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issues:
- |
As good security practice[0], in Ubuntu Bionic the ``nf_conntrack_helper``
is disabled.
This causes an issue when using the ``pxe`` boot interface with the PXE
environment that breaks some of the Ironic CI tests, since Ironic needs
conntrack for TFTP traffic.
It's still possible to use Ironic with PXE on Ubuntu Xenial, and it's also
possible to use Ironic with PXE on Ubuntu Bionic using a workaround based
on custom firewall rules as shown in [0].
[0] https://home.regit.org/netfilter-en/secure-use-of-helpers/
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