Operations grimoire/Network
Network ranges and topology
172.27.27.0/24
Nasqueron servers are managed through Drake Network private IPs.
This subnet is divided into 16 subnets of 16 addresses.
| Subnet ID | Subnet Address | Host Address Range | Broadcast Address | Subnet Name | Description |
|---|---|---|---|---|---|
| 1 | 172.27.27.0 | 172.27.27.1 - 172.27.27.14 | 172.27.27.15 | IntraNought | VMs hosted on DreadNought hypervisor |
| 2 | 172.27.27.16 | 172.27.27.17 - 172.27.27.30 | 172.27.27.31 | prod.nasqueron.drake | Service mesh in prod (Kubernetes) ✱ |
| 3 | 172.27.27.32 | 172.27.27.33 - 172.27.27.46 | 172.27.27.47 | dev.nasqueron.drake | Development servers ✱ |
| 4 | 172.27.27.48 | 172.27.27.49 - 172.27.27.62 | 172.27.27.63 | free | |
| 5 | 172.27.27.64 | 172.27.27.65 - 172.27.27.78 | 172.27.27.79 | free | |
| 6 | 172.27.27.80 | 172.27.27.81 - 172.27.27.94 | 172.27.27.95 | free | |
| 7 | 172.27.27.96 | 172.27.27.97 - 172.27.27.110 | 172.27.27.111 | free | |
| 8 | 172.27.27.112 | 172.27.27.113 - 172.27.27.126 | 172.27.27.127 | free | |
| 9 | 172.27.27.128 | 172.27.27.129 - 172.27.27.142 | 172.27.27.143 | free | |
| 10 | 172.27.27.144 | 172.27.27.145 - 172.27.27.158 | 172.27.27.159 | free | |
| 11 | 172.27.27.160 | 172.27.27.161 - 172.27.27.174 | 172.27.27.175 | free | |
| 12 | 172.27.27.176 | 172.27.27.177 - 172.27.27.190 | 172.27.27.191 | free | |
| 13 | 172.27.27.192 | 172.27.27.193 - 172.27.27.206 | 172.27.27.207 | free | |
| 14 | 172.27.27.208 | 172.27.27.209 - 172.27.27.222 | 172.27.27.223 | free | |
| 15 | 172.27.27.224 | 172.27.27.225 - 172.27.27.238 | 172.27.27.239 | free | |
| 16 | 172.27.27.240 | 172.27.27.241 - 172.27.27.254 | 172.27.27.255 | Tunnels | Tunneling to router-001.nasqueron.org |
✱ denotes currently a false subnet, containing isolated bare metal servers, not linked to any private network excepted through tunnels, with IP are assigned as /32 (netmask 255.255.255.255 0xffffffff)
172.27.27.0/29
IntraNought, VM hosted on Dreadnought
Netmask: 255.255.255.248 / 0xFFFFFFF8
| IP | Server | Reverse DNS | OS | Purpose | AUP |
|---|---|---|---|---|---|
| 172.27.27.1 | router-001 | router-001.nasqueron.drake | FreeBSD 12 | Router | Infrastructure server |
| 172.27.27.2 | Reserved for DNS server | ||||
| 172.27.27.3 | Reserved for mail server | ||||
| 172.27.27.4 | Dwellers | dwellers.nasqueron.drake | CentOS 8 | Docker development server hosting | Open for Docker images building |
| 172.27.27.5 | Equatower | equatower.nasqueron.drake | CentOS 8 | Docker engine | Infrastructure server |
| 172.27.27.6 | docker-001 | docker-001.nasqueron.drake | CentOS 8 | Docker engine | Infrastructure server |
| 172.27.27.7 | Free | ||||
| ... | Free | ||||
| 172.27.27.14 | Free | ||||
172.27.27.16/29
Servers for the production service mesh. Kubernetes.
Netmask could be:
- if you need to target the service mesh for access purpose: 255.255.255.248 / 0xFFFFFFF8
- if you need to address a specific IP of a server: 255.255.255.255 / 0xFFFFFFFF - servers are currently baremetal not linked to any private network ethernet card
| IP | Server | Reverse DNS | OS | Purpose | AUP |
|---|---|---|---|---|---|
| 172.27.27.28 | CloudHugger | cloudhugger.nasqueron.drake | Debian 10 | Kubernetes | Infrastructure server |
172.27.27.32/29
Development and management servers. Work by humans should always be from those servers.
Netmask could be:
- if you need to target the servers humans will use to manage the infrastructure and deploy applications: 255.255.255.248 / 0xFFFFFFF8
- if you need to address a specific IP of a server: 255.255.255.255 / 0xFFFFFFFF - servers are currently baremetal not linked to any private network ethernet card
| IP | Server | Reverse DNS | OS | Purpose | AUP |
|---|---|---|---|---|---|
| 172.27.27.33 | Ysul | ysul.nasqueron.drake | FreeBSD 12.1 | Nasqueron development server | Access for any Nasqueron or Wolfplex project |
| 172.27.27.34 | Free | ||||
| 172.27.27.35 | WindRiver | windriver.nasqueron.drake | FreeBSD 12.1 | Nasqueron development server | Access for any Nasqueron project |
172.27.27.240/29
IP range for tunnels from router-001.nasqueron.org
Netmask: 255.255.255.248 / 0xFFFFFFF8
| IP | Server | Reverse DNS | OS | Purpose | AUP |
|---|---|---|---|---|---|
| 172.27.27.252 | router-001 | - | - | Reserved for tunnel with Ysul | - |
| 172.27.27.253 | router-001 | - | - | Reserved for tunnel with CloudHugger | - |
| 172.27.27.254 | router-001 | - | - | Tinc tunnel with WindRiver (and perhaps all others?) | - |
DNS entries
| Domain | IP | Description |
|---|---|---|
| k8s.prod.nasqueron.drake | 172.27.27.28 | Advertise address for k8s cluster |
Other network ranges
Kubernetes clusters use the following network ranges:
| Cluster name | IP range | DNS domain | Use |
|---|---|---|---|
| nasqueron-k8s-prod | 10.92.0.0/12 | k8s.prod.nasqueron.local | Kubernetes services |
| nasqueron-k8s-prod-pods | 10.192.0.0/12 | None | Pods for nasqueron-k8s-prod |
Network manual
Build the network
This private network isn't trivial to build as machines are located in different datacenter cabinets, without sharing a common private physical network.
We use the following techniques to recreate those connections:
- On an hypervisor, each VM has a second network card, with a Drake IP assigned
- tunnels using ICANNnet as pipelines allow parts of Drake to be connected, with software like tinc
Configure private network card
In Template:ROPS, define a private_interface block the Drake network information for this machine.
The network unit in the core role should pick it and configure it, Template:ROPS at least for CentOS/RHEL/Rocky and FreeBSD}}.
Tinc
Tinc allows to create a mesh network and bridge the network segments.
In router mode, it only forwards IPv4 and IPv6 traffic. In switch and hub mode, it can broadcast all packets to other daemons, including in switch mode a correct Ethernet bridge with routing directly to MAC addresses.
Troubleshoot
A non IP packet doesn't pass
If the connection is managed by tinc, ensure it's configured in switch mode: in router mode, it only forwards IPv4 and IPv6 unicast packets. For linux, check this bridging reference guide.
