Hi Tom, Yes, turns out it is because of ipv6 with some routers. I disabled ipv6 support with ubuntu and DNS resolution is very fast again. You can do that by editing the file /etc/modprobe.d/aliases
Change the line that says "alias net-pf-10 ipv6 " to "alias net-pf-10 off" And enjoy your nice fast DNS resolution :) Alan On 4/4/07, Tom Inglis <[EMAIL PROTECTED]> wrote: > > Hi Guys, > > I have been having this problem aswell on my desktop and two laptops, > with Dapper, Edgy, and Feisty. > > I think networkmanager is assigning the IP of the router as the top DNS > server in resolv.conf. If I leave it there, DNS lookups are really slow, > whatever the application (browser, imap, apt-get etc), adding 10 to 15 > seconds to the resolution time, and also hindering multiple simultaneous > requests from succeeding, especially say opening websites in different > tabs in quick succession. Removing this IP from the config file fixes > this problem, and resolutions occur in a second or so. > > If you take a look at Wireshark captures, it seems that there may be a > problem with IPv6 which is enabled by default in Ubuntu, and particular > routers. I was told on #ubuntu+1 that this is likely to be the result of > "your router's DNS responds to AAAA requests with A results and this > seems to delay ubuntu from trying an A lookup", but I don't really > understand such things. > > I really hope that you can fix this, and do let me know if there is more > info that I can supply? > > Thanks, > > Tom > > ** Attachment added: "Wireshark Capture with Router IP as DNS" > http://librarian.launchpad.net/7133681/capture > > -- > Very slow resolution when using a router for DNS > https://bugs.launchpad.net/bugs/92040 > You received this bug notification because you are a direct subscriber > of the bug. > -- Very slow resolution when using a router for DNS https://bugs.launchpad.net/bugs/92040 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
