Networking Service

Infrastructure

• each server is connected to two top of the rack switches by 2x10G
• connections are configured as redundant, active/active Layer 2 & 3 Setup (MLAG/VARP)
• we make heavy usage of VLANs to seperate customer segements
• all our servers and services are reachable by IPv4 and IPv6. Details are available at Dualstack IPv4/IPv6.

Configuration

• all servers are setup with sane defaults, usually you dont have to worry about network configuration
• for special cases, you can add the following settings

# Network Configuration
networking::interfaces:
  "eth0":
    "address":           "99"
    "address_prefix_v4": "192.168.0"
    "netmask_v4":        "255.255.255.0"
    "gateway_v4":        "192.168.0.1"
    "address_prefix_v6": "2001:db8::"
    "netmask_v6":        "64"
    "gateway_v6":        "2001:db8::1"

• this will led to the following Network Configuration

auto eth0
    iface eth0 inet static
    address 192.168.0.99
    netmask 255.255.255.0
    gateway 192.168.0.1

    iface   eth0 inet6 static
    address 2001:db8::99
    netmask 64
    gateway 2001:db8::1

• usually, you only have to configure the “address” parameter. All other settings should get the appropriate value trough inheritance
• by replacing eth0 with ethX, you can add additional interfaces in the same or other subnets
• as both IPv4 and IPv6 is configured manually, we disable IPv6 autoconf and router advertisement