0 can ping, but can't ping

subnet masks are on all hosts in question

Switch/gateway in the middle ( can ping both of these addresses, and it also contains a correct ARP entry for

When I run tracert on, pointing to I get a tracert response:

1 1 ms <1 ms <1 ms

2 <1ms <1 ms <1 ms

But there is no tracert response when I point it to When I check the wireshark trace for ICMP responses - there are none! Looks like the gateway is not responding to ICMP packet sent to that remote address at all.

What else can I check? Any ideas?

UPDATE: Both and have the same default gateway defined. I can ping from but not from

UPDATE 2: When I change IP address on the 'difficult' host from to everything works well! When I change it back to .240 it stops responding to pings from the other subnet. What is causing it? We are running a bit short on IP addresses, so it would be good to know why .240 doesn't work.

  • Check that the 240 host has the correct default gateway.
    – Ron Trunk
    Aug 27, 2017 at 11:22
  • Yes, it does. Thank you for the comment - will add it to the answer
    – Tony Sepia
    Aug 27, 2017 at 11:23
  • Can you ping the other way? Does the host have a firewall ?
    – Ron Trunk
    Aug 27, 2017 at 11:23
  • added updates to the question!
    – Tony Sepia
    Aug 27, 2017 at 11:40
  • (ICMP) Filtering on the gateway router or switch?
    – Zac67
    Aug 27, 2017 at 12:24

1 Answer 1


We have cleared ARP table on both hosts and the switch. That has somehow resolved the problem, despite the fact that we have previously manually checked that the ARP table on the switch contains a correct entry:

show ip arp | grep 0.240

  • You should accept your answer so that the question doesn't keep popping up forever, looking for an answer.
    – Ron Maupin
    Sep 26, 2017 at 17:11

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