Information
firewalld (Dynamic Firewall Manager) provides a dynamically managed firewall with support for network/firewall 'zones' to assign a level of trust to a network and its associated connections, interfaces or sources. It has support for IPv4, IPv6, Ethernet bridges and also for IPSet firewall settings. There is a separation of the runtime and permanent configuration options.
Rationale:
Running iptables.service andor ip6tables.service with firewalld.service may lead to conflict and unexpected results.
Solution
Run the following command to remove firewalld
# zypper remove firewalld
OR
Run the following command to stop and mask firewalld
# systemctl --now mask firewalld