Ubuntu Networking :: MAC Address Changes After Every Reboot?
Dec 17, 2010
I have a problem w/ the LAN connection: the MAC address appears to be different after every reboot. I checked it w/ the ifconf command and looked for the eth0 hardware address. I am using Ubuntu 10.10 on ASUS K51AE laptop. The Fax/Modem/LAN/WLAN interface is integrated 802.11 b/g/n (I only have problem with the LAN connection).
Currently I cannot use my modem internet connection, it is really annoying. I would like to keep on using Ubuntu, but if I cannot find a solution I will have to return to windows...
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Feb 22, 2011
How would i detect the ip address from where the reboot command been given to linux host.
My linux host details are as below.
Code:
# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: EnterpriseEnterpriseServer
Description: Enterprise Linux Enterprise Linux Server release 5.2 (Carthage)
Release: 5.2
Codename: Carthage
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Aug 15, 2010
I need to save mac address (that I already changed it) even when I reboot.
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Aug 2, 2011
I need to know how to send message (or execute script ) when the linux machine shutdown or reboot stage.
Actually I want to start a backup linux machine when main server shutdown or Reboot.
simply, how we can run script while init 0 OR init 6 command
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Feb 24, 2010
Currently my OS is Ubuntu 9.04 Jaunty Jackalope Desktop OS and my web server is Apache2. I have a public address 60.x.y.z and my pc local address is 10.x.y.z. I have a web app in my Apache2 which currently run in localhost(10.x.y.z).
I would like to enable the web app so that it could be browse from outside. I know there maybe some port forwarding process and some commands involved in order to do that. But I have no idea on the steps to do that.
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Jan 7, 2011
Unfortunately accidentaly I disconnected my usb drive my computer and my VMs run from so I just rebooted for a quick fix Now I can't open virt-manager locally and the VM's can't get network connections I see this in the logs after the last two reboots
Code:
grep lxc /var/log/messages |tail -n 2
Jan 7 00:45:04 F820 libvirtd: 00:45:04.524: warning : lxcStartup:1895 : Unable to create cgroup for driver: No such device or address
Jan 7 11:52:53 F820 libvirtd: 11:52:53.325: warning : lxcStartup:1895 : Unable to create cgroup for driver: No such device or address
[code]...
I tried restarting libvirtd after with no love so I rebooted and cgroup was gone this was a clean install of F14, after this started I brought the system current, I can provide the packages installed but they errors didnt change
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Dec 16, 2010
Version 10.04 LTS. Installed desktop version and network worked but I needed a static IP address and the install configures for a DHCP configured address. I tried changing to static address using the System->Preferences->Network Connections application but was unable to get the system to come up with the network up.
So I manually modified the /etc/network/interfaces and the /etc/resolv.conf files. I restart the system but when I do an ifconfig, I don't see a configured IP address on eth0 (only the loopback address). If I run /sbin/ifup eth0 everything then works fine and ifconfig shows the correct address bound to eth0.
My files are as follows:
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Mar 12, 2011
I'm running Ubuntu 10.10 and I'm having problems trying to assign it a static IP address. No matter what I put in the Preferences->Networking area (identifying the interface as Manual)... it still will query DHCP for an address if I run the dhclient command. I'm using to using ubuntu server where I just set the IP in the interfaces config file.
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May 12, 2011
I am working on implementing a protocol on NS2.34 .I really need help to solve this problem . Actually , I don't now whether the problem is generated by the tcl code or the c++ code when I run the simulation, I get this result :
Code:
num_nodes is set 64
INITIALIZE THE LIST xListHead
34
45
channel.cc:sendUp - Calc highestAntennaZ_ and distCST_
highestAntennaZ_ = 1.5, distCST_ = 550.0
SORTING LISTS ...DONE!
code....
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Apr 24, 2010
Consider the following program:
Code:
#include <stdio.h>
#include <stdint.h>
[code]...
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May 7, 2010
I am running my own Postfix mail server. Some time ago I noticed that most email was rejected because of the server's dynamic IP address. So I got a fixed IP address. However then I noticed that some mails got rejected due to failing the reverse DNS check. So my ISP told me to get a range of IP addresses and they could then create a PTR record for one of those addresses. That is now running but it turns out that the IP address used for the PTR record is a ... dynamic IP address. So Spamhaus PBL rejects my emails again.
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Oct 6, 2010
In my job I use some ethernet embedded devices. They take an ip address from dhcp server or auto ip. I only know mac address.How can I obtain ip from mac address? In other words I need a rarp packet generator.
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Jun 7, 2009
I have a few external IP's assigned to me by my ISP. I have IPcop as my router/firewall. I am wondering how to bind 1 of my external ip's to my internal ip address. So I do not have to port forward, etc. For Example, 77.77.77.77 to 192.168.1.123 and on the server it see's the external IP address.
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Oct 28, 2010
I dont know for what reason, since 2 days, I started having this message whenever I try to start httpd.I commented "Listen 443", restarted httpd started correctly. I needed to comment "listen 443" in order to be able to start httpdWhat is strange is when I do
Code:
telnet mylinux 443
it responds
[code]...
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May 29, 2011
how to assign a address to my ethernet card all the options available
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Jan 18, 2010
I have a dedicated control computer that can only be accessed with web-browser (with its ip-address). My DHCP-server gives a static ip-address to the control computer (base on its mac-address). Somehow and after some time the control computer looses its ip-address (can't ping to it any more) ... and then I have to reset the control computer to get it to pick up the ip-address ... this is not a good solution since the control computer is not nearby. is there a way to force the control computer to renew its ip-address based on its mac-address
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Apr 18, 2011
My security software has picked up multiple port scanning detections on my router/network and only the IP addresses are available. Is it possible to find out what the remote mac address is to see if the IP source has been spoofed? I've got a couple of different IP sources which were found scanning my ports.
I don't know if my IP and the remote IP address are on the same network or subnet for that matter which is the reason for my wanting to know what the mac address is to find out if its coming from the same remote machine.
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Oct 1, 2010
how to get the mac address from given ip address
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Feb 27, 2010
I've had my wireless networking (on an Acer Aspire laptop) working perfectly well for at least six months.Now, quite suddenly, after a reboot I get the message from wicd, "No wireless networks found". I probably was running a week or so before that without needing a reboot. Windows wireless is fine (I'm using it to send this post).In addition, my sound stopped working and I see a fleeting message to the effect that the sound system is reverting from analog to digital.I'm running Kubuntu 9.10. My guess is that something in a recent round of updates knocked me out of the box. How can I proceed to set things aright?
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Jul 6, 2011
I have one router, a linksys. It allows wireless and wired connections, as is normal. I have two XP machinesby wire to the router and three linux machines connected wirelessly. The XP machines both have IP addresses beginning with 192.168. while my three linux machines have IP addresses that all begin with 172. None of the machines is connected with a static IP address. All are automatic DHCP.I am told that the above scenario makes no sense. However, such is what I have so, I trust, the theory and the fact do not gel. I would not care except that I cannot see - using the nautilus network servers program, all of the XP computers with some of my linux boxes.
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Jun 8, 2010
i know exactly what i need to do, im just not familiar enough with command line to do it properly.i have 7 computers.the first 4 are connected to a router via wireless at one end of the house. of the last 3 only 1 will be able to access the router via wireless, so it needs to share it's one wireless connection via ethernet. this computer i'm going to call 'server'server will have two IP'swlan0 192.168.1.6 this connects to the router that has internet access.eth0 i intend to have the following settingsip:192.168.0.1sub: 255.255.0eth0 will connect to a second router, where the cat5 cable goes from the server, into the internet port of the router where i will define the router's static IP:IP: 192.168.0.100sub: 255.255.255.0gateway 192.168.0.1i have then set the router IP for LAN handling as 192.168.27.1 and all ethernet connections will have a 192.168.27.x IP.
so i need to know how to, without a gui application, use the terminal to assign server eth0 a proper IP address, and tell the server to take the connection it has and share it through eth0 to supply internet for the last 2 computers via ethernet.i had it set up in this way with a windows machine being the one that had the wifi access, but i'd rather have it setup for the ubuntu server to do this task. security is imperative for these 3 remaining machines, so just getting 2 more wifi adapters for a connection to the initial router isn't an option.the 2 that connect to server do so through SSH and though server IS connected via wireless it only makes outward connections through
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Apr 7, 2010
i want to get IP Address of users behind NAT..(192.x.x.x)is it possible?the topology:wireless AP using NAT (192.x.x.x) => Local Area Network (172.x.x.x) => Internet
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Sep 14, 2009
Im an academic (university networks and security lecturer) studying/teaching network and operating system security, and inspired by the work of Hovav Shacham set about testing ASLR on linux. Principley I did this by performing a brute force buffer overflow attack on Fedora 10 and Ubuntu 9. I did this by writting a little concurrent server daemon which accidently on purpose didnt do bounds checking.
I then wrote a client to send it a malicious string brute forcing guessed addresses which caused a return-to-libc to the function usleep with a parameter of 16m causing a delay of 16 seconds as laid out in [URL] Once I hit the delay I new I had found the function and could calculate delta_mmap allowing me to create a standard chained ret-to-libc attack. All of that works fine. However .... To complete my understanding I am trying establish where I can find the standard base address for ubuntu 9 (and other distros) for the following, taken from Shacham:-
Quote:
[code]....
/proc/uid/maps gives me some information but not the base address ldd also gives me the randomised starting address for sections in the user address space but neither gives me the base address. Intrestingly ... when a run ldd with aslr on for over (about) 100 times and checked the start point of libc I determined that the last 3 (least significant) hex digits were always 0's and the fist 4 (most significant) where between 0xB7D7 and 0xB7F9. To me this indicated that bits 22-31 were fixed and bits 12-21 were randomized with bits 11-0 fixed. Although even that doesnt define the boundaries observed correctly.
Note: I am replicating the attack to provide signatures to detect it using IDS, and for teaching purposes. I am NOT a hacker and if needed to could reply from my .ac.uk email address as verification.
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May 4, 2011
I'm working with Linux 2.6.23 on an embedded device and am receiving the following error executing the reboot command.
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Oct 7, 2010
I am using sda1 as /, which is a bootable drive. I do not know if my problem is that I did not create a /boot drive. After removing the iso dvd, I tried to reboot and I get this back: -bash: /sbin/reboot: input/output error Then it returns me to the terminal prompt.
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May 31, 2010
I have just removed ndiswrapper and installed Realtek RTL819se!! How ever after I restarted I lose my wifi and have to do change directory to use ./wlan0up to get it working again.
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Sep 11, 2010
I made some updates and rebooted (out of necessity due to an old, mysterious glitch that made my keyboard stop working, along with cursors in text and most menus) and my laptop's networking stopped working altogether. Trying to access my home's wireless network only got me a "disconnected - you are now offline" after a long wait, which has happened before, but A) never before right after a reboot, B) the wired connection didn't work either when I tried it, which has never happened to me, and C) this persisted after another reboot.
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Mar 23, 2011
I've seen other posts on this issue, but don't know if they were ever resolved. I've tried some of the suggestions but none seemed to apply.Flavor - 10.10 Issue - Access via VNC after reboot
All in all, I have had nothing but success with Ubuntu, being that I'm no to it, but knowing what I need, I can usually find the solution. My problem is accessing via VNC after a reboot. The issue is the keys (keyring)
Router is setup for SSH on 22 for PuTTY to work, 5900 for VNC to work. If I am at the machine and login, VNC is possible from outside. Should I be running a different server other than the Remote Desktop that is included?
Is there a way to login via SSH to unlock the GUI to allow VNC access? I would not even bother with GUI, but I'm not there yet with the CLI To all that have suggested I learn it, believe me I'm working on it. All of us out there that have the Swindows syndrome have an uphill battle. I can't be the only one up against this. If anyone who has serious skills could take 5 minutes and peek. I can't think of any other information that I could supply. If there is,
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Apr 22, 2011
I have an Ubuntu Desktop machine that I have to frequently access remotely - sometimes after it has rebooted. I'm not concerned about physical security for the machine but I am concerned about remote security.
Since normal VNC isn't activated until after the login, what is the best way to go about remotely accessing this machine's desktop without having hands on it?
I've tried setting auto-login but then I run into the keyring not unlocked problem. Disabling the keyring or setting a blank password seems like a bad idea.
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May 12, 2011
I have a Compaq Presario M2000 with a Broadcom BCM4306 wifi card with Ubuntu 11.04
I did the following commands and the wifi works perfect, but after reboot I have to run the commands again?
Code:
~$ sudo apt-get install b43-fwcutter
Code:
~$ sudo apt-get install b43-fwcutter firmware-b43-installer
[Code].....
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