DNS-Only Networks In legacy environments, NetBIOS over TCP/IP is essential for browsing and name resolution, requiring the open UDP ports 137 and 138. systems using `nftables` or `iptables` require rules that specify the source and destination addresses.
Samba Firewall Rule Conceptual Example: Core Ports and Protocol Direction
This reduces the attack surface significantly while preserving functionality for file transfers. Core Ports and Protocols The foundation of a Samba firewall configuration is allowing the correct traffic through the network perimeter.
0/0`), you should scope the rules tightly. Protocol Port Direction Purpose TCP 139 Inbound/Outbound NetBIOS Session Service TCP 445 Inbound/Outbound Direct hosting of SMB over TCP UDP 137 Inbound/Outbound NetBIOS Name Service UDP 138 Inbound/Outbound NetBIOS Datagram Service Addressing NetBIOS vs.
Samba Firewall Rule Conceptual Example: Core Ports and Protocols
Here is how you might define such a rule conceptually. Modern versions, however, rely on a more complex interaction of ports, depending on whether you are using NetBIOS over TCP (NBT) or pure DNS-based discovery.
More About Samba firewall
Looking at Samba firewall from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Samba firewall can make the topic easier to follow by connecting earlier points with a few simple takeaways.
