Public bug reported: Currently, according to resolv.comf manpage, it's 3 which might work with singlestack systems, but in dualstack systems ISPs generally have twoIPv4 nameservers and two IPv6 nameservers.
With the current MAXNS Ubuntu only receives three nameservers instead of four which the ISP has (meaning two IPv4 DNS servers and one IPv6 one while even Windows allows 2 two DNS servers per internet protocol version). ``` nameserver Name server IP address Internet address of a name server that the resolver should query, either an IPv4 address (in dot notation), or an IPv6 address in colon (and possibly dot) notation as per RFC 2373. Up to MAXNS (currently 3, see <resolv.h>) name servers may be listed, one per keyword. If there are multiple servers, the resolver library queries them in the order listed. If no name‐ server entries are present, the default is to use the name server on the local machine. (The algorithm used is to try a name server, and if the query times out, try the next, until out of name servers, then repeat trying all the name servers until a maximum number of retries are made.) ``` ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: libc6-dev 2.21-0ubuntu5 ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3 Uname: Linux 4.3.0-5-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.19.3-0ubuntu3 Architecture: amd64 CurrentDesktop: MATE Date: Thu Jan 14 10:23:51 2016 InstallationDate: Installed on 2015-12-12 (32 days ago) InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151212) SourcePackage: glibc UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: glibc (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug dualstack ipv4 ipv6 xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1534055 Title: Increase MAXNS to at least 4 as we are in age of dualstack systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1534055/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs