I had the same problem as Jim, but slightly different. Ahh.
BTW. I have NO QHOSTS Trojan on my Computer, I just
checked with the symantec tool.
Here is my solution to my problem.
My Network:
-----------
- Win 2000 PRO (German) with a DHCP connection to my ISP
through cable modem and a LAN connection to my Intranet.
- Win 2000 PRO (English) had problems as described by Jim.
- Redhat Linux 9.0 (English) had problems as described by Jim.
- Windows XP Home (English) NEVER had any problems
connecting ANYWHERE, very strange!!!
- ALL IP addresses in my Intranet where configured
statically, using "192.168.220.xxx/255.255.255.0".
How do I check the MTU size in a Windows 2000 PRO machine?
----------------------------------------------------------
1. Start -> Run
2. Type "rededit"
3. Navigate in the tree to:
-
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}\[ID_for_Adapter]\Connection
4. Verify there the name of your connection and write down
[ID_for_Adapter]
5. Navigate in the three to:
-
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\[ID_for_Adapter]
6. Checkt there te MTU keword. If the keyword MTU does not
exist the default value is being used.
How do I change the MTU size in a Windows 2000 PRO machine
to 576 (decimal)?
----------------------------------------------------------------------------
1. Follow the above procedure, then
- If the MTU keyword does not exists:
- Right-click the right side of the screen
- click "New"
- click "DWORD Value"
- name the value MTU
- double-click on the newly created key.
- change the "Value of Data" to 576
- check "Decimal" on "Base" checkbox.
- If the MTU keyword exist:
- double-click on the "MTU" key.
- change the "Value of Data" to 576
- check "Decimal" on "Base" checkbox.
-----Original Message-----
I'm pretty sure. I've had this problem for months and no trojan
horses detected by McAfee. Today I installed a new
computer withHow do I check the MTU size in a Redhat Linux
9.0 machine?
----------------------------------------------------------
1. Open the file
"/etc/sysconfig/networking/devices/ifcfg-[your_adapter]
2. See entry "MTU=xxxx". If the entry "MTU" does not exist
the default value is
being used.
How do I change the MTU size in a Redhat Linux 9.0 machine
to 576?
------------------------------------------------------------------
1. Follow the above procedure.
- If entry does not exist:
- create a "MTU=576" entry at the end of
the file.
- If entry does exist:
- cahnge entry "MTU=xxxx" to "MTU=576".
2. Save file.
My Solution
-----------
1. I checked the Windows 2000 PRO (German) machine's MTU
size of both adapters,
Intranet and ISP. It was 576 (decimal) for both, which is
the minimum common used MTU size. I did NOT change anything.
2. I checked the MTU size of the Windows 2000 (English)
machine, and it did NOT
have any MTU size; therefore, I assumed it used the default
size of 1500. I created a new MTU entry in the registry and
set it up to 576 (decimal).
3. After that I had NO PROBLEMS with the Windows 2000 PRO
(English) machine.
4. I checked the MTU size of the Redhat Linux 9.0 (English)
machine, and it did
NOT have any MTU size; therefore, I assumed it used the
default size of 1500. I
created a new MTU entry in the config file
(/etc/sysconfig/networking/devices/ifcfg-eth0) and set it
up to 576.
5. After that I had NO PROBLEMS with the Redhat Linux 9.0
(English) machine.
6. The Windows XP Home (English) machine needed not
configuration, it works without problems, very strange.
References:
-----------
-
http://securityresponse.symantec.com/avcenter/venc/data/trojan.qhosts.html
-
http://support.microsoft.com/?id=314825
-
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/ref-guide/