Skip to main content

networking - Stubborn APIPA Issue (possible IPv4 problem, IPv6 = okay?)


I have one Windows 7 desktop that seems to be stuck on an APIPA address. It can see the other computers in the workgroup, but seemingly only communicate via IPv6 (see below), and can't access outside the LAN. The problem began today after completing a Windows update. Troubleshooting so far has already included:


-Ipconfig release/renew
-Uninstalling/reinstalling the NIC driver
-Checking device manager for "hidden" NIC drivers (none)
-Flushing DNS and ARP
-Resetting winsock and ipv4 using netsh
-Manually assigning an IP address on my subnet
-Doing a system restore to before the Windows update
-Restarting DHCP client service
-Disabling Windows Firewall
-Unloading TrendMicro
-Malware Bytes scan

I tried unplugging the ethernet cable from that PC and putting it in a laptop and it connected fine, got a proper IP, and connected to the internet (yes, I disabled WiFi on the laptop before testing).


Currently, when I try to ping another legitimate address on the network or the router (192.168.0.1), I'm getting:


PING: transmit failed. General failure.

Interestingly, when I ping the NetBIOS name of another host, it works, but it is running the ping over IPv6.


I then tried to ping -4 [host name], which returned:


Ping request could not find host [host name].

Also, an ipconfig/release returns this:


An error occurred while releasing interface Local Area Connection : An address has not yet been associated with the network endpoint.

An error occurred while releasing interface Loopback Pseudo-Interface : The system cannot find the file specified.

I am stumped! I hope somebody has a suggestion short of a fresh Windows install or replacing the NIC.



Answer



Well I left MalwareBytes "Full Scan" running over night and when I returned in the morning there was one infected file "Backdoor.bot" that the "Quick Scan" didn't pick up. As soon as I cleaned it the problem resolved itself.


Comments

Post a Comment

Popular Posts

How do I transmit a single hexadecimal value serial data in PuTTY using an Alt code?

I am trying to sent a specific hexadecimal value across a serial COM port using PuTTY. Specifically, I want to send the hex codes 9C, B6, FC, and 8B. I have looked up the Alt codes for these and they are 156, 182, 252, and 139 respectively. However, whenever I input the Alt codes, a preceding hex value of C2 is sent before 9C, B6, and 8B so the values that are sent are C2 9C, C2 B6, and C2 8B. The value for FC is changed to C3 FC. Why are these values being placed before the hex value and why is FC being changed altogether? To me, it seems like there is a problem internally converting the Alt code to hex. Is there a way to directly input hex values without using Alt codes in PuTTY? Answer What you're seeing is just ordinary text character set conversion. As far as PuTTY is concerned, you are typing (and reading) text , not raw binary data, therefore it has to convert the text to bytes in whatever configured character set before sending it over the wire. In other words, when y...
Post a Comment
Read more

linux - Extract/save a mail attachment using bash

Using normal bash tools (ie, built-ins or commonly-available command-line tools), is it possible, and how to extract/save attachments on emails? For example, say I have a nightly report which arrives via email but is a zip archive of several log files. I want to save all those zips into a backup directory. How would I accomplish that? Answer If you're aiming for portability, beware that there are several different versions of mail(1) and mailx(1) . There's a POSIX mailx command, but with very few requirements. And none of the implementations I have seem to parse attachments anyway. You might have the mpack package . Its munpack command saves all parts of a MIME message into separate files, then all you have to do is save the interesting parts and clean up the rest. There's also metamail . An equivalent of munpack is metamail -wy .
Post a Comment
Read more

performance - Single Threaded Qaud Core v.s Hyper-Threading Dual Core

Let's say we have two CPUs, One is Quad Core 3.2 Ghz with 4 Cores, and We have a Dual Core 3.2 Ghz with 2 Cores with 2 threads in each Core (Hyper-Threading). My assumption as a programmer will be, the 4 cores 4 threads should perform faster than 2 cores 4 threads since the second CPU needs to switch between threads in order to emulate 4 cores while the first one doesn't need to perform such switching as each core can perform independently and individually. I want to confirm that my assumption is true, if not please explain why one is better than the other. Answer I do believe thats true - since hyper threading does share some elements - specifically the main execution resources, you'll be able to run 4 full threads at once, rather than waiting for those resources to be freed up. The point of HT is to get better performance with a smaller use of die area - your quad core would generally be a bigger chip - say almost twice as large, than a non HT dual core chip, while a HT...
Post a Comment
Read more

freeze - How do I stop windows 8.1 from freezing when the screen locks

This happens to me on a regular basis if I leave the computer for upwards of 10 minutes. It didnt do so at first but started after a couple of days. This is possibly related to further windows updates although nothing seems to tie in obviously when looking at my update history. I have to hold the power button in to power off. If the screens have switched off aswell they wont come back on, if they haven't I see the login picture and can move the mouse pointer but nothing happens and no combination of keyboard mashes or mouse clicks lets me see the login prompt. In the event log (type event viewer into the start menu) under system before every Critical problem (me powering down the machine without restarting) I get distributedCOM errors talking about this guid: "The server {BF6C1E47-86EC-4194-9CE5-13C15DCB2001} did not register with DCOM within the required timeout." I also get the same error for this 1B1F472E-3221-4826-97DB-2C2324D389AE. This seems to be a common theme and...
Post a Comment
Read more