** Description changed:
[Impact]
The iptables-persistent plugins/{15-ip4tables,25-ip6tables}
use ip[6]tables-restore without --noflush unconditionally.
This doesn't play along well with ufw, which starts before
netfilter-persistent typically, and gets its rules flushed.
This makes `ufw status` return that ufw is disabled, which
is misleading, as `ufw.service` is enabled and ufw actually
loaded all its rules correctly (but they were flushed later.)
Some images ship iptables-persistent rules, thus are subject
to this issue if ufw is used.
[Workaround]
Disable the netfilter-persistent.service unit, after rules
have been migrated to ufw.
[Fix]
+ Add options IP[6]TABLES_RESTORE_NOFLUSH (disabled by default)
+ to `/etc/default/netfilter-persistent` to allow not flushing
+ existing ip[6]tables rules.
+
Proposed in Debian bug #998416 [1], Salsa Merge Request [2].
[Test Steps]
- See the Debian bug.
+ See commment #14 (based on the Debian bug.)
+
+ [Regression Potential]
+
+ Regressions would manifest when netfilter-persistent.service
+ starts/loads rules, probably in the form of failures to run
+ ip[6]tables-restore or incorrectly (not) flushing rules.
+
+ Note: there is _no_ behavior change is by default, so users
+ have to opt-in, which should reduce the chances/numbers of
+ potential regressions.
+
+ [Links]
[1] https://bugs.debian.org/998416
[2] https://salsa.debian.org/debian/iptables-persistent/-/merge_requests/3
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https://bugs.launchpad.net/bugs/1949643
Title:
iptables-persistent unconditionally drops existing iptables rules
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