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    Some checks: First, does the workstation have a netmask 255.255.255.0? Second, does either computer have two Ethernet ports (maybe you enabled the wrong device)? Third, can each computer ping itself? Finally, is there any chance you have a software firewall (likely iptables) enabled on either computer?
    – Steven
    Commented Apr 4, 2017 at 17:19
  • 3
    Please post the routing tables of both pcs, ip route show. Commented Apr 4, 2017 at 17:20
  • The two computers need to have static IP addresses.
    – harrymc
    Commented Apr 4, 2017 at 18:12
  • Is this Gigabit Ethernet? What does ethtool eth0 show on both ends? Commented Apr 4, 2017 at 19:15
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    definitely check netmask. Ping requires that an ARP conversation happens first. ARP requires that both machines be in the same network, which is defined by netmask. If you're getting Host Unreachable it is likely that the ARP conversation is failing. Check ARP table for the other machine's IP and see if there is an entry.
    – MaQleod
    Commented Apr 5, 2017 at 1:10