Reply From < IP address >: Destination Host Unreachable

ping

This is the first time I've delved into this and stumped as to what is causing the issue. I've setup a network as follows:

DC: 10.1.1.20
SRV-A: 10.1.1.22
SRV-B: 10.1.1.24
SRV-C: 10.1.1.26
SRV-D: 10.1.1.28

I am able to ping all servers except SRV-C to SRV-D and vice versa. I get the below error:

Reply From 10.1.1.26: Destination Host Unreachable
Reply From 10.1.1.26: Destination Host Unreachable
Reply From 10.1.1.26: Destination Host Unreachable
Reply From 10.1.1.26: Destination Host Unreachable
…
Reply From 10.1.1.28: Destination Host Unreachable
Reply From 10.1.1.28: Destination Host Unreachable
Reply From 10.1.1.28: Destination Host Unreachable
Reply From 10.1.1.28: Destination Host Unreachable

I have disabled the firewalls, changed IP addresses and rebooted the machines but nothing seems to work.

Could someone please help?

Thanks.

Best Answer

First, be absolutely sure these pc's actually have these IP Addresses. Also be sure no other pc or device uses these ip adresses. If you have a DHCP server, make sure this is not giving out IP Addresses in this range.

If all this works, see if these servers can ping other servers, such as the domain controller. It is likely that a cable is unplugged if a server has no connectivity at all.

But if a server can ping another but not a third, and the same applies for that server, it is more likely there's a duplicate ip issue. For example, both servers could actually have the same ip.

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