Update OpenStack networking reference

Networking technical reference for `brno-g2-site` and `ostrava-g2-site`.

topics/compute/openstack/docs/technical-reference/brno-g2-site/networking.md

@@ -7,11 +7,57 @@ search:
 
 # Networking
 
-Currently in Brno G2 site you can use following floating IP networks:
+## IPv4
+
+There are 2 generally available external networks, which you can allocate floating IP addresses (FIPs) from:
+- `external-ipv4-general-public` (recommended)
+  - This network has 2 address pools:
+    - `147.251.245.0/24`
+    - `147.251.255.0/24`
+  - FIPs from this network are publicly accessible.
+- `external-ipv4-general-muni`
+  - This network has 1 address pool:
+    - `10.16.176.0/20`
+  - FIPs from this network are NOT publicly accessible, they can only be reached from within the Masaryk University (internal Masaryk University network).
+  - Please be aware that your instances in personal and group projects will typically be connected to internal networks which do not provide
+    a route to this external network.
+    In case of group projects, you can bypass this limitation by creating a new router with a gateway to the external network `external-ipv4-general-muni`
+    and interface in your internal network.
+    See [Create Router How-to Guide](../../../how-to-guides/create-router.md).
+
+
+### Personal Projects
+
+Due to limited resources available in personal projects, the easiest way is to connect your instances to the shared internal network:
+- `internal-ipv4-general-private`
+
+From this network, you will be able to allocate a floating IP address from the external network:
+- `external-ipv4-general-public`
+
+
+### Group Projects
+
+By default, group projects are provided with a default internal network:
+- `group-project-network` (192.168.0.0/24)
+
+This network already has a route to the recommended external network `external-ipv4-general-public`, which means you can associate FIPs from this
+external network to instances connected to the default internal network.
+
+You may also use the `internal-ipv4-general-private` internal network with the same effect.
+
+In case you create your own internal network (see [Create Networking How-to Guide](../../../how-to-guides/create-networking.md)), you need to handle the routing
+yourself, i.e. create a new router (see [Create Router How-to Guide](../../../how-to-guides/create-router.md)), if you want to assign FIPs from an external network
+to your instances.
+This is especially true if you want to use the `external-ipv4-general-muni` external network ([see above](#ipv4)).
+
+
+## IPv6
+
+Currently in Brno G2 site, you can use following IPv6 network:
+
+- ~~`external-ipv6-general-public` (2001:718:801:43b::/64)~~ (not GA yet, in testing as of 2024-12-06)
 
-- `external-ipv4-general-public-147-251-255-0` (147.251.255.0/24)
-- ~~`external-ipv6-general-public-2001-718-801-43b` (2001:718:801:43b::/64)~~ (not GA yet, in testing as of 2023-12-05)
 
 ## Security groups
 
-Apart from the `default` [security group](../../../docs/additional-information/security-groups.md), every project in OpenStack cloud soon after creation pre-generated security group `ssh`. Rules of the `ssh` groups enables access to virtual servers via SSH protocol (IPv4+IPv6).
+Apart from the `default` [security group](../../../additional-information/security-groups.md), every project in the OpenStack cloud also contains pre-generated security group `ssh`. Rules of the `ssh` groups enable access to virtual servers via SSH protocol (IPv4+IPv6).

topics/compute/openstack/docs/technical-reference/ostrava-g2-site/networking.md

@@ -7,11 +7,39 @@ search:
 
 # Networking
 
-## Floating IP networks
+## IPv4
+
+There are 2 generally available external networks, which you can allocate floating IP addresses (FIPs) from:
+- `external-ipv4-general-public` (recommended)
+  - This network has 2 address pools:
+    - `195.113.243.0/24`
+  - FIPs from this network are publicly accessible.
+
+
+### Personal Projects
+
+Due to limited resources available in personal projects, the easiest way is to connect your instances to the shared internal network:
+- `internal-ipv4-general-private`
+
+From this network, you will be able to allocate a floating IP address from the external network:
+- `external-ipv4-general-public`
+
+
+### Group Projects
+
+By default, group projects are provided with a default internal network:
+- `group-project-network` (192.168.0.0/24)
+
+This network already has a route to the recommended external network `external-ipv4-general-public`, which means you can associate FIPs from this
+external network to instances connected to the default internal network.
+
+You may also use the `internal-ipv4-general-private` internal network with the same effect.
+
+In case you create your own internal network (see [Create Networking How-to Guide](../../../how-to-guides/create-networking.md)), you need to handle the routing
+yourself, i.e. create a new router (see [Create Router How-to Guide](../../../how-to-guides/create-router.md)), if you want to assign FIPs from an external network
+to your instances.
 
-Currently in Ostrava G2 site you can use following floating IP networks:
- - `provider-ipv4-general-public` (195.113.243.0/24)
 
 ## Security groups
 
-Apart from the `default` [security group](../../../docs/additional-information/security-groups.md), every project in OpenStack cloud contains also pre-generated security group `ssh`. Rules of the `ssh` groups enables access to virtual servers via SSH protocol.
+Apart from the `default` [security group](../../../additional-information/security-groups.md), every project in the OpenStack cloud also contains pre-generated security group `ssh`. Rules of the `ssh` groups enable access to virtual servers via SSH protocol (IPv4+IPv6).