Network configuration
LXD supports creating and managing bridges, below is a list of the configuration options supported for those bridges.
Note that this feature was introduced as part of API extension "network".
The key/value configuration is namespaced with the following namespaces currently supported:
bridge(L2 interface configuration)fan(configuration specific to the Ubuntu FAN overlay)tunnel(cross-host tunneling configuration)ipv4(L3 IPv4 configuration)ipv6(L3 IPv6 configuration)dns(DNS server and resolution configuration)raw(raw configuration file content)user(free form key/value for user metadata)
It is expected that IP addresses and subnets are given using CIDR notation (1.1.1.1/24 or fd80:1234::1/64).
The exception being tunnel local and remote addresses which are just plain addresses (1.1.1.1 or fd80:1234::1).
| Key | Type | Condition | Default | Description |
|---|---|---|---|---|
| bridge.driver | string | - | native | Bridge driver ("native" or "openvswitch") |
| bridge.external_interfaces | string | - | - | Comma separate list of unconfigured network interfaces to include in the bridge |
| bridge.mode | string | - | standard | Bridge operation mode ("standard" or "fan") |
| bridge.mtu | integer | - | 1500 | Bridge MTU (default varies if tunnel or fan setup) |
| dns.domain | string | - | lxd | Domain to advertise to DHCP clients and use for DNS resolution |
| dns.mode | string | - | managed | DNS registration mode ("none" for no DNS record, "managed" for LXD generated static records or "dynamic" for client generated records) |
| fan.overlay_subnet | string | fan mode | 240.0.0.0/8 | Subnet to use as the overlay for the FAN (CIDR notation) |
| fan.type | string | fan mode | vxlan | The tunneling type for the FAN ("vxlan" or "ipip") |
| fan.underlay_subnet | string | fan mode | default gateway subnet | Subnet to use as the underlay for the FAN (CIDR notation) |
| ipv4.address | string | standard mode | random unused subnet | IPv4 address for the bridge (CIDR notation). Use "none" to turn off IPv4 or "auto" to generate a new one |
| ipv4.dhcp | boolean | ipv4 address | true | Whether to allocate addresses using DHCP |
| ipv4.dhcp.expiry | string | ipv4 dhcp | 1h | When to expire DHCP leases |
| ipv4.dhcp.gateway | string | ipv4 dhcp | ipv4.address | Address of the gateway for the subnet |
| ipv4.dhcp.ranges | string | ipv4 dhcp | all addresses | Comma separated list of IP ranges to use for DHCP (FIRST-LAST format) |
| ipv4.firewall | boolean | ipv4 address | true | Whether to generate filtering firewall rules for this network |
| ipv4.nat | boolean | ipv4 address | false | Whether to NAT (will default to true if unset and a random ipv4.address is generated) |
| ipv4.routes | string | ipv4 address | - | Comma separated list of additional IPv4 CIDR subnets to route to the bridge |
| ipv4.routing | boolean | ipv4 address | true | Whether to route traffic in and out of the bridge |
| ipv6.address | string | standard mode | random unused subnet | IPv6 address for the bridge (CIDR notation). Use "none" to turn off IPv6 or "auto" to generate a new one |
| ipv6.dhcp | boolean | ipv6 address | true | Whether to provide additional network configuration over DHCP |
| ipv6.dhcp.expiry | string | ipv6 dhcp | 1h | When to expire DHCP leases |
| ipv6.dhcp.ranges | string | ipv6 stateful dhcp | all addresses | Comma separated list of IPv6 ranges to use for DHCP (FIRST-LAST format) |
| ipv6.dhcp.stateful | boolean | ipv6 dhcp | false | Whether to allocate addresses using DHCP |
| ipv6.firewall | boolean | ipv6 address | true | Whether to generate filtering firewall rules for this network |
| ipv6.nat | boolean | ipv6 address | false | Whether to NAT (will default to true if unset and a random ipv6.address is generated) |
| ipv6.routes | string | ipv6 address | - | Comma separated list of additional IPv6 CIDR subnets to route to the bridge |
| ipv6.routing | boolean | ipv6 address | true | Whether to route traffic in and out of the bridge |
| raw.dnsmasq | string | - | - | Additional dnsmasq configuration to append to the configuration |
| tunnel.NAME.group | string | vxlan | 239.0.0.1 | Multicast address for vxlan (used if local and remote aren't set) |
| tunnel.NAME.id | integer | vxlan | 0 | Specific tunnel ID to use for the vxlan tunnel |
| tunnel.NAME.interface | string | vxlan | - | Specific host interface to use for the tunnel |
| tunnel.NAME.local | string | gre or vxlan | - | Local address for the tunnel (not necessary for multicast vxlan) |
| tunnel.NAME.port | integer | vxlan | 0 | Specific port to use for the vxlan tunnel |
| tunnel.NAME.protocol | string | standard mode | - | Tunneling protocol ("vxlan" or "gre") |
| tunnel.NAME.remote | string | gre or vxlan | - | Remote address for the tunnel (not necessary for multicast vxlan) |
Those keys can be set using the lxc tool with:
lxc network set <network> <key> <value>