The following is the situation - I have an ADSL router with both ethernet and wifi interaces. I also have access to two dual-boot machines (with Windows 7 and Ubuntu Lucid). A few days back, the phone lines went down and the internet stopped working. Even after the phone lines started working, the internet remained down(or so I thought). However, I today noticed that internet is accessible on Ubuntu, but not Windows. I tried resetting the router, using the ethernet interface, but internet is not accessible on both machines on Windows.
I have also noticed that ping times to the router are very high from Windows but not from Ubuntu, even when using the ethernet interface (in the order of several hundred ms). I suspect some routing trouble therefore, but am not positive. Also, for some reason my ISP guys ask me to change TCP MTU from 1500 to 1492 bytes, which might be the cause of the trouble.
Can somebody help me here?
Here is the output of route PRINT from one of the machines (192.168.1.1 is the router, 192.168.1.3* are client machines):
===========================================================================
Interface List
15...00 1e 4c dc 3f 5f ......Bluetooth Device (Personal Area Network)
13...00 1c bf 8b 55 99 ......Intel(R) PRO/Wireless 3945ABG Network Connection
12...00 23 ae b4 f1 b4 ......Broadcom NetLink (TM) Fast Ethernet
1...........................Software Loopback Interface 1
16...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
10...00 00 00 00 00 00 00 e0 Microsoft Teredo Tunneling Adapter
17...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2
18...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.33 25
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
192.168.1.0 255.255.255.0 On-link 192.168.1.33 281
192.168.1.33 255.255.255.255 On-link 192.168.1.33 281
192.168.1.255 255.255.255.255 On-link 192.168.1.33 281
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.33 281
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.33 281
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 192.168.1.1 Default
===========================================================================
IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
13 281 fe80::/64 On-link
13 281 fe80::d50f:a099:a9bc:3d99/128 On-link
1 306 ff00::/8 On-link
13 281 ff00::/8 On-link
===========================================================================
Persistent Routes:
None
