CONFIG_NF_CONNTRACK_NETBIOS_NS: NetBIOS name service protocol support

General informations

The Linux kernel configuration item CONFIG_NF_CONNTRACK_NETBIOS_NS has multiple definitions:

NetBIOS name service protocol support found in net/netfilter/Kconfig

The configuration item CONFIG_NF_CONNTRACK_NETBIOS_NS:

• prompt: NetBIOS name service protocol support
• type: tristate
• depends on: (none)
• defined in net/netfilter/Kconfig
• found in Linux kernels: 2.6.25–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12
• modules built: nf_conntrack_netbios_ns

Help text

NetBIOS name service requests are sent as broadcast messages from an unprivileged port and responded to with unicast messages to the same port. This make them hard to firewall properly because connection tracking doesn't deal with broadcasts. This helper tracks locally originating NetBIOS name service requests and the corresponding responses. It relies on correct IP address configuration, specifically netmask and broadcast address. When properly configured, the output of "ip address show" should look similar to this:

$ ip -4 address show eth0 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0

To compile it as a module, choose M here. If unsure, say N.

NetBIOS name service protocol support (EXPERIMENTAL) found in net/netfilter/Kconfig

The configuration item CONFIG_NF_CONNTRACK_NETBIOS_NS:

• prompt: NetBIOS name service protocol support (EXPERIMENTAL)
• type: tristate
• depends on: CONFIG_EXPERIMENTAL && CONFIG_NF_CONNTRACK
• defined in net/netfilter/Kconfig
• found in Linux kernels: 2.6.20–2.6.24
• modules built: nf_conntrack_netbios_ns

Help text

NetBIOS name service requests are sent as broadcast messages from an unprivileged port and responded to with unicast messages to the same port. This make them hard to firewall properly because connection tracking doesn't deal with broadcasts. This helper tracks locally originating NetBIOS name service requests and the corresponding responses. It relies on correct IP address configuration, specifically netmask and broadcast address. When properly configured, the output of "ip address show" should look similar to this:

$ ip -4 address show eth0 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0

To compile it as a module, choose M here. If unsure, say N.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb module nf_conntrack_netbios_ns CONFIG_NF_CONNTRACK_NETBIOS_NS : net/netfilter/Kconfig : "NetBIOS name service protocol support" # in 2.6.20–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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