Timeout in milliseconds used to check for the presence of duplicate IP addresses on the network. If an address conflict is detected, the activation will fail. A zero value means that no duplicate address detection is performed, -1 means the default value (either configuration ipvx.dad-timeout override or zero). A value greater than zero is a timeout in milliseconds.
The property is currently implemented only for IPv4.
A string sent to the DHCP server to identify the local machine which the DHCP server may use to customize the DHCP lease and options. When the property is a hex string ('aa:bb:cc') it is interpreted as a binary client ID, in which case the first byte is assumed to be the 'type' field as per RFC 2132 section 9.14 and the remaining bytes may be an hardware address (e.g. '01:xx:xx:xx:xx:xx:xx' where 1 is the Ethernet ARP type and the rest is a MAC address). If the property is not a hex string it is considered as a non-hardware-address client ID and the 'type' field is set to 0.
The special values "mac" and "perm-mac" are supported, which use the current or permanent MAC address of the device to generate a client identifier with type ethernet (01). Currently, these options only work for ethernet type of links.
The special value "ipv6-duid" uses the DUID from "ipv6.dhcp-duid" property as an RFC4361-compliant client identifier. As IAID it uses "ipv4.dhcp-iaid" and falls back to "ipv6.dhcp-iaid" if unset.
The special value "duid" generates a RFC4361-compliant client identifier based on "ipv4.dhcp-iaid" and uses a DUID generated by hashing /etc/machine-id.
The special value "stable" is supported to generate a type 0 client identifier based on the stable-id (see connection.stable-id) and a per-host key. If you set the stable-id, you may want to include the "${DEVICE}" or "${MAC}" specifier to get a per-device key.
If unset, a globally configured default is used. If still unset, the default depends on the DHCP plugin.
If the #NMSettingIPConfig:dhcp-send-hostname property is %TRUE, then the specified FQDN will be sent to the DHCP server when acquiring a lease. This property and #NMSettingIPConfig:dhcp-hostname are mutually exclusive and cannot be set at the same time.
If the #NMSettingIPConfig:dhcp-send-hostname property is %TRUE, then the specified name will be sent to the DHCP server when acquiring a lease. This property and #NMSettingIP4Config:dhcp-fqdn are mutually exclusive and cannot be set at the same time.
Flags for the DHCP hostname and FQDN.
Currently, this property only includes flags to control the FQDN flags set in the DHCP FQDN option. Supported FQDN flags are %NM_DHCP_HOSTNAME_FLAG_FQDN_SERV_UPDATE, %NM_DHCP_HOSTNAME_FLAG_FQDN_ENCODED and %NM_DHCP_HOSTNAME_FLAG_FQDN_NO_UPDATE. When no FQDN flag is set and %NM_DHCP_HOSTNAME_FLAG_FQDN_CLEAR_FLAGS is set, the DHCP FQDN option will contain no flag. Otherwise, if no FQDN flag is set and %NM_DHCP_HOSTNAME_FLAG_FQDN_CLEAR_FLAGS is not set, the standard FQDN flags are set in the request: %NM_DHCP_HOSTNAME_FLAG_FQDN_SERV_UPDATE, %NM_DHCP_HOSTNAME_FLAG_FQDN_ENCODED for IPv4 and %NM_DHCP_HOSTNAME_FLAG_FQDN_SERV_UPDATE for IPv6.
When this property is set to the default value %NM_DHCP_HOSTNAME_FLAG_NONE, a global default is looked up in NetworkManager configuration. If that value is unset or also %NM_DHCP_HOSTNAME_FLAG_NONE, then the standard FQDN flags described above are sent in the DHCP requests.
A string containing the "Identity Association Identifier" (IAID) used by the DHCP client. The property is a 32-bit decimal value or a special value among "mac", "perm-mac", "ifname" and "stable". When set to "mac" (or "perm-mac"), the last 4 bytes of the current (or permanent) MAC address are used as IAID. When set to "ifname", the IAID is computed by hashing the interface name. The special value "stable" can be used to generate an IAID based on the stable-id (see connection.stable-id), a per-host key and the interface name. When the property is unset, the value from global configuration is used; if no global default is set then the IAID is assumed to be "ifname". Note that at the moment this property is ignored for IPv6 by dhclient, which always derives the IAID from the MAC address.
Array of servers from which DHCP offers must be rejected. This property is useful to avoid getting a lease from misconfigured or rogue servers.
For DHCPv4, each element must be an IPv4 address, optionally followed by a slash and a prefix length (e.g. "192.168.122.0/24").
This property is currently not implemented for DHCPv6.
If %TRUE, a hostname is sent to the DHCP server when acquiring a lease. Some DHCP servers use this hostname to update DNS databases, essentially providing a static hostname for the computer. If the #NMSettingIPConfig:dhcp-hostname property is %NULL and this property is %TRUE, the current persistent hostname of the computer is sent.
A timeout for a DHCP transaction in seconds. If zero (the default), a globally configured default is used. If still unspecified, a device specific timeout is used (usually 45 seconds).
Set to 2147483647 (MAXINT32) for infinity.
The Vendor Class Identifier DHCP option (60). Special characters in the data string may be escaped using C-style escapes, nevertheless this property cannot contain nul bytes. If the per-profile value is unspecified (the default), a global connection default gets consulted. If still unspecified, the DHCP option is not sent to the server.
Since 1.28
Array of IP addresses of DNS servers.
Array of DNS options as described in man 5 resolv.conf.
%NULL means that the options are unset and left at the default. In this case NetworkManager will use default options. This is distinct from an empty list of properties.
The currently supported options are "attempts", "debug", "edns0", "inet6", "ip6-bytestring", "ip6-dotint", "ndots", "no-check-names", "no-ip6-dotint", "no-reload", "no-tld-query", "rotate", "single-request", "single-request-reopen", "timeout", "trust-ad", "use-vc".
The "trust-ad" setting is only honored if the profile contributes name servers to resolv.conf, and if all contributing profiles have "trust-ad" enabled.
When using a caching DNS plugin (dnsmasq or systemd-resolved in NetworkManager.conf) then "edns0" and "trust-ad" are automatically added.
DNS servers priority.
The relative priority for DNS servers specified by this setting. A lower numerical value is better (higher priority).
Negative values have the special effect of excluding other configurations with a greater numerical priority value; so in presence of at least one negative priority, only DNS servers from connections with the lowest priority value will be used. To avoid all DNS leaks, set the priority of the profile that should be used to the most negative value of all active connections profiles.
Zero selects a globally configured default value. If the latter is missing or zero too, it defaults to 50 for VPNs (including WireGuard) and 100 for other connections.
Note that the priority is to order DNS settings for multiple active connections. It does not disambiguate multiple DNS servers within the same connection profile.
When multiple devices have configurations with the same priority, VPNs will be considered first, then devices with the best (lowest metric) default route and then all other devices.
When using dns=default, servers with higher priority will be on top of resolv.conf. To prioritize a given server over another one within the same connection, just specify them in the desired order. Note that commonly the resolver tries name servers in /etc/resolv.conf in the order listed, proceeding with the next server in the list on failure. See for example the "rotate" option of the dns-options setting. If there are any negative DNS priorities, then only name servers from the devices with that lowest priority will be considered.
When using a DNS resolver that supports Conditional Forwarding or Split DNS (with dns=dnsmasq or dns=systemd-resolved settings), each connection is used to query domains in its search list. The search domains determine which name servers to ask, and the DNS priority is used to prioritize name servers based on the domain. Queries for domains not present in any search list are routed through connections having the '~.' special wildcard domain, which is added automatically to connections with the default route (or can be added manually). When multiple connections specify the same domain, the one with the best priority (lowest numerical value) wins. If a sub domain is configured on another interface it will be accepted regardless the priority, unless parent domain on the other interface has a negative priority, which causes the sub domain to be shadowed. With Split DNS one can avoid undesired DNS leaks by properly configuring DNS priorities and the search domains, so that only name servers of the desired interface are configured.
Array of DNS search domains. Domains starting with a tilde ('~') are considered 'routing' domains and are used only to decide the interface over which a query must be forwarded; they are not used to complete unqualified host names.
When using a DNS plugin that supports Conditional Forwarding or Split DNS, then the search domains specify which name servers to query. This makes the behavior different from running with plain /etc/resolv.conf. For more information see also the dns-priority setting.
The gateway associated with this configuration. This is only meaningful if #NMSettingIPConfig:addresses is also set.
The gateway's main purpose is to control the next hop of the standard default route on the device. Hence, the gateway property conflicts with #NMSettingIPConfig:never-default and will be automatically dropped if the IP configuration is set to never-default.
As an alternative to set the gateway, configure a static default route with /0 as prefix length.
When #NMSettingIPConfig:method is set to "auto" and this property to %TRUE, automatically configured name servers and search domains are ignored and only name servers and search domains specified in the #NMSettingIPConfig:dns and #NMSettingIPConfig:dns-search properties, if any, are used.
When #NMSettingIPConfig:method is set to "auto" and this property to %TRUE, automatically configured routes are ignored and only routes specified in the #NMSettingIPConfig:routes property, if any, are used.
If %TRUE, allow overall network configuration to proceed even if the configuration specified by this property times out. Note that at least one IP configuration must succeed or overall network configuration will still fail. For example, in IPv6-only networks, setting this property to %TRUE on the #NMSettingIP4Config allows the overall network configuration to succeed if IPv4 configuration fails but IPv6 configuration completes successfully.
IP configuration method.
#NMSettingIP4Config and #NMSettingIP6Config both support "disabled", "auto", "manual", and "link-local". See the subclass-specific documentation for other values.
In general, for the "auto" method, properties such as #NMSettingIPConfig:dns and #NMSettingIPConfig:routes specify information that is added on to the information returned from automatic configuration. The #NMSettingIPConfig:ignore-auto-routes and #NMSettingIPConfig:ignore-auto-dns properties modify this behavior.
For methods that imply no upstream network, such as "shared" or "link-local", these properties must be empty.
For IPv4 method "shared", the IP subnet can be configured by adding one manual IPv4 address or otherwise 10.42.x.0/24 is chosen. Note that the shared method must be configured on the interface which shares the internet to a subnet, not on the uplink which is shared.
If %TRUE, this connection will never be the default connection for this IP type, meaning it will never be assigned the default route by NetworkManager.
The minimum time interval in milliseconds for which dynamic IP configuration should be tried before the connection succeeds.
This property is useful for example if both IPv4 and IPv6 are enabled and are allowed to fail. Normally the connection succeeds as soon as one of the two address families completes; by setting a required timeout for e.g. IPv4, one can ensure that even if IP6 succeeds earlier than IPv4, NetworkManager waits some time for IPv4 before the connection becomes active.
Note that if #NMSettingIPConfig:may-fail is FALSE for the same address family, this property has no effect as NetworkManager needs to wait for the full DHCP timeout.
A zero value means that no required timeout is present, -1 means the default value (either configuration ipvx.required-timeout override or zero).
The default metric for routes that don't explicitly specify a metric. The default value -1 means that the metric is chosen automatically based on the device type. The metric applies to dynamic routes, manual (static) routes that don't have an explicit metric setting, address prefix routes, and the default route. Note that for IPv6, the kernel accepts zero (0) but coerces it to 1024 (user default). Hence, setting this property to zero effectively mean setting it to 1024. For IPv4, zero is a regular value for the metric.
Enable policy routing (source routing) and set the routing table used when adding routes.
This affects all routes, including device-routes, IPv4LL, DHCP, SLAAC, default-routes and static routes. But note that static routes can individually overwrite the setting by explicitly specifying a non-zero routing table.
If the table setting is left at zero, it is eligible to be overwritten via global configuration. If the property is zero even after applying the global configuration value, policy routing is disabled for the address family of this connection.
Policy routing disabled means that NetworkManager will add all routes to the main table (except static routes that explicitly configure a different table). Additionally, NetworkManager will not delete any extraneous routes from tables except the main table. This is to preserve backward compatibility for users who manage routing tables outside of NetworkManager.
Array of IP routes.
Array of IP addresses.