One of the types of additional IP address ranges available for order at Cherry Servers is „Gateway“ type IP range. „Gateway“ type IP range uses the same routing principles as does „Dedicated IP“ address. However, there are some important details to know when ordering „Gateway“ IP range.
- „Gateway“ IP ranges come in minimum /29 (which is 8 IP addresses) and then incrementing by doubling in size /29 (8 IP) → /28 (16 IP) → /27 (32 IP) and so on.
- „Gateway“ IP range uses up 3 IP addresses from it’s range (no matter which size) for network configuration as follow: 1 x Network IP, 1 x Gateway IP, 1 x Broadcast IP. Meaning that they will not be available for use with server applications.
- IP addresses of this type are not easily movable between servers as it matter on which module in Cherry Servers DC they reside. Which may mean that after assigning one of the available IP addresses to one server the client will not be able to assign other available IP addresses to another server due to the second server being located in a different module.
We have 203.0.113.0/29 additional “Gateway” IP range (8 IP addresses). This is how IP address usage would be configured:
203.0.113.0 – Network IP address (unusable for services)
203.0.113.1 – Gateway IP address (unusable for services)
203.0.113.2, 203.0.113.3, 203.0.113.4, 203.0.113.5, 203.0.113.6 – Host IP (usable on system)
203.0.113.7 – Broadcast IP address (unusable for services).
Which means 5 IP address for us with system.
Network, gateway and broadcast IP addresses are essential to “Gateway” IP routing so with each individual ordered range they must be dedicated. Therefore, it may appear that even though you ordered /29 (8 IP addresses) you get to use 5. It is important to understand that 3 IP addresses are configured for routing purposes.
Now in addition to “Dedicated IP address” you configure your additional IP range. When your server applications will use source address from your additional IP range, they will contact gateway IP of the range and not of the “Dedicated IP”.