General :: Networking - Changing MAC Address In A Machine (fedora 8)
Jun 24, 2010
I am doing a test on MAC learning and for that ,I need to change my MAC address of linux machine while the interface is UP. To be more clear, consider eth1 in a fedora core 8 machine. And while the interface is UP. I am running a script which changes the MAC address from 10:1:1:1:1:1 to 50:50:50:50:50:50 (i.e 50 times MAC address is changed) . When I try to change the MAC address when the interface it UP, it gives me the following error :
siocsifhwaddr : device or resource busy
I know the way of changing the MAC address by bringing down the interface but I need to know if this can be done while the interface is UP.
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Mar 1, 2011
in our server, Fedora 10 64 bit in this,IP Address is automatically changing Actually IP Address is 192.168.1.50 it changing frequently.if i try to edit that to normal it is not showing options. net mask is also is changing from 255.255.255.0 to 24 After reboot the system ,through LAN it is accessible .But not through the network.
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Feb 21, 2009
I am using Fedora 10 and when I first installed my machine, I had a DHCP assigned address to my network card. Later on I decided that I wanted to give my machine more of a server role, so I switched to static IP using the system-config-network utility. What happened after that was that I did change the IP address and routing information, but DNS information gets lost at every reboot, so I need to type it back again.
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Mar 31, 2009
I tried to authenticate using ntlm proxy authentication service and my computer could not retrive the IP address. Currently I am using fedora cammbridge
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May 20, 2009
Is there any tool or command where I can track down the IP-ADDRESS of a machine within the subnet using its MAC-ADDRESS .
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Feb 11, 2010
I want to make make my fedora machine access-able over the internet. I want to assign IPV4 address to this machine( I already have one IP address ) which can be used for this. What configuration changes I need to make in fedora to make it accessable to the external world
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Aug 3, 2010
I am struggling with what might be a minor problem. I have a home computer which I would like to setup as a webserver and hence give it a static IP address. It is connected to by wire to a router that is connected to the WAN via PPPOE. If I enable the network card on DHCP it works fine in browsing the web. If I now set it to static IP address it does not brown. Essentially I use the command setup to run the static IP setup. I then set my IP address to 192.168.254.X , the subnet mask 255.255.255.0 and the default gateway to 192.168.254.1 (this is the router connected to the WAN). I am able to ping the router, however when I try and browse on static it does not work. Your help will be most appreciated as this has taken way too long to solve and I have Googled as much without success.
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Apr 12, 2011
I'm running Ubuntu server. To change the IP while I'm sitting in front of the computer, I would:
1. edit /etc/network/interfaces
2. ifdown eth0
3. ifup eth0
Remotely, I can do the first two no problem, but the ifup command causes some problems since the ethernet interface is no longer functioning. Is there some kind of script that can be written for this purpose? Maybe something that will check eth0 every so often and make sure it is running and bring it up if it isn't. Or else a script run with nohup?
I do not intend that changing the IP address will be a frequent occurrence, but when it needs to be done, it must be done reliably and without the possibility that the computer will no longer be reachable for more than a couple minutes or so.
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Sep 3, 2010
Why changing of mac address isn't recommended? The possible reasons that I can find is:
1) it can break firewalls
2) it can break some DHCP implementations ?
Is there any other reasons that I have missed ?
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Jan 24, 2011
I have a school project that requries me to bypass MAC filtering by changing my MAC address.I changed my mac address through the following:
Code:
sudo service network-manager stop
sudo ifconfig wlan0 hw ether 00:11:22:33:44:55
[code]....
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Sep 30, 2009
Router: Linksys WRT54GS
NIC: D-Link DWA-645 (RangeBooster N 650 NoteBook Adapter)
i have successfully changed my MAC address. By doing:
ifconfig wlan0 down
ifconfig wlan0 hw ether AA:BB:CC:11:22:33
ifconfig wlan0 up
When I do:
ifconfig wlan0, it shows my new MAC address.
After changing, I cannot connect to the Internet. I have already disable mac filtering in my router. What did I miss out?
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Jun 23, 2011
I've two WLAN AP's with both a different IPv6 subnet. When I change from one AP to the other, my IPv6 Global address stays valid and so is the default IPv6 gateway. After a while I get another Global address from the second AP's subnet and another default IPv6 gateway for the second subnet. Both have the same metric. IPv6 connectivity is broken now. When I disable wireless on the laptop and reenable it, it flushes all IP addresses and receives new ones and connectivity is restored. Does anyone know if this is normal behaviour or should it normaly flush all the addresses when changing network? It's a bit silly to have to disable/enable wireless all the time..
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Apr 6, 2009
I'm just an undergrad with duck tape and google searches to hold this place together. Anyways on to my question. Where I work, we have a tape library but no way to configure it, the backup software simply talks to the robot to load and unload tapes. There is a network port on the library and I do have the software, but have been running into problems getting access. I was wondering, is there a way to determine the ip address of this machine by plugging in a cross over cable with a laptop and scanning it? What tools could I use to do this?
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Apr 12, 2010
My ISP can give me up to 5 ip addresses. Is it possible to "forward" one of them to a machine to get rid of nat? I was thinking of "forwarding" one public ip to my machine and let the rest of the network share one ip using nat.
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Jul 21, 2011
If I change the primary ip address for DNS, do I need to reboot the server?
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Mar 31, 2009
I need to know what the Iptables "code" is to change the outgoing/Incoming IP for port 53 (DNS). I'm running CentOS on a dedicated server. I very familiar with Putty and SSH. So I don't need much details, I just can't figure this out. I asked my server providor but they deleted my ticket and didn't answer me.I tried this but am not sure if this correct of working?
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Dec 8, 2010
My ISP allows only one computer so I have to change the mac address.
On the other computer I use ubuntu and I've changed my mac address with both ifconfig and macchanger. The internet still doesn't work, it doesn't find the connection.
What should I do ?
[URL]
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Mar 9, 2010
I am running Ubuntu 8.04, and I am able to access my machine via SSH, but I only want the log in screen visible on the machine itself, yet still able to work with the SSH. But to do this, I have to log in, get the IP address, log off, then log in via SSH. How do I make the machine receive an IP address during the boot-up!
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Dec 18, 2010
i want to know mac address of a particular ip but the problem is that i am unable to ping that ip but that ip is being used by someone in my local network that i know from my proxy logs. i want to know the mac address of that ip,
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Feb 22, 2010
I want to setup 1Gbps our lab network and we purchased 'Buffulo Giga layer switch ' with 24ports. Is there a way to tell DHCP to assign specific IP to a particular MAC address of a machine ? We want to use DHCP and whatever the port we use ,it should have same IP ..
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Nov 17, 2010
I have an odd thing going on with DNS. I have two machine's running Ubuntu and for some reason they do not always resolved internet addresses on my Internet connection. This has gone on since the Ubuntu 8.04 when I first started using Ubuntu. Anyway, I use OpenDNS' DNS servers and I have been running perfectly.
This is what is odd. My Windows XP Machine never has the problem. It always resolves. Does Windows Possibly have some Microsoft hosted DNS server hard coded in there as a backup? Things are working fine this way so I am not looking to change. I am just a little puzzled and finally got around to asking, "Why is this".
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Jan 11, 2011
#1: Where can I assign a static IP address on my lubuntu box?
#2: Also, is it possible to see the lubuntu box from a Windows machine? If so, how does that work?
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Mar 1, 2010
I am accessing a remote DB using JDBC from inside a java program. is there any terminal command with which I can see the remote machine's ip/mac address?
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Feb 11, 2009
I have installed Ubuntu 8.10 Server Edition on Virtual Box. When I start the virtual machine I do not have connection to my home network. The router I have does not assign any IP address to this machine. Now I have some questions which I am finding hard to find answers for over the internet and other forums.
If I do have a network interface (I checked this using ifconfig -a) then is there a command to actually make the operating system connect to that network (something like repair on windows)?? Also what is the difference between a network interface with alias eth0 and eth5? I know that when it was eth0 the virtual machine used to connect to the network automatically. Now that it is eth5 it does not! I do not know however if this is related.
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Feb 20, 2011
I have an issue with the manner in which Network Manager is configuring the network and short of ditching Network Manager I can see no solution.The issue : Getting a machine to update its machine name in the DNS serverSounds simple doesn't it I operate a FreeBSD based firewall / DHCP / DNS server, using a default Network Manager DHCP configuration the Fedora clients do not register their names with the DNS server when they obtain an address.
I have traced the communications with Wireshark and the Fedora clients are NOT supplying the PC's hostname as part of the exchange so this is NOT a DNS server configuration issue. If I uncheck the option 'Automatically obtain DNS information from provider' under the DHCP settings the Fedora clients DO register the hostname that is put into the Hostname (optional) databox. They do NOT however store the DNS server IP address or any other records defined by the DNS server.
Is there some hidden settings or is this a bug because it isn't acceptable 'DHCP' behaviour if it isn't possible to automatically set DNS server IP addresses and at the same time register the hostname during the DHCP negotiation. Before it is said I know I can use a fixed DNS IP address but am not prepared to long term, I am also not prepared to define the Fedora clients with a 'static' IP. I am similarly not interested in playing around with scripts or any other such 'frigs' to achieve what should be a standard activity - registering a host with DNS during the DHCP negotiation.
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Aug 20, 2010
If I need to adjust my network settings (rc.inet1.conf) on the fly, like if I need to be in the local network of a router I just bought (192.168.1.x), in order to change the subnet to the rest of my network (192.168.0.x), then I need to adjust the ip address of my slackware box. Up till now I have rewritten the rc.inet.conf file and then restarted the computer. I am almost positive that restarting is unneccesary, but I have not been successful in finding any other method. Maybe I am using the tool wrong, but I have tried using wicd to disconnect and then connect again once I change the rc.inet1.conf. I don't think it worked. I think I have also tried issuing a rc.inet1 restart. But I don't think that this changed my ip address either. How do you change your ip address on the quick without restarting your box?
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Mar 14, 2010
I am coming across a strange error with my gateway. When I do a "ping", this is what I get below:
k-63a5b848c6cb4:~ # ping simba
PING simba.gateway.2wire.net (192.168.1.69) 56(84) bytes of data.
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=1 ttl=64 time=0.041 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=2 ttl=64 time=0.029 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=3 ttl=64 time=0.023 ms
64 bytes from k-63a5b848c6cb4 (192.168.1.69): icmp_seq=4 ttl=64 time=0.015 ms
Is the gateway doing something strange?
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Jun 7, 2010
Is there any way where I can change the "from" address in the maillogs without
changing the envelop sender.
We have email users using smtp-auth with multiple email accounts but authenticating against single user account.So whenever a user sends mails through our server from any one of his multiple mail accounts,I want to be able to change the "From address" to the user he is authenticating against instead of the "from address" which he supplies, in the maillogs.
We have mimedefang running on our system,I tried using things like change_envelope_sender functions,but it only changed the envelope sender and did'nt change anything in the maillogs.
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Aug 28, 2009
this seems silly but I am changing ISPs and need to change my notification email address (for here). Under User Menu -> Edit account it shows my email but does not allow me to change my email. Since I am able to post I assume I am logged in correctly. So what did I miss?
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Jan 2, 2011
I am connecting to linux server(RHEL4.7) using putty from my windows machine. Is there any way to get the ip address of my windows machine using C program in linux.
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