1.7.0

Configuration of SGi L3 transport

Magma AGW has configuration option to create and provision wireguard tunnel for PGW traffic, This feature is targeted for inbound roaming deployment.

Introduction

Today AGW operator need to have separate networking device to create the tunneling infrastructure for pushing PGW traffic to aggregator host. This scheme also needs separate public IP which is expensive to have these days. By providing support for tunneling traffic from AGW to aggregator host we eliminate both requirement and reduce operation cost of Magma AGW.

Configure PipelineD

PipelineD manages all datapath tunnels, so naturally pipelineD needs configuration for wire-guard tunnel. the tunnel can be configured using pipelined.yml:

sgi_tunnel:
 enabled: true
 type: wg
 enable_default_route: false
 tunnels:
 - wg_local_ip: 172.168.100.1/24
   peer_pub_key: 'VQT+tLY6/xF+k1WqrXeQzlfb8hWMVLcPdtCPvwIUNU0='
   peer_pub_ip: 1.2.3.4
  • sgi_tunnel: option defines a L3 transport tunnels
  • enabled: option to enable this functionality.
  • type: Today pipelineD support wireguard tunnel type only so only supported type is 'wg', There is plan to add support for IPSec tunnel.
  • enable_default_route: Set this to true for routing all traffic via L3 transport including SGi maganagement traffic
  • tunnels: This section defines tunnel endpoint.
  • wg_local_ip: IP address of the wireguard define on AGW
  • peer_pub_key: public key of peer wireguard device.
  • peer_pub_ip: public IP of remote wireguad tunnel host.

Once this configuration is committed to the pipelined.yml file, you need to restart magma service. PipelineD generates private/public key pair if needed and creates magma_wg0 device for wireguard tunnel.

Validate the wireguard tunnel creation by checking wg show cmd.


sudo wg show
interface: magma_wg0
  public key: UMlfoG9ZwCNhpm1ezfL1MfzT2qTBTzkLi30cSrgXTDc=
  private key: (hidden)
  listening port: 9333

peer: VQT+tLY6/xF+k1WqrXeQzlfb8hWMVLcPdtCPvwIUNU0=
  endpoint: 1.2.3.4:9333
  allowed ips: 172.168.100.0/24
  transfer: 0 B received, 740 B sent
  persistent keepalive: every 15 seconds

You need 'public key' from the AGW wiregaurd tunnel to configure the remote endpoint.

Configuration of SPGW

Enable following option to route PGW traffic over L3 tunnel.

agw_l3_tunnel: true

The actual routing rules for PGW are created on demand on inbound roaming UE is attached to the AGW.

Validation of WireGuard tunnel

Validate that tunnel is created and traffic is routed for PGW tunnel using gw show

For example in following scenario PGW IP is routed over wireguard device, you can check allowed ips section of the peer.

sudo wg show
interface: magma_wg0
  public key: UMlfoG9ZwCNhpm1ezfL1MfzT2qTBTzkLi30cSrgXTDc=
  private key: (hidden)
  listening port: 9333

peer: VQT+tLY6/xF+k1WqrXeQzlfb8hWMVLcPdtCPvwIUNU0=
  endpoint: 1.2.3.4:9333
  allowed ips: 192.168.60.141/32, 172.168.100.0/24
  transfer: 0 B received, 10.70 KiB sent
  persistent keepalive: every 15 seconds
← Inbound RoamingNetwork Probe →