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[I'm filing against RHEL7, but RHEL8 has the same issue.]
Description of problem:
Unlike both firewalld.service and nftables.service, iptables.service lacks these [Unit] settings:
Wants=network-pre.target
Before=network-pre.target
Because of this, on systems that use iptables, other network-related services can start before iptables starts.
This has at least two effects:
1. There is potentially a window when the network is up, and a network service has started, but iptables rules designed to filter that service are not yet in effect, because systemd has not yet started the iptables service.
2. Services that manage their own iptables rules (e.g., libvirtd.service) can add rules that are later duplicated when iptables starts and restores saved rules.
To resolve this, the iptables.service unit file should be updated to include these [Unit] settings:
Wants=network-pre.target
Before=network-pre.target
This will make iptables consistent with the other services (firewalld, nftables) that also provide firewall services.
Version-Release number of selected component (if applicable):
iptables-1.4.21-28.el7.x86_64
iptables-1.8.2-9.el8.x86_64
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:1174