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HOWTO: Router and DNS problems

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Since the release of the Kernel 2.6 series, many routers with ethernet-connection do not work well with Linux on dhcp/static. The DNS entries (that are important for the successful access of website adresses like... See more » Since the release of the Kernel 2.6 series, many routers with ethernet-connection do not work well with Linux on dhcp/static. The DNS entries (that are important for the successful access of website adresses like www.ubuntulinux.org) in the /etc/resolv.conf are constantly changed (most times in a period of 5 to 15 minutes). The result is that the user will not be able to see any webpage displayed in e.g. firefox but he will get an error message that the request timed out. Although users can still access websites via the IP-adress and ping all sites, no webpage will display in a webbrowser once the resolv.conf is rewritten when using typical adresses like www.ubuntulinux.org. A few simple ways to solve this problem (should work in 90% of cases) is 1. go to synaptic and activate the universe mirrors. Now open a terminal, ping the apt-get mirrors you have chosen. At the same time, open a new tab and install the following packages as superuser, either via pat-get or the synaptic-tool (recommended for newcomers to linux): 1. resolvconf 2. pump 3. dnsmasq Once the download-process starts, the system will ask you if you want to replace some files. Click "OK". Pump will now replace the standard dhcp-client as the newly used webclient for your system. Pump has no auto ipv6 enabled, thus it should work out of the box. After downloading the files, deactivate your network and write valid DNS-entries into your /etc/resolv.conf file, save and restart your network. Your problems should be fixed now. 2. If you don't want to /can't download new packages from the universe mirros, you can fix the problem manually if you are using an ext2 or ext3 filesystem. open your /etc/resolv.conf and set valid DNS-servers, as above. Now save the file. Lock it with "sudo chattr +i /etc/resolv.conf" from a terminal. This will permanently lock your DNS-values. (to unlock, use chattr -i) 3. You can alternatively hack your files even more. Run in a root terminal: echo "net.ipv4.tcp_window_scaling=0">> /etc/sysctl.conf Now type in the same root terminal the following: sed -i -e 's/^alias *net-pf-10 *ipv6/alias net-pf-10 off/' /etc/modprobe.d/aliases Now do not forget to deactivate ipv6 in Firefox. Type "about:config" in the adressbar and in the new searchbar, type "ipv6". Set the "disable-ipv6" entry from false to true by double clicking on "false". Good luck everyone. these are related topics. please take a look at them: https://bugzilla.ubuntu.com/show_bug.cgi?id=4433 https://bugzilla.ubuntu.com/show_bug.cgi?id=5868 https://bugzilla.ubuntu.com/show_bug.cgi?id=7992 See less »

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linux, networking, ubuntu

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HOWTO: Router and DNS problems

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