windows 7 - Slow ping on one machine

07
2014-04
  • Firzen

    We have 13 computers connected to Windows 2008 Server R2 Domain. There is Windows 7 64-bit Professional on all of them. The computers have same configurations and are quite fast (Intel Core i3, fast SSD, gigabit ethernet, etc..). All computers have same antivirus and firewall with same configuration, and other software is also nearly the same.

    But one of the computers have very slow ping in LAN. The ping at this computer varies from 1 to 600 ms. On the other computers, ping is fast - lower than 1ms.

    I will reduce the problem to two computers from our LAN. We have:

    • PC A with good ping
    • PC B with slow ping

    And now one strange thing: When I ping A from B, the ping responses are slow. But when I ping B from A, responses on A are fast.

    I have tried to deactivate firewall, and logon as administrator, but there is no difference..

    What can cause slow ping?

    Thanks in advance

    • Answers
  • Keltari

    Replace the ethernet cable on the machine that is slow. The cable sounds like it is damaged.

  • Robert

    I'd bet that the nameserver settings are different on B. Try pinging using the IP address rather than the hostname, it should be the same speed on both PC's. Make sure that B does not use a wrong primary nameserver, it most likely causes the delay when trying to resolve.


    • Related Question

    windows 7 - How can one machine ping another, but the reverse ping doesn't work
  • SteveC

    I've got two VMware Workstation virtual machines running ...

    Virtual A can ping the host laptop most of the time, other real machines on my home network all of the time, but it gets a "request timed out" for virtual B

    Virtual B can ping the host laptop most of the time, and the machines, both real and virtual A all of the time

    The only difference I know of is virtual B has been joined to my works domain, whereas virtual A is still in workgroup mode

    Can anyone explain how / why this is occurring ?

    Update ... these are all while my laptop is on wireless
    Ping from ... host laptop (win7, workgroup)

    • To other machine on network (win7, workgroup) - OK
    • To virtual A (win2008 r2, workgroup) - mainly OK, do go some Request timed out
    • To virtual B (win7, domain) - just get Request timed out

    Ping from ... virtual A

    • To other machine on network - OK
    • To virtual B - OK
    • To host laptop ... goes through pattern of a few Request timed out, next ping takes 2000ms, then next few take <1ms, then a Destination host unreachable and back to Request timed out

    Ping from ... virtual B

    • To other machine on network - OK
    • To virtual A - OK
    • To host laptop ... similar pattern of a few Request timed out, next ping takes 2000ms, then next few take <1ms, and back to Request timed out ... but no Destination host unreachable

    Ping from ... other machine on network

    • To virtual A - OK
    • To virtual B - just get Request timed out
    • To host laptop ... OK

    I find it very puzzling that the virtual machine seem to have a hard time pinging the host laptop which they are running on, but are fine with another real machine on the network ?


    • Related Answers
  • William Hilsum

    I think what Barlop says in comments is the most likely cause.

    Your question asked why this is happening... When you connect to a network, Windows asks you to select a location - public, home or office.

    Each profile has different default firewall walls, although I don't remember them blocking ping by default other than on Windows Server (but, I am probably wrong - been a while since I last looked).

    That being said, all of these settings can be overwritten by group policy, so, a network administrator may have chosen to lock down the machine.

    In any way, unless this is enforced/made so that you can not overwrite it, it is pretty trivial to change.

    -edited this section -

    The default domain profile does block ping by default...

    Click on the Start Orb and type "Windows Firewall" (or as much as needed) and then when it comes up in the results, click on Windows Firewall with Advanced Security. From here, click on Inbound Rules and look for File and Printer Sharing (Echo Request - ICMPv4-In) and simply enable it...

    ... but, it should be enabled already for the private and public profiles... Look for the one above it that says "Domain" in the profile column and simply click enable in the action bar on the right.