[Bug 2025695] Re: systemd-resolved: manually dhclient ethx，dns nameserver in the /etc/resolve.conf will be written duplicate

[Liyuan]

** Information type changed from Public to Public Security

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Title:
  systemd-resolved: manually dhclient ethx，dns nameserver in the
  /etc/resolve.conf will be written duplicate

Status in systemd package in Ubuntu:
  New

Bug description:
  systemd version the issue has been seen with
  249

  Used distribution
  ubuntu22

  Linux kernel version used
  5.15.0-72-generic

  CPU architectures issue was seen on
  None

  Component
  systemd-resolved

  Unexpected behaviour you saw

  https://github.com/systemd/systemd/issues/28055

  not this problem when I was on ubuntu20. The version of systemd is 245

  this problem when I was on ubuntu22. The systemd version is 249

  I compared the codes and suspected that v248 commit cbf23f3
  caused by

  I saw this issuse about netplan on ubuntu
  https://superuser.com/questions/1721017/remove-redundant-dns-servers-in-ubuntu-22-04

  But it doesn't work for dhclient (why I use dhclient, because I found
  it out of curiosity)

  Steps to reproduce the problem
  1: Start a virtual machine on the cloud
  2: Insert multiple network cards (auxiliary network card)
  3: Manually use dhclient to start ethx (except eth0) dhclient -v -d eth1
  4: View /etc/resolve.conf

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