your question (and the likely reality) suggests the latter...
    – Mintra
    Apr 18, 2023 at 12:56
  • You are right ! I've updated my question. Sorry about taht
    – Manitoba
    Apr 18, 2023 at 15:00

2 Answers 2


I got a time out if I try to ping Only ARP works.

That is to be expected. When tries to ping, it expects it to be "on link" = sharing the same broadcast domain. It ARPs the destination, succeeds and send an ICMP echo request.

The echo request is received by, but trying to send the echo reply it requires a gateway in between - is not part of Failing that, the reply cannot be sent and the ping times out.

  • Thanks for your precise message. I understand now !
    – Manitoba
    Apr 18, 2023 at 15:01

Remember that IP addresses are always unique. The host is configured with a /24 subnet mask, which means it sees as on a different subnet. You need a router to route between subnets.

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