Virtual Network

The first network configuration task is to define a Virtual Network. This will define how sites will connect to each other and whether they will advertise network routes between sites or rely on source address translation.


Exercise 1: Examine Global Network Client

  1. Before we create a Virtual Network login to the “Global Network Client” in UDF via web shell or ssh.

  2. Run netstat -rn to observe the route table.

    ubuntu@ubuntu:~$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         10.1.20.6       0.0.0.0         UG        0 0          0 ens6
10.1.1.0        0.0.0.0         255.255.255.0   U         0 0          0 ens5
10.1.20.0       0.0.0.0         255.255.255.0   U         0 0          0 ens6
172.17.0.0      0.0.0.0         255.255.0.0     U         0 0          0 docker0

  3. Observe that this device is pointing to the F5 Distributed Cloud Gateway Site Local Inside (sli)interface (10.1.20.6).

  4. Next run systemd-resolve --status and see that the F5 Distributed Cloud Gateway is also configured as the only DNS resolver for this host.

    $ systemd-resolve --status
...
Link 3 (ens6)
      Current Scopes: DNS
...
         DNS Servers: 10.1.20.6
...

  5. Try to resolve a DNS name and access an external service.

    ubuntu@ubuntu:~$ ping -w 3 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2051ms

ubuntu@ubuntu:~$ curl -m 3 www.f5.com
curl: (28) Resolving timed out after 3514 milliseconds

Exercise 2: Create Virtual Network

  1. From the Cloud and Edge Sites context go under “Manage”->”Networking”->”Virtual Networks”.

    ../../_images/xc-virtual-network-menu.png

  2. Click on “Add Virtual Network”.

    Provide a name, i.e. ([your namespace]-global) and specify “Global Network” as the specified type. This will allow the sites to extend their network into other sites (requires non-overlapping IP space accross sites). You can also specify a network type of “Site Local” to specify that you want the network to be specific to the Site (not shared).

  3. Click on “Save and Exit”