Networking :: DHCP Works But The Service Keeps Stopping Every Few Hours?

Feb 2, 2010

Ubuntu 9.10 2.6.31-17-generic
ISC DHCPd version 3.1.2

The DHCP service starts fine on boot and with manual start then works fine for about 4-5 hours. After that it just stops on its own. I start the service up and everything works fine for about 4-5 more hours untul it stops again.

What do I need to do to ensure that the service will stay uo 24x7x365?

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Networking :: NIC Bonding Works With Dhcp?

Dec 15, 2010

I want to bond two NIC to the same IP, I was able to do this for Static IP but not DHCP.
Does anyone have any idea about the possibility of this?

The process at which i reached to this question is explained here:
http://ubuntuforums.org/showthread.php?t=1645440

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Apr 5, 2010

I want to disable the irqbalance service.how i can do this? i given the below command from prompt,but it is showing failed.

i have fedora core10.

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Yes, another newbie question. Just loaded and updated FC 10. Everything works great with dhcp. Tried to setup static ip to learn more about how to set it up and nothing seems to work. I'm connected to DSL via a router when I ifconfig I get:(basic stuff)inet addr: 192.168.1.7 Bcast: 192.168.1.255 Mask: 255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

I have also tried default gateway 192.168.1.255 and 192.168.1.254.Most of what I have tried above has come from linux websites and faq's.Keeping in mind I am worst than any new newbie you have ever worked with

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Fedora Networking :: Static DHCP Works On All Computers

Oct 18, 2009

I'm pulling my hair out to figure out what's gone wrong. I have a small home network with a router and 4 computers, 3 linux boxes and 1 windoze machine.The windoze machine and 2 of the linux boxes (newer ones, one with FC11 and the other with Ubuntu Hardy) are using the router's "Set Static IP" option just fine. However an older FC5 machine I have always gets its IP assigned randomly. As this is the machine I ssh into from overseas via a Dynamic DNS, this is a huge frustration when the power goes off or I need to restart the machine. It's usually 192.168.0.2 but sometimes 192.168.0.3 and occasionally other numbers as well. It _should_ be 192.168.0.130. As near as I can tell, I'm doing everything the same between the machines. The router config is very simple and works for the other systems so I suspect I may have a legacy tweak that I did years ago that's causing the problem.

Anyone know what I can try? I'm afraid I'm not a networking guru (ahem, wouldn't be posting if I were!) so things like "check the this" will be more helpful if there's a clear example. "Check the this...emacs /etc/thisfile/config" and see if XYZ option is TRUE" is far more useful. Again, many thanks. If none of the systems were working right then it would be totally different...but 3 seem to work just fine and happily get their assigned static IPs. It's the one non-conformist that's the trouble...

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Client is running Oracle VM Server 2.2.1 (kernel 2.6.18-128.2.1.4.37.el5xen). Storage is a NetApp 3210 (NFS configured to use TCP). Iptables on client has udp and tcp ports 111, 2049 and the NFS server ports opened. Info retrieved using: rpcinfo -p NetApp When trying a manual mount.

[Code]....

stopping iptables also works (I can manually mount the share without using proto=tcp). Is the mounting process somehow trying to negotiate first using udp which the Netapp doesn't respond and hence it fails by timing out? Can I configure iptables such that I don't have to use the proto=tcp option? Or is there another configuration file I can tweak so that I don't have to use the proto=tcp option?

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Debian Configuration :: No Net After Changing DHCP Server Other OS Works?

Dec 15, 2010

I just put a pfSense firewall inbetween my ADSL router and my LAN. It's configured to have a cachng DNS server and a DHCP server. Among other things. For reasons beyond this post the address range served by DHCP changed from 10.0.0.x to 192.168.1.x. The new DHCP server gives 192.168.1.1 as gateway and DNS server name and not the public IP addresses of our internet provider.

After reconnecting our client machines everything worked just fine on the win-xp boxes, but the Debian Squeeze servers and Ubuntu 10.4 clients all started to get network timeouts. If I ping public websites it works but browsing to the same servers fails. Other services like POP3 and IMAP also fails. All machines use WiFi to connect and the access point is the same as before.

What could it be that make the debian boxes fail? My laptop runs squeeze too and also fails. But when connecting to various other access points at hotels and such I do not get this problem.

Another weird thing is that the debian server running virtualbox cannot do things online but the virtual windows boxes running on this machine can. Weird! Where should I start looking? How is networking/dhcp clients on Debian different from Windows XP?

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Ubuntu Networking :: DHCP Server No Longer Responses To DHCP Requests - Can't Ping Gateway

Oct 22, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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Jul 1, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.

When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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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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Currently I have my eth0 interface getting a DHCP address but at times the DHCP server will not be reachable. Sooo what I would like my server to do is if it cannot find a DHCP server assign a static address to eth0. Then start the DHCP service so it can then dish out some addresses.How can I do this? Surely it is possible

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I have attached an image of the syslog entry, which shows the problem lies with soffice.bin and names something called segfault.

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If I then issue the same ifup command again a second time, it successfully receives a DHCP offer from the router and receives the needed IP address, and after this, the Internet connection on the box works fine. It is consistently doing this everytime. Why is it failing to obtain a lease the first time?

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Is there a way to do this via the command line?

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Mar 25, 2010

how do I stop my Kubuntu to set up an IP ? I tried this:

sudo ifconfig eth0 192.168.0.1

but in the following minutes it changes it!how do I stop it?

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Sep 25, 2010

Periodically, about 3 to 5 hours, Ubuntu disconnects from my wi-fi network and doesn't reconnect until I restart the router.This is an Ubuntu specific issue, since it doesn't happen when I boot into my Windows partition, and it doesn't happen to other computers on the network.

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Machine setup
Intel 3.3GHz i5 core
4 gig RAM
GeForce GT 220

[code].....

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Jan 15, 2010

We have a NAS application which can be accessed by both HTTP and HTTPS connections.

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The converse has also been observed where the tcpserver for HTTPS is dead but tcpserver for HTTP is running.

The version of tcpserver that we are using here is ucspi-tcp-0.88.tar.gz.

I have the following queries:

a)Has anyone faced the same problem before?

b)Is it an issue with this package version of tcpserver ?

c)Will upgrading to newer versions of tcpserver bail me out of the issue?

d)Also, could anyone let me know what are the possible causes for the tcpserver to die ?

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Jul 31, 2010

I have a problem with network on centos, after i restart the server it works for few hours/couple days, and the network is dropped. - no errors in the log, only that "Network is unreachable" I do 'service network restart' comes back on- directadmin, dns, awbs- everything works good, but only for few hours(never longer then couple days), and then it is dropped again. I searched many forums, and on one them someone wrote that it is because that static IP was used on the same network by other machine. I had a different server running with that ip on my network before, but it was few weeks ago, and there is no other server connected to the network right now (I have one desktop connected with dynamic ip, and it has no problem), and i still have the same problem.

I was suggested to set a cron jobs to restart network every few hours- i thing that is not a solution. Does anyone have any idea what could be a problem? Anyone had similar problems? What could be the reasons for the network to be dropped after few hours? Here is latest 'dmesg' output after losing network:

[root@server ~]# dmesg
Linux version 2.6.18-194.8.1.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Thu Jul 1 19:04:48 EDT 2010
Command line: ro root=LABEL=/ rhgb quiet
BIOS-provided physical RAM map:

[Code]...

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Oct 2, 2010

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Jul 28, 2011

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I've tried iwpriv but it says there are no ioctls for the device.

Is there any way to get the installed driver rt2870sta to scan and connect to channel 13?

I've also tried to install the latest drivers from the ralink website: rt2870sta says it can see all 14 channels, but fails to scan. I also tried rt3070 driver but I cannot insmod as there are errors...

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Jul 20, 2010

do not post such long blocks of messages directly on the forums. Attach the output as .txt or use a pasetebin.

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