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- Model 720: system.lan0.card
- Model B132L: gsc.lasi.lan.card
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Minimal Configuration Parameters
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| Step | Command |
|---|---|
| Gather information about the existing network configuration. | List all existing interfaces, their status and their MAC addresses: List all configured IP addresses and netmasks: List the routing table entries: |
| Create a TAP interface (not needed if emulator automatic creation is used). |
|
| Activate TAP interface (can also be done via the initialize command in emulator configuration). | # ip link set my_tap0 up |
| Create a new bridge - if needed. | # ip link add name my_bridge type bridge |
| Activate the bridge - if needed | # ip link set my_bridge up |
| If needed, add a physical interface to the bridge. This interface will connect the bridge to the physical LAN (not supported for cloud installations). | # ip link set <physical-int> master my_bridge |
| Remove any configured IP address from the physical interface. | # ip addr delete <ip-address>/<netmask> dev <physical-int> |
| Add the IP address previously configured on the physical interface (or another IP address to be used by the host system) to the bridge interface. | # ip addr add <ip-address>/<netmask> dev my_bridge |
| Add any routes (including the default gateway) to be routed across the bridge interface - if needed. |
|
| Add the TAP interface to the bridge (can also be done via the initialize command in the emulator configuration). | # ip link set my_tap0 master my_bridge |
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| Step | Description |
|---|---|
| Gather information about the existing network configuration. | List all existing interfaces, their status and their MAC addresses: List all configured IP addresses and netmasks: List the routing table entries: |
| If needed, create a new connection for the physical interface to be used with the bridge. |
|
| If needed, create a bridge and set a static IP address for it. | # nmcli con add type bridge autoconnect yes \mybr0 ifname mybr0 \ipv4.method manual ip4 <ipaddr/mask> stp off |
| If needed, activate bridge. | # nmcli con up bridge-mybr0 |
| If needed, add physical interface to bridge (not supported for cloud installations). | # nmcli conn modify <physical-int-conn> master mybr0 \ |
| Activate changes to interface. | # nmcli conn up <physical-int-conn> |
After the bridge has been created, you can let the emulator create a TAP interface automatically and use the initialize command in the emulator configuration to add the required TAP interfaces interface for the emulator to the bridge.
Please note: By default, nmcli commands are persistent (. The connection information is stored in /etc/sysconfig/network-scripts/) if the default plugin in
/etc/NetworkManager/NetworkManager.conf is ifcfg-rh. It is stored in /etc/NetworkManager/system-connections/ if the default plugin is keyfile. Permanent TAP connection information is always stored in the NetworkManager directory unless the network-scripts package is used for configuration.
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Basic Emulator Configuration Using a TAP Interface
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Please note: at the time of writing, this feature is not yet available for nftables.
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Supplemental Information: MACVTAP Interfaces (
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since version 3.0.9)
In some cloud environments, interface settings on the Linux level are not passed properly to the NIC on the cloud level. This can cause problems with network connectivity and, in particular, with network performance. The problem can be solved by using a virtual bridge between host and guest, and by configuring routing or NAT to allow guest communication with other systems. However, such configurations are often complex due to the fact that only the cloud-assigned MAC and IP addresses can be used. On a virtual bridge to which host and guest are attached, this condition cannot be met.
MACVTAP interfaces provide an alternative solution - they are linked to a host NIC and are TAP based. However, when used in passthrough mode, they can use the same MAC and IP address as assigned by the cloud provider.
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