Can't ping localhost over IPv4 only IPv6

dbaldaro · Apr 14, 2011

I am trying to get to the bottom of several networking issues, but just been thrown a curve-ball - so hoping someone can help.

I have a BT HomeHub v2 acting as Firewall and DHCP
I have a QNAP NAS and several devices (mostly Windows 7 and iOS devices)

The vast majority of my networking setup seems OK - however on one Windows 7 laptop I am having problems.

The Laptop can 'see' remote shares, access the Internet and ping other devices on the network - however remote devices cannot ping the laptop.

Whilst trying to ascertain what could be the cause I thought that I would ping 'localhost' on the laptop - after all, it should be able to see itself!

If I force ping using the loopback address, then this is my result

Code:

C:\Users\david>ping 127.0.0.1

C:\Users\david>ping 127.0.0.1

Pinging 127.0.0.1 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 127.0.0.1:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

However, if I try with forcing it to IPv6 then I get,

Code:

C:\Users\david>ping localhost -6

Pinging London [::1] with 32 bytes of data:
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms

Ping statistics for ::1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

Why is it that I can ping using IPv6 and not IPv4? Could this be the cause of my issues. I.E the fact that other devices cannot ping the laptop.

As far as I know I have not set anything up differently.

Clinkz · Apr 14, 2011

Firstly make sure IPv4 is checked under control panel > network and sharing center > change adapter settings > right click the adapter used for connectivity and select properties.

To be safe renew your DHCP address :

ipconfig /release
ipconfig /renew

Also could you post the results of an ipconfig /all ?

Thanks

dbaldaro · Apr 14, 2011

IPv4 was all checked, and working as I could ping the default router, but not the localhost.

I found a part resolution with running the command:

Code:

netsh interface ipv4 reset

Which effectively resets all the IPv4 settings.

So now, I can ping localhost, and all works. Which is good.
Just that I am back to my original problem, nothing else on the network can ping the laptop.

Clinkz · Apr 14, 2011

Believe it or not,resetting the TCP/IP stack was my going to be my suggestion for your localhost problem. Though it would still be useful if you could post the results of the ipconfig /all command.

I would suggest going to the following website and following the instructions to enable ping.

dbaldaro · Apr 15, 2011

Thanks Clinkz. I have followed the advice in that link, and created an inbound rule for Ping Requests. I have also tried after disabling the firewall.

Below is the results of ipconfig /all

Code:

Windows IP Configuration

   Host Name . . . . . . . . . . . . : London
   Primary Dns Suffix  . . . . . . . : 
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : home

Wireless LAN adapter Wireless Network Connection 6:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter #5
   Physical Address. . . . . . . . . : 00-27-10-B1-18-75
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : home
   Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6200 AGN
   Physical Address. . . . . . . . . : 00-27-10-B1-18-74
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::51c9:e797:2c56:5d02%27(Preferred) 
   IPv4 Address. . . . . . . . . . . : 192.168.1.93(Preferred) 
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : 15 April 2011 08:41:03
   Lease Expires . . . . . . . . . . : 16 April 2011 08:41:16
   Default Gateway . . . . . . . . . : 192.168.1.254
   DHCP Server . . . . . . . . . . . : 192.168.1.254
   DHCPv6 IAID . . . . . . . . . . . : 738207504
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-53-53-A7-5C-26-0A-13-43-AE
   DNS Servers . . . . . . . . . . . : 192.168.1.254
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection* 13:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : xmpie.com
   Description . . . . . . . . . . . : Check Point Virtual Network Adapter For Endpoint VPN Client
   Physical Address. . . . . . . . . : 54-43-2D-2B-A5-15
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection* 12:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Check Point Virtual Network Adapter For SSL Network Extender
   Physical Address. . . . . . . . . : 54-B8-02-C3-26-13
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
   Physical Address. . . . . . . . . : 5C-AC-4C-FD-5A-B1
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : home
   Description . . . . . . . . . . . : Intel(R) 82577LM Gigabit Network Connection
   Physical Address. . . . . . . . . : 5C-26-0A-13-43-AE
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{1473E993-6FAC-4925-83B7-1626AF414F5D}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{11869B56-9918-48EC-878C-43EDACC53C2E}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{8A2E224C-9740-4902-B0F0-0223CD6FE4AF}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fd:49c:1dbd:a967:b970(Preferred) 
   Link-local IPv6 Address . . . . . : fe80::49c:1dbd:a967:b970%14(Preferred) 
   Default Gateway . . . . . . . . . : ::
   NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.xmpie.com:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.home:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : home
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #6
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

dbaldaro · Jan 8, 2012

This issue is back to haunt me. I need to Remote Desktop into this Window 7 laptop (same as the OP), but I cannot establish a connection. All the Remote Desktop option are correctly set - but I still cannot PING the laptop from another server on the same network, although the laptop can ping the server!

This is incredibly frustrating, as I seem to be allowed outbound connection (Ping, RDP, UPNP etc.) but nothing seems to be getting back in. I have disabled the firewall as well, but this has no effect.

Anyone have any ideas?

cluberti · Jan 8, 2012

Try disabling the 6to4, Teredo, and ISATAP adapters on both hosts - if you aren't using anything that requires IPv6 and/or IPHTTPS (like DirectAccess), you can do this safely:

Code:

netsh interface 6to4 set state state=disabled
netsh interface isatap set state state=disabled
netsh interface teredo set state state=disabled
ipconfig /flushdns
ipconfig /registerdns

These 5 commands (you'll need an elevated cmd prompt on Win7 or 2008R2 to execute these commands successfully) will disable a machine's ability to go out to the internet and get a public IPv6 address, and then (hopefully, within 15 minutes) register the IPv4 address it is using with the DNS server it's configured to use on your domain. If you do the above, wait 15 minutes, and try to ping again, you should be able to ping (and it should work) IPv4 addresses on each end.

dbaldaro · Jan 9, 2012

Thanks for the input cluberti. I disabled all those, and run the commands. Rebooted, left it 15 minutes, but still cannot ping the laptop from any other device on the same network, although the laptop can ping the others.

cluberti · Jan 9, 2012

After running those commands, can you post the IP configuration from ipconfig on the laptop and also from another device on the network that you're trying to access? It'd be interesting to see what you've got (remove anything incriminating as necessary

).

dbaldaro · Jan 9, 2012

OK - After talking it through with another individual, I uninstalled all the network adapters, re-installed, and reset the TCP/IP Stack - so I back at a default config, that should work!

For the sake of this I am using two platforms:

Windows 7 Professional Latpop - called 'LONDON'
Windows 7 Ultimate Desktop PC - called 'PRAGUE'

The IPCONFIG from 'Prague' is ...

Code:

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : home
   Link-local IPv6 Address . . . . . : fe80::c579:2fea:585e:2a4a%10
   IPv4 Address. . . . . . . . . . . : 192.168.1.120
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254

Tunnel adapter Local Area Connection* 11:

   Connection-specific DNS Suffix  . : 
   IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fb:100a:3574:a964:c437
   Link-local IPv6 Address . . . . . : fe80::100a:3574:a964:c437%11
   Default Gateway . . . . . . . . . : ::

Tunnel adapter isatap.home:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : home

The IPCONFIG from 'London' is

Code:

Wireless LAN adapter Wireless Network Connection 6:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Wireless LAN adapter Wireless Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : home

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : home
   Link-local IPv6 Address . . . . . : fe80::391f:8f25:1768:733b%20
   IPv4 Address. . . . . . . . . . . : 192.168.1.64
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Ethernet adapter Local Area Connection* 13:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : {{REMOVED MY OP}}

Ethernet adapter Local Area Connection* 11:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Whilst on the laptop, 'London' I can ping 'Prague' fine, both using IPv4 and IPv6

Code:

C:\Users\david>ping prague

Pinging PRAGUE.home [192.168.1.120] with 32 bytes of data:
Reply from 192.168.1.120: bytes=32 time=1ms TTL=128
Reply from 192.168.1.120: bytes=32 time=1ms TTL=128
Reply from 192.168.1.120: bytes=32 time=1ms TTL=128
Reply from 192.168.1.120: bytes=32 time=1ms TTL=128

Ping statistics for 192.168.1.120:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 1ms, Average = 1ms

C:\Users\david>ping prague -6

Pinging Prague [fe80::c579:2fea:585e:2a4a%20] with 32 bytes of data:
Reply from fe80::c579:2fea:585e:2a4a%20: time<1ms
Reply from fe80::c579:2fea:585e:2a4a%20: time<1ms
Reply from fe80::c579:2fea:585e:2a4a%20: time<1ms
Reply from fe80::c579:2fea:585e:2a4a%20: time<1ms

Ping statistics for fe80::c579:2fea:585e:2a4a%20:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

But when on the PC, 'Prague'

Code:

C:\Users\david>ping london

Pinging london.home [192.168.1.64] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.1.64:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Users\david>ping london -6

Pinging London [fe80::391f:8f25:1768:733b%10] with 32 bytes of data:
Reply from fe80::391f:8f25:1768:733b%10: time<1ms
Reply from fe80::391f:8f25:1768:733b%10: time<1ms
Reply from fe80::391f:8f25:1768:733b%10: time<1ms
Reply from fe80::391f:8f25:1768:733b%10: time<1ms

Ping statistics for fe80::391f:8f25:1768:733b%10:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

The same is true if I try to remote desktop into the laptop, 'London'. I can do it whilst using a IPv6 address, but not when it defaults to IPv4.

I have never seen it when IPv4 fails, when IPv6 succeeds. What is going on with my IPv4 traffic?

cluberti · Jan 9, 2012

Can you disable (as previously) the IPv6 components on both, and then ping -4 again whilst gathering a network trace on "Prague" via wireshark? DNS appears to be working, but it'd be interesting to see what's happening on the wire. Is it safe to assume firewalls are currently disabled while testing right now on both ends?

dbaldaro · Jan 9, 2012

Thanks - will do that now. How would you like the trace sent to you? Shall I just upload it somewhere, or can I DM or email it to you?

cluberti · Jan 9, 2012

Zip and upload it somewhere, and link it here, if you would please.

dbaldaro · Jan 9, 2012

OK it's here for a short period of time. http://dl.dropbox.com/u/9379658/ping_request.pcap
Will remove it after you have taken a look.

cluberti · Jan 9, 2012

I have it, reviewing now.

cluberti · Jan 9, 2012

Indeed, no responses to ICMP requests, or even SYN requests to create a session. I do see that IP address sending broadcast browser messages and DROPBOX discovery protocol broadcasts, which is odd. Are you certain the firewall is disabled on 192.168.1.64?

dbaldaro · Jan 9, 2012

Firewall is disabled on 'London' (Laptop) for private networks (which it is on). Dropbox client was running in the background so that makes sense to see those broadcasts I guess. Anything else that I can run/test?

thynan · Jan 18, 2012

Hi,
i had exactly the same problem (but i needed some frustrating hours to locate it.. first i only tried to find out why remote desktop doesnt work. None of the solutions worked of course because the problem was the IPv4 ping..)

The solution for me was quite specific: I had the program "Checkpoint Endpoint Security" installed. After i uninstalled it, pinging on IPv4 worked again. YAY!!

Just switching Endpoint Security of didn't work, because apparently Endpoint Security automatically installs a firewall which keeps running even if the program itself is switched off.

I then reinstalled the program with INSTALL_FIREWALL=NO from the command line. Now pinging and remotedesktop work, even if Endpoint Security is installed and running.

Don't know if this helps anyone, but if you dont have the program installed, maybe its another little program that blocks the pings, and not a problem in your network configuration.

dbaldaro · Jan 18, 2012

thyman - you are a star!
That only went and worked. I had Checkpoint Endpoint VPN client installed, and when I removed that it worked!
RemoteDesktop now works, as does ping!
Thank-you once again.

eeree · Mar 9, 2012

Hi there,
I had the same problem. Symantec Norton 360 was the problem. All I had to do was to tun Norton Removal Tool and all was good then. Download it from Symantec servers here:
https://www-secure.symantec.com/nor...10133834EN&product=home&version=1&pvid=f-home

Can't ping localhost over IPv4 only IPv6

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