aligungr/UERANSIM

Disable IPv6 on ueransim and open5gs

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kvescovi commented

In a secure environment, it is not desirable to run IPv6 if it is not needed. Can IPv6 be disabled at the system level?
My attempt was the following:

  1. Comment out all /etc/open5gs/*.yaml config lines referencing IPv6 on open5gs host.
  2. On open5gs host, comment out /etc/systemd/network/99-open5gs.network/ 99-open5gs.network line with Address=2001:db8:cafe::1/48
  3. Removed # to disable IPv6 in /etc/defaults/grub on both ueransim and open5gs
    GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
    commented out
    #GRUB_CMDLINE_LINUX=""
    update-grub
  4. Rebooted ueransim and open5gs hosts.

After this, the gNb failed to initialize when starting.

Can IPv6 be disabled?
Leaving the IPv6 config lines commented out and re-enabling IPv6 at the system level pretty much shuts off IPv6, but would like to disable at the system level.