For the purpose of this Tutorial, this section mainly describes IPv4 flat networks as an example.
An IPv4+IPv6 double stack is one NIC with two types of IP addresses: IPv4 and IPv6, and takes full advantage of both IPv4 and IPv6. With the IPv4+IPv6 double stack, you can build different business scenarios.
Flat Network | Configurations |
---|---|
NIC | em1 |
VLAN ID | 2002 |
IP range | 192.168.2.2-192.168.2.254 |
Subnet mask | 255.255.255.0 |
Gateway | 192.168.2.1 |
DHCP IP | 192.168.2.3 |
DNS | 223.5.5.5 |
Flat Network | Configurations |
---|---|
IP range | 234e:0:4568::2-234e:0:4568:0:ffff:ffff:ffff:ffff |
Prefix length | 64 |
Gateway | 234e:0:4568::1 |
DHCP IP | 234e:0:4567::3 |
DNS | 240c::6644 |
A typical L2 flat network is a layer 2 connected network. Specifically, in a data center of a private cloud, all hosts and VM instances are on one L2 network, while the IP addresses of these hosts and VM instances are on the same L3 network. Mutual accesses between these hosts and VM instances are not routed via gateways.
L2 flat networks are preferably applied to small and medium-sized enterprises. Due to the simplicity of the network topology architecture, staff computers can reach each other directly. Computers of all staffs are on one L2 network, so network access controls usually are guaranteed by security groups (distributed firewalls) of the private cloud.
In actual deployments, gateway addresses of L3 networks must be set as gateway addresses of your company. Besides, IP addresses that are assigned to VM instances must avoid duplicating IP addresses associated to hosts with attended assignment and isolation.
The basic workflow about how to use a security group is as follows: Select an L3 network, set the corresponding security group rule, and add specified VM instances to the rule.
So far, we have introduced how to use the security group.
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