Debian :: Block A Router From Giving Me A Dhcp Address
Aug 18, 2011
I get assigned an IP from the university's server. Every now and then, a student will plug in his router to the network trying to get wifi in his/her room.
And by doing so will start assigning IPs on the network, while rendering useless the university dhcp server, which has to cope with a higher number of pc's.
How can I specify to dhclient (or the linux system in general) NOT TO obtain IP addresses given by a specific mac address ?
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Jan 24, 2009
I noticed that my internet connection wasn't automatically brought up each time I logged into Fedora so I opened the system-config-network tool and edited my network adapter by checking the box marked "automatically start at boot/login." To my surprise, the connection went down and upon trying to click on the device to let the manager bring up the connection the greyed-out phrase "device not managed" appeared underneath the device name and wouldn't allow me to connect.
Even when I used ifconfig/dhclient to get the connection up nothing happened. I could get the router to assign an IP address through DHCP, pinged a few sites to make sure it was legit, but still couldn't use firefox to browse anything. Seems as if network manager GUI is conflicting with command line attempts to bring the network up. I'd like to permanently disable system-config-network if possible because it's acting screwy!
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Jan 31, 2010
I've only been using linux for a few days so I don't know all the tricks. I'm pretty savy configuring windows networks however.My adapter is (according to windows) a: CNet PRO200WL PCI fast ethernet adapterLinux says it is a: 21x4x DEC-tulip compatible 10/100 EthernetI do seem to be getting an ip address from the DHCP router, but I cannout ping any other ips or connect to the internet.I've tried a bunch of different options, switching things back and forth, but it still doesn't work, and honestly i don't even know what some of the options mean.
ALSO, if this helps:
paladin:~ # ifconfig eth0
Eth0 Link encap:Ethernet HWaddr 00:08:A1:03:3C:99
[code]....
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May 20, 2011
Hey guys. I have a client computer PXE booting from my host computer and it is supposed to give the client the ip address 172.16.0.100 however instead it gives it the ip address 172.16.0.208.
I have this set up working with two other computers and there is no noticeable difference other than mac addresses for the network card.
Here is an extract from my '/etc/dhcp3/dhcpd.conf' file...
ddns-update-style-none;
option domain-name "example.org";
default-lease-time 600;
max-lease-time 7200;
[Code]....
I have quadruple checked the mac address of the client and it is definitely "00:07:E9:32:16:81" so why is it not giving it the IP address that I have specified?
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Nov 29, 2010
I have a Debian VM on Windows that is not getting an IP address assigned by the DHCP. I tried, ifdown eth0 and then ifup eth0 and still no IP address. my interfaces file looks like this:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
[code]....
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Apr 27, 2011
I'm running gnome desktop on squeeze system. When I boot my system seems to be using my internet modem as its dhcp server. The rest of the machines on my lan are correctly using my router for that purpose. As a result, what happens then is that my debian machine frequently gets a duplicate ip address assigned to it. I would like to specify to my debian computer that I want it to use the specific fixed ip address of my router for dhcp purposes.
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Mar 25, 2010
I am puzzled with trying to configure a linux (openSUSE) client to dhcp to eBox DHCP server. I am using dhclient to lease an IP address with dhclient eth0 -s 10.45.48.108 and get a response
openSUSE11232CL1 dhclient: DHCPDISCOVER on eth0 to 10.45.48.108 port 67 interval 4
openSUSE11232CL1 dhclient: DHCPOFFER from 10.45.48.108
openSUSE11232CL1 dhclient: DHCPREQUEST on eth0 to 10.45.48.108 port 67
openSUSE11232CL1 dhclient: send_packet: Network is unreachable
openSUSE11232CL1 dhclient: send_packet: please consult README file regarding broadcast address.
The server reports eBox141 dhcpd: DHCPDISCOVER from 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
eBox141 dhcpd: DHCPOFFER on 10.45.200.2 to 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
I interpret this as the server receives the request and the client accepting it but the lease does not last long and the connection breaks. what this could be and why the connection breaks? Or my undestanding is totally wrong on how it works and should work? And BTW, where is that README file that's referenced in the message I receive on the client?
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Mar 3, 2010
This one has been bugging me for some time now. The network interface (as defined in Debian's /etc/network/interfaces file) fails to obtain an IP address from myuter. However dhclient br0 does.I'm using br0 since I run a XP virtual machine.network/interface changes are from a Debian howto on setting up the tap interface.As near as I can tell, the /etc/init.d/networking script basically calls /sbin/ifup -a. ifup is a binary.My /etc/network/interfaces file is:
auto lo
iface lo inet loopback
address 127.0.0.1
[code]...
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Dec 11, 2014
I am create Xen virtual machines.
I created a domu.cfg file with:
xen-create-nfs --ip 192.168.13.2 --broadcast 192.168.13.255 --gateway 192.168.13.1 --netmask 255.255.255.0 --nameserver 192.168.13.1 --initrd /boot/initrd.img-3.18.0 --kernel /boot/vmlinuz-3.18.0 --memory 4096M --mac 00:16:3e:01:01:01 --nfs_server myserver --nfs_root /var/exports/myhost --hostname myhost
I initialized it with:
xt-install-image --cache yes --dist wheezy --apt_proxy http://192.168.13.1:3142/ --mirror http://ftp.fr.debian.org/debian/ --location /var/exports/myhost
Then I started the domu with:
xl create /etc/xen/domu.cfg -c
And I receive this message telling me dhcp is used as I specified static ip:
IP-Config: eth0 hardware address 00:16:3e:01:01:01 mtu 1500 DHCP RARP
What can I do to desactivate the dhcp client?
remark: I used this equivalent former configuration with qemu-kvm and I booted with static ip without any problem.
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Apr 18, 2011
I setup the dnsmasq in debian squeeze as dhcp and dns server, for the debian host i assigned the static ip addresses, and configured the xp for dhcp. Windows XP network can't acquire DHCP address from debian squeeze with this error:
Quote:
error unable to contact your dhcp server Request has timed out.
this is the tcpdump output in debian for the xp network:
Quote:
15:12:10.631635 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:07:e9:a8:ea:93 (oui Unknown), length 300
15:13:16.611793 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:07:e9:a8:ea:93 (oui Unknown), length 300
15:13:16.611793 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:07:e9:a8:ea:93 (oui Unknown), length 300
15:12:42.631730 ARP, Request who-has 169.254.202.161 tell 169.254.202.161, length 4615:12:44.613568 ARP, Request who-has
[code]....
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May 29, 2014
I have 2 PCs, each running Oracle VirtualBox with about 30VMs installed and standing on the same table
On shopping router I found TP-Link
TL-WR741ND
150Mbps Wireless N Router
[URL] ....
How can it assign 30 IP address to each PC?
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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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Mar 15, 2011
I want to keet some data on windows dir. I have tried the below command and giving the below error.
[root@xyz0044 ~]# mount -t cifs //10.48.64.52/jata -o username=domainv.kumar3,password=xxxx /mnt/backup
mount: block device //10.48.64.52/jata is write-protected, mounting read-only
mount: cannot mount block device //10.48.64.52/jata read-only
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Mar 31, 2010
Details:
1. Using XP Pro SP3 (32-bit)
2. Laptop = Sony VAIO VGN-FZ140E
3. Recently purchased a TP-Link Router (TL-WR740N) which claims to give 150 Mbps speed
When connected, my Intel Wireless WiFi Link 4965AGN shows a speed of only 65 Mbps . A friend came over with his laptop (having Windows 7) and was able to get 150 Mbps speed. I even compared and the same web sites were opening with considerable difference on our laptops. Do I need to upgrade the driver?
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May 5, 2011
If I have a desktop with a USB wifi adapter connected to the internet through an ethernet cable, is it possible to create a wireless network using the adapter that will allow other users to connect to the internet through mine? I'm in a fairly low-tech place for the next few weeks and getting a router isn't likely.
If it's possible, anyone have links or instructions for how to do it?
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Apr 11, 2011
I am looking for an answer about how to allow just one trusted DHCP server and block others ?I am using Centos 5.5, iptables and dhclient.I have read that it is impossible to block DHCP Replay using iptables: URL...So how can I do that ? Maybe another dhcp client?
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Jul 6, 2010
My ISP provides my internet via DHCP. I have a home wireless router to provide internet access, wired for my desktop machine and wireless for my laptop. My question is: Is it possible to configure the router (the Access Point) to provide internet to the desktop and the laptop via static IP? Currently I have managed to configure the internet to them via DHCP and it works. I am just curious to know whether it is possible to provide the internet for them by static IPs, given that the internet that actually goes into the Access Point (the wireless home router), is DHCP.I fiddled with this a lot yesterday, but I only managed to get a working configuraton by DHCP for both the desktop and the laptop. If I supply them with static IPs, I can only ping the Access Point, but not beyond it. So does it at all make any sense to try to configure them by static IPs, i.e. is that virtually possible?
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Feb 15, 2011
I want to have a firewall that is connected to my modem and router and have it function as just a firewall no dhcp no routing is that possible?
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Sep 29, 2010
I installed PCLOS 2010.07 into my laptop and dual booting with windows vista. Now I got a weird problem that is when I connected linux to my wifi router, it cannot obtain IP! (it still work correctly in windows, problem just with linux) I had to manually set ip and that worked. Now i wonder what is happening, because I didn't see this problem with PCLOS 2009 borrowed from my friend few months ago.
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Aug 16, 2010
I am trying to set up a DUAL WAN Load balancer on linux. All i want is just the dual wan loadbalancing and nothing else not even the firewall service. Also what would be the ideal configration for that system
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Feb 5, 2011
how to block a specific MAC address
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May 25, 2010
how to block PC in Squid using Mac Address. I tried as in /etc/squid/squid. conf
acl block arp 00:13:45:d3: 24:e4
https_access deny block
but it give me error as like: - (This is the output of # squid -k parse) aclParseAclLine: Invalid ACL type 'arp' FATAL: Bungled squid.conf line 1234: acl block arp 00:13:45:d3: 24:e4 squid Cache (Version 2.5.STABLE6) : Terminated abnormally
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Apr 13, 2011
I have a network with one of the server machine being under Fedora 14 and the clients machines being under Windows 7 and Fedora 14.
Quite often I get some difficulties for the clients to get an IP address from the dhcp server. If I look at the server logs, it looks like the server sees the requests and sends and answer:
Apr 12 19:33:18 dhcpd: DHCPDISCOVER from 00:21:70:c5:22:4e via eth1
Apr 12 19:33:18 dhcpd: DHCPOFFER on 192.168.28.52 to 00:21:70:c5:22:4e via eth1
Apr 12 19:33:23 dhcpd: DHCPDISCOVER from 00:21:70:c5:22:4e via eth1
Apr 12 19:33:23 dhcpd: DHCPOFFER on 192.168.28.52 to 00:21:70:c5:22:4e via eth1
Apr 12 19:33:33 dhcpd: DHCPDISCOVER from 00:21:70:c5:22:4e via eth1
[Code].....
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Jun 3, 2010
I had 200 workstation with both Windows XP and SuSe Enterprise Linux. Sometime, a few clients can't get IP address from DHCP with SuSe OS. With the same computer, if I reboot and chose Windows XP, it work fine. The log message or the boot message was "No IP Address yet ...backgrounding". I tried to reconfig network device, restart services, change another port, change another line LAN, set static IP Address .... but there's no luck for me.
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Jan 13, 2011
Is there a way to configure DHCP IP Reservation thru MAC ? eg. {MAC ADDRESS} 192.168.1.23 So, when somebody owns this MAC address leases IP, it will give the one in reservation. Also, for security in mind, DHCP will ONLY lease IP if its MAC address is listed, otherwise, DHCP will NOT give IP.
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Aug 12, 2010
I had installed Ubuntu 10 to my desktop computer & I want to make it as DHCP server with Router, and use it for testing. I had installed dhcp server (apt-get install dhcp3-server) what should I do further? What file to edit?Also , I had 2 network cards, so I had to assign correctly the IPs & interfaces.
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Jul 27, 2011
I recently set up a web server at home, using a non-standard port, due to my ISP blocking 80. I just checked my log files, and I see a TON of entries indicating that a file was not found "proxy-1.php", "proxyheader.php", etc. I do not have these files, not intend to have them as part of my website. I did a whois looking by IP address for several of these, and they all seem to come from an ISP in China. Is there a way to BLOCK any IP address outside the US (that is somewhat simple to do?)
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Mar 25, 2010
how to block any IP address who failed to connect more than 3 ssh?
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Apr 9, 2010
I've just installed opensuse 11.2 with the network installation iso. During the installation, it has got the IP via DHCP without any problem, and I has downloaded all the needed packets without problems... But when the installation finish.I have no network connection It's strange, because I have IP address, I get the IP from the DHCP server, and I can see the IP addreess if I do "ifconfig", the default route and even the DNS servers in the resolv.conf file; but I cannot ping my gateway (that is the DHCP server as well!!), I cannot ping anything in my network and either anything in internet. I see a network error at the start, but it finally gets the ip address. In the dmesg, the last message repeats over and over. The machine is a Hyper-V virtual machine, but as I said... I worked very well during the installation, I don't know what is going on. I've tried to reinstall, but it doesn't make any difference
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