Ubuntu Networking :: OpenDNS - 8.04 Machine Do Not Always Resolve Internet Address
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".
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
Centos 5, After switching out server to another provider the website responds as it should but the server is unable to establish connections to remote servers. Yes the internet connection is fine, I'm actually working on the server remotely.
--- 4.2.2.2 ping statistics --- 4 packets transmitted, 0 received, 100% packet loss, time 2999ms /etc/resolv.conf has opendns nameservers nameserver 208.67.222.222 nameserver 208.67.220.220 search localdomain and I've updated /etc/sysconfig/network to reflect the new IP address.
Anyway, my internet has been working fine until recently (last week or so). For most sites, Firefox will load the page quickly. However, every once in a while, but frequently enough to annoying, it will say "loading" for 10 seconds, then direct me to OpenDNS, which says the page cannot load. When I try it again, I get the same problem. Other sites are fine.
Then, when I quit Firefox and restart it, that site will work fine, but soon enough, another site stops loading properly.
For example, Google will work fine for awhile, then I'll get the error, but after restarting, Google will be fine again, but now Wikipedia, which loaded before, gets the error. And the cycle continues on yet another website...
I haven't changed any Internet or network settings recently. I'm on Ubuntu 10.04.
I have to build a netwrok for small lab and office setup.Setup as belowI have a PC running with Centos 5.4 and has 4 NIC cards. eth0, eth1, eth2 and eth3
I just changed my CentOS server from DHCP to static IP address. After the change, I cannot ping other hosts on the same subnet. (I can ping the CentOS itself).The IP address of CentOS is 192.168.0.202.After pinging 192.168.0.106 (106 is on and other host can ping it), arp -a shows? (192.168.0.106) at <incomplete> on eth0 It looks ARP cannot resolve MAC address of hosts 192.168.0.106.
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.
Here is a glimpse of my IPTABLES http://pastebin.com/WvHAC46A I see in the column of sources the addresses being resolved to domain names is there a way I can stop this?
I have an ubuntu kk laptop connected via wireless to my mixed network (xp, win7, other ubuntu), but i can not ping said machine or connect via ssh. Internet and smb-browsing ON this machine work, as does pinging FROM it. If this was a windows machine, I'd say a firewall is in the way, but since it's a vanilla karmic install, this should not be the case (or should it?).
I'm having really weird and frustrating DNS issues with my clients unable to properly resolve the server's ip address. They can resolve each other's, and outside systems, but not the server - at least, not correctly, and not all the time.
I have one Ubuntu server set up that does both DHCP and DNS serving to the Windows systems. The server has DNS forwarding turned on to forward to OpenDNS's servers (I've tried using my ISP's dns servers but the problem remains). The server is *not* set up as a firewall; I am actually using a DLink router for that, and the Dlink is *not* set up to serve up DHCP nor DNS.
What I am getting is that my clients - and there are nothing but Windows clients - will not resolve the name of the server. For example, if I do: ping linuxserver
I get back a false IP address of 192.168.0.64 (and I've seen once a 192.168.2.49).
If, however, I put a dot in there: ping linuxserver.
I get back the *correct* IP address of 192.168.0.2, and thereafter, ping'ng linuxserver without the dot will work. Until the dns cache expires, either naturally or with ipconfig /flushdns on the windows clients.
The client *are* getting valid dhcp leases and can resolve everything happy-happy, they just will not get the proper address of the server 100% of the time.
I am running Ubuntu 9.10 on my desktop right now. I have an external western digital terabyte drive plugged into it. I am able to see it and view it fine. Let's work with my music folder for example. I want to be able to access this music from my Windows 7 laptop so that I may add it to my itunes. However, when I enter the \servershare from the windows 7 laptop it says that the "server" is found but the "share" seems to be invalid. I've checked this 20 times and setting the share name to "music". I've rebooted 2 times on each computer yet to no avail. If I make a share on the Ubuntu desktop I can access it from the laptop. So it seems like it just gets lost when looking inside the external. This was just working last week, then I had to blow away they win 7 lappy and now it just won't work!
In firefox you can type ubuntuforums and it will bring you here via a google query.Mines stopped working the address bar goes to http://ubuntuforums/ and I get a forbidden page.I've check about : config and all is set fine
I'm trying to troubleshoot some strange networking problems. The pattern seems to be that only newer distributions are affected. CentOS 5.4 and Ubuntu 8.04 work fine out-of-the-box. But Arch, Sidux, AntiX, Fedora, etc. show the same pattern of errors.Certain websites cannot be found unless I disable ipv6 in Firefox. And certain addresses cannot be resolved using various terminal commands (wget, apt-get, yum, etc.). What I would ideally like is a permanent solution, perhaps changing some settings on my router, so that I don't have to deal with this each time I test-drive a new distro. I have a hunch the issue has something to do with my DSL provider (Fairpoint) filing for bankruptcy.
One more piece of information that may or may not be relevant: I recently switched a website from one hosting company to another. I noticed there was a delay of several days where I saw the old version at the old host, but viewing the site at a friend's house or the coffee shop showed the new site on the new host. This leads me to suspect DNS issues perhaps, but this is not an area of expertise.
So I'm going to try out opendns as an internet filter. But I'm not doing it on a network/router, just on my local machine. Using ubuntu, I read that I need to select each connection and change the dns settings.Is there a way to generically add the dns settings so that if I connect to a new network I don't have to manually update it's settings?
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?
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.
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!
I am trying to block unappropriated sites on my ubuntu 11.04 with openDNS I installed it and in addithion to the catagoriegs I checked I also added some sites to the always block list, everything according to the site should work. But the problem is that nothing is blocked (also the sites in the always block list). I cleared the browsers cache but it didn't help when i try to clear the local cache with the provided command in their site I think it says it ignored my network.
About firefox,I want to block images only on facebook automatically so I added [URL] to the always block list in the images category and it should work but it just won't block the images. I should note that I use the same method on chrome and there it work like a charm. how to get that working on firefox?
I tried to authenticate using ntlm proxy authentication service and my computer could not retrive the IP address. Currently I am using fedora cammbridge
I've started using OpenDNS on my network, the problem is, my router gets an dynamic IP, which means I have to regularly update the OpenDNS settings.
DDClient apparently supports OpenDNS, but the Ubuntu package for it asks for various details I don't know, and can't find. I'd rather not have to boot up a Windows computer just for this.
So I've got two questions, I guess - first is, are any of the Windows clients known to work under Wine (that can retrieve the IP from the router and forward it), and the second being, how exactly do you set up DDClient to use OpenDNS?
This morning it would not boot; when I tried to wake up the system, it gave me a bunch of errors, the last ones being as follows: "mount error: could not resolve address for servername: No address associated with hostname mountall: mount /media/shares [1402] terminated with status 1" I am writing this in Win 7 since I lost ubuntu. I am using ubuntu 11.04.
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.
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,
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 ..
I recently configure a centos linux distro to use on the internet.my actual plan is to use it as a router to the internet for computers on my network. the system already has two lan cards which i have configured with their appropriate ip addresses. now with this initial configuration i believe i should be able to browse the internet, but my problem now is that i cant even though the lan card pointing to isp is correctly configured with the ips,gateway and dns from my isp. i cant even do a ping to the outside world. I cant really pin point where the issue is coming from but i am guessing maybe my route are not well configured. i get ''unknown host google.com" message when i ping google.com and a ping to my gateway address gives '' Network is unreachable". i have been using this system before as my gateway, but only recently switched isp and i started having this issue when i reconfigure the system to my new isp settings. Now, on a windows system, all goes fine so i have been able to safely remove the fact that maybe it is from my isp from the picture. How do i resolve this?
The computer connects wirelessly to a router. The router is connected to the internet and that is working well. (If i use a cable connection to the router, I can reach the internet).
Why wont the wireless connection reach the Internet? It is a strong connection. It worked before wirelessly. I am on 10.04 beta, with the recent updates installed.
