Ubuntu Networking :: Pxe Booting - Server Does Not Respond To Arp
Jan 21, 2010
I am trying to get a server to boot off the lan (pxe). I added a tftp server and tested it as operating successfully. I just plugged the pxe-server in and see the dhcp request/response as expected. The pxe-server then sends out an arp to the same address as the dhcp exchange, but the server never responds.
1. as the pxe-server already has info on the mac/ip-addr, why is it now sending another arp
2. why doesn't the server respond? I have most of my network setup the same way and the dhcp exchange is fine.
3. I'm guessing that the arp is triggered by the bootp exchange (next-server).
I do not have the server in the host table under that address.
127.0.0.1 localhost
127.0.1.1 ubuntu-desktop
192.168.5.101 windows1
Do I need to add 192.168.5.120 with a name to get arp to respond?
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Jan 9, 2011
I got a CentOS server setup as a dhcp server using dnsmasq. I followed this guide more or less: [URL] So, the problem seems to be concerning the DNS server on the clients. In windows I get the "limited connectivity" icon for the network, and when I select troubleshoot it says the DNS server does not respond. Issuing 'ipconfig /all' clearly shows the IP of the CentOS machine as the DNS server, which should be correct, yes?
ETH0 is working as WAN connection and that works great.. no problem with the WAN connection at all on the CentOS machine. ETH1 has the IP 192.168.0.1 and mask 255.255.255.0 When starting eth1, it sometimes says that it can't start eth1 because the IP 192.168.0.1 is already in use.. but that is most certainly not the case. Maybe there's some kind of issue here that messes with the DNS? What's mind boggling is that it works great on a linux machine (dhcp client) and on a windows xp machine. but it does not work on the windows 7 laptop and a vista laptop and a pda device.
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Mar 1, 2011
I have a CentOS 5 Server running for private fun... Just for playing with it and learn a little linux.this server has to Network interface cards. one for connecting from extern and one from connecting from the LAN.when i want to connect from lan (eg via SSH) this allways works!when i want to connect not from LAN this only works sometimes! only if i establish at the same time a connection from LAN it wors mostly.with other devices i have no problem (tested another server with just 1 NIC) and this works too.also the problem is not dyndns because i have the same problem when i try to connect through the direct IP.
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Apr 16, 2010
I recently set up a new web/file server with 9.10 server x64 with 2 NICs and I am trying to configure eth0 to respond to my LAN for internal samba filesharing and eth1 to handle website/ftp requests on my static IP, but whenever eth0 is up the server is not accessible at 173.XX.165.65 for web or ftp but both work fine at 10.1.10.100. When eth0 is down, public IP works fine. I have set /etc/network/interfaces like this:
Code:
# The primary network interface
auto eth0
iface eth0 inet static
address 10.1.10.100
[Code].....
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Jul 4, 2011
I have two servers, both running Ubuntu 11.04 Server. One is a web server, running only a LAMP stack and openssh-server. The other is running server daemons for TeamSpeak and Minecraft. Today, the game server just went down. I can access the LAN by using SSH to connect to the web server, and ping it from there. However, it won't respond to SSH or anything else. The server is a few kilometers from here, so I will be going there tomorrow.
This happened once before, probably about a month ago or something. That time, the web server was running just fine, but the game server was powered off. I thought there had been a power disruption, because when I checked the BIOS settings of the game server, it wasn't set to resume after AC power loss. The web server was set to do this, so it made sense that it would be up and running again after a brief power loss. There were also some news reports about power disruptions in my area.
The thing is, I changed the BIOS settings of the game server to make sure this wouldn't happen again. When I go there tomorrow, I will bring the server back up. However, I would like to know what caused this so that I may prevent it from occurring again. Is there a logfile or something that I can check tomorrow to find the problem?
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Sep 11, 2010
I need to create a network boot from 1 laptop to another, with a crossover ethernet cable between them, no routers no nothing, my computer is supposed to be the server. I followed half dozen tutorials over the internet but I think my major problem is with the dhcp serverfollowed this tutorial[URL]but when the client boots it makes several dhcp requests but doesn't respondwireshark capture looks something like this until the client times out
Code:
1 0.000000000 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0x200d8ad
[code].....
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Apr 29, 2010
I have Centos 5.4 installed on my server. Everything works perfect, however sometimes apache does not work properly. When I write my domain to browser it tries to reach the site, however it can't get any result. (There is no "browser couldn't find" error). The browser just tries to get the content.
When I login to my server with ssh using my domain name, there is no problem. (Named works.) When I give the "service httpd restart" command the problem disappears.I looked at httpd log files but there wasn't any problem at that time.I use the API's of the Facebook and Twitter, so there are many Curl requests are made with PHP. Could that be the reason?
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Jan 15, 2011
opensuse v11.3 I enabled a NFS server on a host, set up a couple of exports, opened the ports in the firewall. When I open the NFS Client on another host and select "Choose", there is popup that states "Scanning for hosts on this LAN...". Then it returns an error "No NFS server found on your network. ..." That's funny because I had previously mounted the two exported directories already by entering the server name manually. How do I get the NFS server to respond to an automated search?
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Mar 16, 2010
I have two dhcp server (dhcp3) in the same network, this network is a link layer network so every host is seen as directly connected. The two servers have debian lenny and there are near 13 AP mikrotik to give connection to the XO laptops (from the project one laptop per child). This is for two public schools (each one with one server) that are connected via a p2p connection and each one provides internet for the school and outdoor too. The servers are also file servers, proxy, etc.
Each time a laptop asks for an IP, it sends a broadcast message and this petition gets to both servers, now a days the first server that reply is the one the laptop associate with. What I want to do is, knowing the bandwith use of the ADSL, the clients connected to the server, and the cost to the AP that the laptop associate with, decide wich is the best server to be connected to. What I want to achive is to balance the load and to decide the optimum connection, because now it could happen that one server is very loaded and the other is free. I tried to run dhcp with inetd and use tcp wrappers to invoke a script to check a condition before responding and, in case to be the best server, reply to the laptop, but i couldn't get the dhcp server to respond when I run it with inetd. here is my inetd.conf
bootps dgram udp wait root /usr/sbin/tcpd dhcpd3
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May 18, 2010
There is this server running squid and dansguardian as proxy for the local network. Everything is working fine. But I have seen that from time to time the danguardian dies out and fails to respond to shutdown or restart commands. And this is because of the binary located at /usr/local/sbin named dansguardian goes empty. There are multiple instances and hence copying another named dansguardian.2 to dansguardian does it. And dansguardian works normally as it should. Looked into dmesg and /var/log/messages but nothing there. It was compiled and not installed from pre compiled binaries. And runs on CentOS5.4 Final.
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Oct 25, 2010
I wanted to install Samba for file-sharing purposes on my home network, so I went ahead and installed the latest stable Samba release, but it doesn't respond to commands in terminal (i.e. sudo samba start, sudo samba stop, sudo samba restart, sudo samba /etc/init.d/samba restart...). My shared files are now viewable on other computers but completely unusable for file storage. Samba DID respond when I was using Samba4, but when I used Samba 4 I got this:
Code:
matthew@Server:~$ samba restart
Unknown parameter encountered: "max log size"
Ignoring unknown parameter "max log size"
Unknown parameter encountered: "syslog"
Ignoring unknown parameter "syslog"
Unknown parameter encountered: "passdb backend"
Ignoring unknown parameter "passdb backend"
Unknown parameter encountered: "unix password sync"
Ignoring unknown parameter "unix password sync" .....
So I either get a Samba that doesn't work at all (the current version), or a Samba that pretends to work but ignores all of my parameters, claiming that it doesn't recognize any of them. I searched through synaptic package manager to make sure I have every single code or management file that could possibly be helpful for using Samba.
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Nov 16, 2010
I have CentOS 5.5 x86_64 with Apache, php and mysql.
I have just installed OTRS (helpdesk - trouble ticket system) on that server and no users.
This system works with perl, apache and mysql.
I notice that is slow to respond and at times unresponsive the apache welcome page. code...
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Apr 7, 2010
I have a server with centos 5 and plesk 9 and I have buy an additional IP address for my server, when i create it in plesk, there is no problem, all its ok I can assign it to a new domain, but the ip only responds ping, none of other services as http, ssh or smtp.I paste here the configuration of files
ifcfg-eth0
device=eth0
bootproto=dhcp
[code]....
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Jan 7, 2011
I have recently make a website. When I enter to it by http://localhost it works fine, but when I enter by my IP, nothing apears. Firefox told me that the server takes too long to respond.
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Aug 11, 2009
I cannot get either sendmail or postfix to send a 220 response, nor respond with details. See below for sample telnet output. Details: I have a server that requires email, but only for light use. I'm definitely not an expert, but I have set up a sendmail configuration on a previous server. I tried to configure sendmail first and then postfix later, when I couldn't get sendmail working. I'm not sure exactly what the problem is, but I have a feeling the following might yield some important information. Note: this is the result for Postfix, but virtually the same thing happened with sendmail, too. That is, initially the telnet connection would close immediately. Afterwords, I could connect a second time but then it never responded with a 220 banner nor any 250's.
[Code]...
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Oct 5, 2010
i'm experiencing some weird behaviour: I have a server running ubuntu 10.04 and two Apple laptops in my home network. Sometimes after booting up the server doesn't connect to the wireless network, but instead "kills" the connection of the laptops. (The network then isn't available for about two minutes - it's showing but it can't connect) On the server the network interface is up, but not associated.
Sometimes the interface isn't configured properly (iwconfig isn't showing an entry) - but in this case the behaviour obviously isn't showing. some information about my system:
Ubuntu Version: Server 10.04x64
Wireless Card: Netgear WG311v3 with marvell chipset
Driver: ndiswrapper+mrv8335x64
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Oct 7, 2009
I have a problem on my LAN, then: I have a laptop on which Windows Vista is installed, and every time I try to do ping to my server centos, my centos server does not respond to ping. The server is operating normally, because I found other PCs on my network that communicate normally with my centos server.
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Oct 11, 2010
I recently setup a new Linux server running Fedora 10. For some reason all ping response times are rounded to the nearest 10ms. For example, running the simple command "ping yahoo.com" give the following sample results:
64 bytes from ir1.fp.vip.re1.yahoo.com (69.147.125.65): icmp_seq=12 ttl=57 time=60.0 ms
64 bytes from ir1.fp.vip.re1.yahoo.com (69.147.125.65): icmp_seq=13 ttl=56 time=50.0 ms
64 bytes from ir1.fp.vip.re1.yahoo.com (69.147.125.65): icmp_seq=14 ttl=56 time=40.0 ms
64 bytes from ir1.fp.vip.re1.yahoo.com (69.147.125.65): icmp_seq=15 ttl=56 time=50.0 ms
I could post a larger result set but its all the same... every response is rounded to a multiple of 10ms. This wouldn't be a big deal except that the server is running Nagios for monitoring so accurate stats are important. The Nagios check_ping and check_icmp commands are also returning rounded off results. How can I get ping to simply respond with the actual response times rather than a rounded off number?
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Dec 22, 2010
I recently added a second interface to my Ubuntu 9.10 server, I now have a dsl AND Cable connection for it, Im not trying to load balance or anything sophisitcated, heres my problem.
The machines networked, I put static entries in my dhcp servers and both interfaces are up and live with dhcp, and Ive tried with dhcp and static, same problem occurs.
But my problem is that services will only respond on one interface at a time, not both.
Anyone know what the heck is going on here?
Kernel IP routing table
Should I make them static and remove both gateways?
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Jan 20, 2011
I have a Slackware 13.0 server that is not replying to icmp pings. However, I have double checked that /proc/sys/net/ipv4/icmp_echo_ignore_all is set to 0. The weird thing is I can run nc -v slackware 22 from any computer on my lan and the banner comes up just fine. The nic is on the same netmask and broadcast as all the other computers on my lan. I can log into it as well, it just doesn't respond to pings. I can even ping other computers and get replies just fine when pinging from inside the Slackware server.
I have even added an iptables INPUT rule for -p icmp -j ACCEPT. Although I've never had to do this. I ran tcpdump -vv icmp and I can see ping requests coming into the computer, however slackware simply doesn't respond. What could be causing this? A corrupt arp cache? It's been happening for more than a few hours so I wouldn't think so. How can I view the arp cache table? How do I clear it?
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Feb 22, 2011
Perty self explanitory, I'm trying to boot up ubunto server edition 10.10 from a USB stick (pen drive) and it works fine until step 3 when it says "Your installation CD-ROM couldn't be mounted. This probably means that the CD-ROM was not put in the drive. If so you can insert it and try again
Try again to mount the CD-ROM? <Yes> <No>"
I don't have an installation cd-rom! I put the .iso file onto a memory stick, inserted it into my old computer (which i will turn into a server later) , restarted it and got past the first two slides and got this error? Do I have to put the iso on a cd-rom?
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Mar 27, 2010
I have been trying to accomplish this feat for about a week now, and I always seem to get a boot up error.
Here is how I call WinPe from my default file
Code:
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Feb 11, 2010
We have done an installation on a blade server (HP) for RHEL4.5.
The server have an HP smart array 2200 controller and during installation it can see the controller and disks just fine.
The installation completes up to the point where the system needs to reboot , however after the reboot it does not start up again and get stuck at the message: "Trying to boot from drive c:"
We used the rescue option to mount the installation and cant find nythign wrong, even with the grub setup (except that it points to hd96 as its primary disk). we tried changing this to hd0 as well but still no luck.
After about 3 installations we are still not having any luck.
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May 26, 2010
the Lucid Lynx - released in April 2010 I acedentally pull my scool folder into Trashï (i think the folder is 5 gb or omething.)i haven't empty my trash yet. But now i cant open trash, i press the Trash icon and then the window comes up, and then it does not respond?d to get in root but i cant get permissions. I have tried some ways in the terminal tget root permissions, i have password, but i still cant came inRoot
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Aug 8, 2010
I'm having some weird problems with my mouse and keyboard. I'll be moving the mouse and keyboard about and all of a sudden the keyboard won't respond and the mouse moves and is fully working, but it seems to be a problem with the desktop, more then the mouse, because it'll highlight stuff and certain stuff will open when I click them, but when I go down to the toolbar, and try to click applications, places, and system, it'll highlight it but not respond when I click it. This happens about every 45 Minutes, to 1 hour of time with ubuntu running [10.04] [Additional details]
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- My drivers are all up to date
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Sep 6, 2010
I've been scouring the message boards and trying different things for two days and haven't found a solution. I set up Ubuntu 10.04.1 a few days ago using the server iso and selected the LAMP installation option. I will be using it as a sandbox to try out things from a PHP/MySQL book I purchased.
I have installed Gnome since sometimes I just can't get the command prompt to let me do things and Gnome may at least tell me why. I also installed PHPMyadmin.
My problem is that I can work with this thing all I want in any way I want - HTTP, SSH, SFTP, etc. - from within my home network but Apache refuses to respond to an outside request. Since it's only a test box it usually wouldn't be that big of a deal but I am going out of town for a couple of days and would really like to start working with my new book.
I am 99% sure my ISP is not blocking any ports. I have a ComTrend ADSL modem with router. I have given my Apache server a static IP on the NAT (xxx.xxx.x.101) and set up a dyndns address so I don't have to keep remembering the IP address.
Here is what I have tried so far: Setup a virtual server (port forwarding) on the router to to direct traffic on port 80 to internal IP .101The router told me its interface is using 80 so it would move itself to 8080 Made sure to also add port trigger for port 80 Made sure to save/reset the router Used my iPhone to connect via 3G - didn't work using IP or dyndns name Used iPhone to connect to 8080 and router responded
Set port forwarding/triggering for 8080 -> 80. No joy there, either Tried changing listening port to 8000Set port forwarding and triggering to allow port 8000 Changed ports.conf to read NameVirtualHost *:8000 and Listen 8000 Changed first line of /etc/apache2/sites-enabled/000-default to <VirtualHost *:8000> Restarted Apache service
Apache responded to dyndns.com:8000 from home machine No response when trying same on iPhone (sorry, it's the easiest way for me to test from outside my home network)
At one point, I added "ServerName localhost" to the otherwise empty httpd.conf file but that didn't seem to do a darn thing.
Many of the posts I have perused are at least a couple of years old and have included information on taking action with files that are not there or are no longer where they were. I have interpolated where I can but so far nothing has worked.
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Jan 7, 2011
I just setup Ubuntu 10.04, and immediately installed OpenSSH using synaptic. I edited the /etc/ssh/sshd_config file e.g. no password authentication, non-standard port, etc. Using /etc/init.d/ssh restart I restarted the daemon, and everything worked perfectly. However, now it's almost like there is a lock on my service somehow. I edited the config file and added "PrintMotd no" and "Banner none". I killed all my active ssh sessions, restarted, and still saw the motd and the banner.
I then tried sudo /etc/init.d/ssh stop. The script reported ok, but netstat reported sshd as still listening on the port I had defined. I could still login. At this point, I don't know what else to do. I have tried looking at auth.log, I don't see anything funny there. I tried rebooting, and the config changes are (apparently) not loaded, I still see the motd upon ssh login. This is a totally clean system so I don't know what I am doing improperly.
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May 13, 2011
I'm running Xmonad and just recently it has stopped responding. None of my shortcuts are working at all. So I deleted my ~/.xmonad/xmoand.hs file, and still no luck. So I decided to log in as root and Xmonad works perfectly. Anyone know why Xmonad isn't working under my normal user? Is there a button i accidently pressed turning off the mod key?I was just browsing the web, then after I closed my browser nothing has been working, even after reboot.
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Jan 23, 2010
I've set up a ubuntu server 8.04 with ntp-server. At boot time the ntp service is started, butCode:ntpq -pdelivers:No association ID's returned.I've set up the ntp the way to be able above my private network to use this as reference.If i restart ntp everything is fine.First i thought that the problem is that dhcp is started after ntp, but after changing the start-order in the runlevels this enigma remains.
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Mar 10, 2011
this may seem a little odd, but I used my server to install Ubuntu on to an external hard drive. (long story short, the server won't recognize any internal hard disks with any type of video card installed. The video card works just fine when installed, and it will read both CDs/DVDs and USB drives just fine, it just refuses to even notice hard disks. I'm assuming an IRQ issue, but I've tried changing them with no success.) Having installed Ubuntu 10.04 on my external 250g hard disk, I attempted to boot it from the USB drive, since the system has that option. It tells me "error: out of disk" and goes to the Grub rescue prompt. Having followed multiple threads and advice posts, including on this forum, I was unable to resolve the issue. For s'n'gs, I hooked affore mentioned external hard disk to my laptop and tested it. Boots just fine. Then hooked it back to my server to see if it would boot. Still no dice [Just a side note, no the video card is not currently installed in said server, I was testing it to see if the thing would install and operate alright before I tested it with video card installed. Only ever make one change at a time, that way if something explodes, I know what caused it.] My initial objective was to get an operating system that would boot with the video card installed. Any ideas what might be going wrong here?
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