Strange problem: no Internet access till another computer is also connected on the same network

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rakija_user

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Nov 25, 2013
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Hello,
I have a problem with Internet connection on my computer. I don`t have Internet access till somebody else is also connected on the same network. My computer obviously likes to have company :). Other computers on the same network don`t have this problem.
Does somebody has the solution to this problem?
System is win10 and computer is connecting to the Internet through Sitecom WiFi USB adapter AC1200. Adapter driver is updated, and I've had the same problem with another network adapter.
Thanks for any help!
 
Solution
Ralston18
Thank you.

The ipconfig /all for WITHOUT INTERNET ACCESS clearly shows that your computer is unable to obtain an IP address as shown by the self-assigned 169.254.33.30 IP address used when that happens.

When internet works the Sitecom Wifi adapter is working as expected; ipconfig for example shows the ip address to be 192.168.1.68

So what are the differences:

WITHOUT internet access I see one tunnel adapter isatap described as Microsoft ISATAP Adapter #3

Also please notice that WITH internet access that the IPv6 addressing is in place. No so with respect to the WITHOUT internet access.

What I think is happening is that for some reason your computer is not able to make the usual IPv4 connection. However if another computer is on...
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R

rakija_user

Honorable
Nov 25, 2013
8
0
10,510


Router model is o2 Box 6431

THE RESULT OF "ipconfig/all" WITHOUT INTERNET ACCESS:
Host Name . . . . . . . . . . . . : lonivan-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Ethernet:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
Physical Address. . . . . . . . . : 78-24-AF-89-02-ED
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter LAN-Verbindung* 17:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #6
Physical Address. . . . . . . . . : 66-D1-A3-41-ED-2B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter WLAN 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Sitecom WiFi USB adapter AC1200
Physical Address. . . . . . . . . : 64-D1-A3-41-ED-2B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::1000:48c5:7727:211e%23(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.33.30(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 392483235
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1E-12-FC-C0-78-24-AF-89-02-ED
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap.{D949B0A0-8500-4B2B-8BF2-05D9F8CBA3EC}:
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



THE RESULT OF "ipconfig/all" WITH INTERNET ACCESS:
Host Name . . . . . . . . . . . . : lonivan-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : localdomain
Ethernet adapter Ethernet:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
Physical Address. . . . . . . . . : 78-24-AF-89-02-ED
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter LAN-Verbindung* 17:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #6
Physical Address. . . . . . . . . : 66-D1-A3-41-ED-2B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter WLAN 2:
Connection-specific DNS Suffix . : localdomain
Description . . . . . . . . . . . : Sitecom WiFi USB adapter AC1200
Physical Address. . . . . . . . . : 64-D1-A3-41-ED-2B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::1000:48c5:7727:211e%23(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.68(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, October 13, 2016 3:58:36 PM
Lease Expires . . . . . . . . . . : Thursday, October 20, 2016 3:58:43 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 392483235
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1E-12-FC-C0-78-24-AF-89-02-ED
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter LAN-Verbindung* 14:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6abd:2486:36b0:b1cd:2e80(Preferred)
Link-local IPv6 Address . . . . . : fe80::2486:36b0:b1cd:2e80%21(Preferred)
Default Gateway . . . . . . . . . : ::
DHCPv6 IAID . . . . . . . . . . . : 352321536
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1E-12-FC-C0-78-24-AF-89-02-ED
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter isatap.localdomain:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : localdomain
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
 
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Ralston18

Ralston18

Titan
Moderator
Oct 11, 2014
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3,323
146,290
Thank you.

The ipconfig /all for WITHOUT INTERNET ACCESS clearly shows that your computer is unable to obtain an IP address as shown by the self-assigned 169.254.33.30 IP address used when that happens.

When internet works the Sitecom Wifi adapter is working as expected; ipconfig for example shows the ip address to be 192.168.1.68

So what are the differences:

WITHOUT internet access I see one tunnel adapter isatap described as Microsoft ISATAP Adapter #3

Also please notice that WITH internet access that the IPv6 addressing is in place. No so with respect to the WITHOUT internet access.

What I think is happening is that for some reason your computer is not able to make the usual IPv4 connection. However if another computer is on the network then your computer succeeds by using IPv6 protocols - possibly by finding/deriving the necessary information via that computer's presence.

WITH internet access I see two tunnel adapters 1) Tunnel adapter LAN-Verbindung *14, description = Microsoft Teredo Tunneling adapter and 2) Tunnel adapter isa.localdomain, description = Microsoft ISATAP Adapter #2

And I also noted that the description in "WITHOUT" ended in #3 versus "WITH" being #2

I also noted that the Sitecom adapter's " Connection-specific DNS Suffix was blank in "WITHOUT" but given as" localdomain" in "WITH".

There are some other differences in the provided "ipconfigs". Unfortunately I am not well-versed in IPv6 not really having the need to work with it per se. So to avoid creating too much confusion I will forego addressing things that may not be relevant from afar.

But my guiding sense is that there is simply a configuration error somewhere and I would start by looking at and verifying the IPv4 and IPv6 configuration settings on your computer(s). Make sure that you match the router's and network settings. If your IP does not provide IPv6 and/or you do not use it anywhere then uncheck the protocol to simplify things.

You want your computer to look to the router and only the router for its IP address(es).

And perhaps the above will help someone else identify a specific, easily applied fix.





 
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Solution
R

rakija_user

Honorable
Nov 25, 2013
8
0
10,510
it was a problem with my router! i bought a new router and now is everything working perfectly. thank you very much for your help, it helped me to better understand how everything works and to find a solution to this problem.

Cheers!!!
 
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