Ubuntu Networking :: Unable To Get Another Lease, Period
Nov 15, 2010
I've been trying to figure out a strange DHCP problem my girlfriend's having: She can only get (or renew) a DHCP lease once; Subsequent tries timeout. I tried switching from network-manager (which uses dhclient) to wicd (dhcpcd), and noticed a key difference: With wicd, restarting helps (again, works once, then another restart is required). With network-manager, I haven't been able to get another lease, period.
Exploring the dhcpcd case further, I found that suspend/hibernate do not correct the issue; a full restart is required. Neither does `/etc/init.d/wicd restart` help. I don't remember if I tried killing dhcpcd; I'll have to test that. The current workaround is to restart the computer after each disconnect. It's pretty annoying, though, so I'd like to try to collect enough specifics to file accurate bug reports for each dhcpcd and dhclient. Is anyone familiar with these projects? Are these known issues? Any ideas how to hone in a bit? My gut tells me there's some state somewhere that needs to get flushed.
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Feb 7, 2010
I have a home WiFi network that has been working fine for ages, which currently supports two Windows-based laptops and a WM5 smartphone. They all connect to the WiFi router (Linksys WRT54G) which in turn connects to the ADSL modem (Huawei MT882). The router is configured with a WEP key, the SSID is not being broadcast, and all MAC addresses must be whitelisted. I try to follow good wireless network security practice. I also have NAT running between the router and the modem.
Everything is working fine for the Windows clients, and now I am trying to add my Linux box to the mix. I am setting up an older HP Pavilion 510a desktop with Ubuntu v8.04LTS, using a Realtek RTL8185 WLAN card. The machine has an onboard RTL8139 LAN adaptor also, which works fine when I plug it in directly to an ethernet port on the wireless router. The WLAN, however, does not seem to be getting a DHCP packet, and keeps on autoconfiguring with a 169.254.x.x address. When I try giving it a static IP address it doesn't connect either.
As you can see from the screenshots below, the WLAN is working fine. I have it installed using the ndiswrapper and Windows drivers. I've been through the Comprehensive ndiswrapper troubleshooting guide but that did not resolve my problem.
I configured the network myself, and it works perfectly for my Windows machines. It is just my lack of experience with Linux which is preventing me from getting the wireless to work under Linux. I can get a HDCP packet in Linux when I am connected to the LAN using the RTL8139 adaptor, but not on the WLAN using the RTL8185 adaptor.
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Jun 5, 2010
I have a Zotac Ionitx A-U. I can't get it to establish an internet connection with the wired ethernet within Ubuntu. The chip is detected, but trying to bring up the connection stalls out at trying to obtain a DHCP lease, like this:
DHCP DISCOVER ...
DHCP DISCOVER ...
No DHCPOFFERS received
Specs:
Ionitx A-U
Ubuntu 10.04 x64 kernel 2.6.32-22 (also didn't work in 9.10)
[Code]...
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Jan 26, 2011
Is there any way to get an async notification (perhaps through something like a Linux message queue or Unix socket) when a DHCP client is either unable to renew its lease, or the address obtained changes from the previous value? I've got the ISC client and will dig into it to determine if it supports such a feature, but thought I'd ask here in parallel. (I'm trying to find out if there are any DHCP clients out there which already support this capability.)
If you're curious: We have an application where we're doing auto-registration of an IP camera to an external server. If the camera's dynamically assigned address changes, we need to restart the auto-reg state machine. I've seen implementations where a socket is opened and a SIOCGIFADDR ioctl used to fetch the IP addr, but I'd sure like to avoid polling like this if possible.
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Apr 23, 2010
We have 20+ Redhat servers on our network and every so often our DHCP server goes down. When it comes back up we have to go around to all of our RedHat servers and restart networking manually. Other OS's (Ubuntu, Windows, etc..) will continually try to get a DHCP lease so that when our DHCP does come back up it requires no work from us for them to get back on the network. But it seems that Redhat only tries once and if it fails it never tries again. Have to go around to 20 different servers (some of them are at remote locations) is less then ideal when this happens. how we can get Redhat to continually try to get a DHCP lease like other OS's?
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Mar 3, 2011
The system I am working on is a xdsl board running Linux kernel 2.6 and receiving dhcp address from a Microsoft XP PC. when looking through the dhclient.leases file I can see there's something wrong with renew time and stuff.strange calculation. as far as you know is this normal? You may find below the dhclient.lease file.
lease {
interface "tap0";
fixed-address 10.0.1.16;
filename "***";
medium "-link0 -link1 -link2";
[code]....
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Jun 22, 2011
I got a strange issue here: We are using ISC DHCP v4 which is default in Open SuSE 11.4. These two options 'default-lease-time' and 'max-lease-time' are set in all subnets, with values between 43200 (12 hours) to 518400 (144 hours). See partial dhcpd.conf below please.Now the lease time from Windows client's ipconfig output is only 10 minutes. Why? (dhcpd on servers restarted many times. ipconfig /release, ipconfig /renew on client run many times)
Code:
lease-file-name "/etc/dhcpd.leases";
default-lease-time 43200; # 12 hours
[code]....
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May 26, 2010
I've set up a permanent DHCP lease for my MAC address. I did this hoping to resolve the fact that I share my Internet ADSL connection with my wife and my daughter (the latter a great bandwidth hog)!
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Jan 11, 2011
I installed linux 2010 mandriva on a (embeded) system,and i run several server programs on it that accept connections from clients. clients are connected to server(s) and every things is ok, but when i go to home and back to my work tomorrow, i see no data can be sent to server programs and this problem exists until i restart the server programs or reconnect tcp client programs. this problem occurs even when both client and server programs executed on the same (embeded) system.why this happens? i checked by netstat and see that server ports exists in the list(and not closed by kernel) but it seems kernel or an application above it prohibit data transmission.i changed the OS and installed ubuntu but the problem exists.
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Aug 1, 2010
I'm running an up-to-date Fedora 12 machine with the Gnome desktop (meaning with Network Manager). My network connection is a wired ethernet to a switch which then connects to a Netgear router. For some reason, this machine can't renew its leases with DHCP, so NetworkManager deactivates eth0, taking my machine off the network. I have to click Network Manager and enable eth0, which seems to work every time.
How can I fix it? Here are the relevant bits from /var/log/messages showing a failed DHCP request and then the successful renewal.
Code:
Aug 1 04:00:08 ironton dhclient[12452]: DHCPREQUEST on eth0 to 192.168.1.1 port 67
Aug 1 04:00:08 ironton dhclient[12452]: DHCPNAK from 192.168.1.1
Aug 1 04:00:08 ironton NetworkManager[1261]: <info> (eth0): DHCPv4 state changed reboot -> expire
Aug 1 04:00:08 ironton NetworkManager[1261]: <info> (eth0): device state change: 8 -> 9 (reason 6)
Aug 1 04:00:08 ironton NetworkManager[1261]: <info> Marking connection 'System eth0' invalid because IP configuration expired.
[Code]...
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Jan 15, 2011
At present I have to live with a 5Gb/month data volume limitation. Due to having to monitor this usage, I have been forced to use the software that came with the web dongle - and that means having to use Windows (spit!)
Can anyone recommend a Linux package I could download that readily shows how much data one has uploaded/downloaded over a set period?
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Nov 24, 2009
I'm running Fedora 12 on an Acer Aspire One with KDE. The built-in wireless works without a problem EVERYWHERE except at work. It's a shared wireless connection using WPA/WPA2 security.I can connect but it's "hit-and-miss" if I can do anything with it. Somedays it works well for a few minutes then has a period of inactivity - then slow - randomly receives...It worked flawlessly when the computer was running Windows7 no one else has connectivity issues but I'm the only one using Linux.
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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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May 9, 2011
I would like to be able to schedule a limit for an IP connection for my kid's computers/iPods. Since I know the MAC addresses of their various hardware items, is there a way to shut down their connectivity at a particular time via the DHCP server or perhaps a firewall rule?
Running Ubuntu 10.04 and Shorewall is being used for the firewall.
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May 10, 2011
I've a question about how work dhcpd. I'm on CentOS 5.6. I has a dhcpd server on it. His configuration:
authoritative;
ddns-update-style none;
deny declines;
deny bootp;
option domain-name "mydomain.domain";
option domain-name-servers IP;
option routers IP;
option time-offset -18000;
#option ntp-servers IP;
subnet IP netmask MASK {
range IP START IP END ;
default-lease-time 86400;
max-lease-time 172800; }
And now in the /var/lib/dhcpd/dhcpd.lease file, there few entrie for the same IP. Sometime I've ten same entries for the same IP. Can I have only one entrie by IP? Is there any problems in my configuration of my dhcpd.conf file?
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May 4, 2011
iam running dnsmasq on my target board , my dnsmasq.conf has following configurations
# cat /var/etc/dnsmasq.conf
strict-order
localise-queries
[code]....
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Mar 28, 2010
Looking at var/log/messages below, it looks like I'm not being offered a lease on this particular network. I can successfully connect to the network because iwconfig wlan0 reveals my network ssid and the access point I'm connected to. But pinging google.com gives me nothing..
Code:
root@darkstar:/# tail -f var/log/messages | grep dhcpcd
Mar 28 15:45:42 darkstar dhcpcd[5329]: wlan0: adding IP address 169.254.76.182/16
Mar 28 15:46:13 darkstar dhcpcd[5329]: wlan0: adding IP address 169.254.76.182/16
Mar 28 15:46:44 darkstar dhcpcd[5329]: wlan0: adding IP address 169.254.76.182/16
[code]...
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Oct 13, 2010
this is rather odd actually and has never happened to be before.I recently installed slackware in a toshiba satellite m40 185 laptop and during boot it doesn't get an ip address from the server. the boot messages are of the sort:
dhcpcd: v5.2.2 started
dhcpcd: waiting for carrier
dhcpcd: timed out
[code]....
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Jul 13, 2011
I have a dhcpd server running CentOS and Webmin. I noticed in my lists of expired leases some of the lease times are only a few hours even thought I have lease length set to 1 week. I want to keep a lease for a week even if the device requests that it be expired. Is there some way I can do this in dhcpd? I am attaching a screenshot of some of my lease times listed in Webmin.
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Jun 7, 2011
I have a file like this code...
I would like to use sed or similar to remove everything before the period, but only for the lines 1 and 3 (or lines with a-z.a-z and not a-z = 0-9.0-9.0-9.0-9)
I found a way to do this using:
cat $file | sed 's/[.].*//'
But this 1)remove all the text AFTER the period and not before it, and 2) removes everything after the first decimal of the IP address.
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Jul 16, 2010
I'm having some problems bringing up my wireless card at boot time on my Red Hat Linux 9.0 box. After some investigation with the boot scripts, I noticed that it was having problems with the DHCP negotiations when the ifup wlan0 command is issued.I then tested the command outside of the booting process and everytime the command is issued the first time, the dhclient fails to get any DHCP offers and returns with the message Unable to obtain a lease on first try. Exiting. and then exits.
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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Sep 2, 2010
Ubuntu 10.04.1 LTS: It appears that run-parts does not run scripts with a period in the name. I had a script upg.sh which run-parts did not recognise; when I changed it to upg it did. This is surely a bug!
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Dec 16, 2010
I installed ubuntu 10.0.4 TLS version and my desktop freezes after a period of inactive time: the screen doesn't change and the apps do not response. It will resume after any key-stroke or mouse action. Is it a feature of 'power-saving' or something else? I need my ubuntu keep 'alive' all the time.
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Jun 29, 2011
Please help me to resolve th problem stated underneath:My computer(P4, 512MB RAM) running Ubuntu 10.04 hangs unexpectedly after certain period of inactivity (4-5 minutes maybe). I checked power management settings and all power saving options are set to off.The screen says Checking battery state comes for a while... and then black screen with stripes comes. Monitor also goes off for say a sec or two.Then monitor goes 'on' on its own .This process of Black screen with stripes, monitor off and on goes on until I "Reboot"
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Nov 30, 2010
How do i configure my KDE in openSuse11.3 so that the user is automatically logged out if no ones on the machine for a certain period of time?
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Dec 13, 2010
Between the dates 21-June-2007 to 12-December-2010 there are 1270 days. If the total cumulative time a hard drive has been active is 344 days (found this via Disk Utility in Ubuntu 10.10) since it was bought 1270 days ago. What is the average usage hours per day?
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Mar 16, 2011
Now i am writting one bash script. in that my requirement is i need to create one directory and that the directory details to be stored in one file Ex. date/time and all in one file. after that i need to delete the folder automatically exactly after 3months. between these time period in 2month itself i need to send one mail to admin "regarding this still one month only more to delete the folder" . is it possible to do like that date calculation in script.
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Jul 1, 2010
How i can know processor utilization during peak period in rhel 5.3.
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May 18, 2010
Like the following c++ program, I define a pointer of char type in the class named "test". In the function init1(), str="hello1" , what is the existing period of "hello1". Whether the string "hello1" will be invalid if the function init1() exits ? then "str" point to the invalid field in memory. When will "hello1" and "hello2" be released by OS ?
Where is "hello1" stored in memory?
Code:
When will "hello everyone" be released?
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Jan 21, 2010
I skipped over Jaunty on my main desktop because Intrepid had been working perfectly for so long. Finally took the plunge to Karmic, and have had major instability problems. I cannot trace them to any particular program I am using. At first it seemed related to power management, since it would lock up every time it had a period of extended inactivity. I have disabled ACPI in my BIOS (I think), and any power management settings I could find in gnome to try to troubleshoot. That seems to have helped, but it still happens semi-regularly, sometimes when I am in the middle of using it. I have tried checking logs and googled anything that seemed important. ie a message in kern.log reads: Clocksource tsc unstable
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