[Bug 1993105] Re: can't add more than ~1024 IP addresses

[Lukas Märdian]

Thank you for your investigation Thomasz, I've assigned the bug to the
systemd project instead of netplan.

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/24852
   Importance: Unknown
       Status: Unknown

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: netplan
       Status: New => Invalid

** Changed in: systemd (Ubuntu)
       Status: New => Triaged

** Changed in: systemd (Ubuntu)
   Importance: Undecided => Low

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Title:
  can't add more than ~1024 IP addresses

Status in netplan:
  Invalid
Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  I've migrated from Debian (using /etc/network/interfaces) to Ubuntu
  22.04 (using netplan). To my surprise, it's not possible to add more
  than 1024 IP addresses using netplan.

  It errors in syslog with:

  Oct 17 07:19:50 ktsend11 systemd-networkd[678]: /run/systemd/network/10-netplan-ens192.network:3299: Failed to allocate new address, ignoring assignment: Argument list too long
  Oct 17 07:19:50 ktsend11 systemd-networkd[678]: /run/systemd/network/10-netplan-ens192.network:3300: Failed to allocate new address, ignoring assignment: Argument list too long
  Oct 17 07:19:50 ktsend11 systemd-networkd[678]: /run/systemd/network/10-netplan-ens192.network:3301: Failed to allocate new address, ignoring assignment: Argument list too long
  Oct 17 07:19:50 ktsend11 systemd-networkd[678]: /run/systemd/network/10-netplan-ens192.network:3302: Failed to allocate new address, ignoring assignment: Argument list too long

  
  As a result, only around 1024 IPs are present in the system:

  # ip addr|grep -c inet
  1027

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