[Bug 1534055] Re: Increase MAXNS to at least 4 as we are in age of dualstack systems

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: glibc (Ubuntu)
       Status: New => Confirmed

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Title:
  Increase MAXNS to at least 4 as we are in age of dualstack systems

Status in glibc package in Ubuntu:
  Confirmed

Bug description:
  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)

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