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https://bugs.launchpad.net/bugs/1956243

Title:
  Ping give socket  error initially if IPv6 is disabled

Status in iputils package in Ubuntu:
  New

Bug description:
  With IpV6 enabled everything works well. However if you disable ipv6 by 
editing /etc/default/grub with the following entry
  GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
   then when you ping there is an initial socket error 

  ping localhost
  ping: socket: Address family not supported by protocol
  PING localhost (127.0.0.1) 56(84) bytes of data.
  64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.046 ms
  64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.038 ms
  64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.028 ms
  64 bytes from localhost (127.0.0.1): icmp_seq=4 ttl=64 time=0.028 ms

  
  however ping -4 works

  ping -4 localhost
  PING localhost (127.0.0.1) 56(84) bytes of data.
  64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.032 ms
  64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.029 ms
  64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.021 ms

  so it looks like ping is trying ipv6 first and not detecting that its
  disabled.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: iputils-ping 3:20210202-1build1
  ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
  Uname: Linux 5.13.0-19-generic x86_64
  ApportVersion: 2.20.11-0ubuntu74
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Mon Jan  3 17:42:07 2022
  InstallationDate: Installed on 2022-01-03 (0 days ago)
  InstallationMedia: Ubuntu-Server 22.04 LTS "Jammy Jellyfish" - Alpha amd64 
(20211029)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: iputils
  UpgradeStatus: No upgrade log present (probably fresh install)

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