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Discussion Starter · #1 ·
hi.

lost Internet connectivity at home. connected via dsl line to my isp.

when i issued ipconfig /all command i noticed that default gateway IP addr was a global ip addr. (77.36.x.x) instead of the usual private address 192.168.1.1. DHCP server had IP address 58.206.x.x

when i issued ping 192.168.1.1 command, i got this output: "reply from 77.36.x.x: destination host unreachable"

i couldn't access my router's configuration menu by typing 192.168.1.1 in web browser's address field.

it's very interesting, because i had network issues before but could access my router's config menu and ping it. but now, i cannot reach my local router but receive reply from ISP's router. how come?

just curious :D
 

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hi.

lost Internet connectivity at home. connected via dsl line to my isp.
bit lost here.....how did you originally have internet at the house?
 

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Discussion Starter · #5 ·
it was a temporary (~ 5 minutes) network outage. it just happened while i was browsing the internet. connection came up again by itself. wasn't tampering with PC/router/cable whatsoever!

i am interested only in technical reasons of this issue.

could it be that NAT on my local router stopped working and my PC became "directly connected" to ISP's router? or some other fault on my local router? if i receive reply from ISP router that destination host unreachable, it means that ISP router lost connection to my home router, right?
 

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Open a (black) Command Prompt window:
Hold the Windows logo key and press r; in the Run box type cmd and click on OK.

Type the following command:

IPCONFIG /ALL

[Note that there is no space between the slash and ALL.]

Right click in the command window and choose Select All, then hit Enter.
Paste the results in a message here.

If necessary use a text file and removable media to copy the results to a computer with internet access.
 

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Discussion Starter · #8 ·
jmwills - UPnP is indeed enabled on the local router. Disabled it now, but still cannot see how the potential exploit of UPnP service could have caused my PC to lose connection to the home router and receive ismp echo replies from ISP router directly...

Terry - here is the excerpt from ping and ipconfig /all output:

C:\Users\Kiedis>ping 192.168.1.1

Pinging 192.168.1.1 with 32 bytes of data:
Reply from 77.36.x.x: Destination host unreachable.
Reply from 77.36.x.x: Destination host unreachable.
Reply from 77.36.x.x: Destination host unreachable.
Reply from 77.36.x.x: Destination host unreachable.

Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

C:\Users\Kiedis>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : B_rSchw
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : CC-AF-76-72-DA-84
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
Physical Address. . . . . . . . . : CC-AE-78-72-D6-84
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : B8-70-F5-E4-01-05
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::a1de:2001:8bfe:4220%11(Preferred)
IPv4 Address. . . . . . . . . . . : 77.36.x.x(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.192.0
Lease Obtained. . . . . . . . . . : 2012 m. spalio 3 d. 19:46:59
Lease Expires . . . . . . . . . . : 2012 m. spalio 3 d. 19:51:59
Default Gateway . . . . . . . . . : 77.36.x.y
DHCP Server . . . . . . . . . . . : 58.206.x.x
DHCPv6 IAID . . . . . . . . . . . : 246968564
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-EF-DA-67-B8-70-F2-E7-01-02

DNS Servers . . . . . . . . . . . : 212.59.x.x
212.59.x.x
NetBIOS over Tcpip. . . . . . . . : Enabled
 

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Disabling DHCP on your local router in effect, turned off the firewall/NAT routing between you and the internet, This would have been the same as plugging your laptop into the modem directly.

Imagine what someone could do with direct access to your system and according to your ipconfig output, it is still off.
 

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The modem is connected to a router LAN port instead of the WAN port, or the router is in AP mode, or the router is defective.
 

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Discussion Starter · #11 ·
thank you, jmwills. i am more enlightened now :)

not quite sure what you meant with "it is still off", but the output i pasted here is ~ 2hrs old, i.e. when i had that temporary connectivity issue. now everything is up and running smoothly.
 
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