You have created virtual machines in the Google Cloud using compute engine. Now the important thing is how they can communicate with the external world? Virtual machines can communicate with external world using networks.
Compute Engine Network:
Compute Engine Network:
- You have to create network so that VM instances can communicate with external world.
- Network is required to communicate with the persistent disks as well , because they are hosted external to the VM instance.
- VM Instances provides bandwidth based on CPU core. It means, if your VM instance has more cores than it will be having more bandwidth.
- Currently bandwidth per core is 2 GB/S.
- In a Project you can create multiple networks. Each network can have multiple VMs. However, each VM can be attached to only one network (It means VM are single Homed)
- If you want to have multi-homed VM instances, you can get it using IP forwarding.
Compute Engine Network Firewall :
- Firewall is integrated with the compute engine network.
- There are some default rules which allows small traffic to reach VM instance.
- Like you can have any two instances in network can communicate with each other.
- ICMP, RDP and SSH protocol are supported so that any source from external network can reach to the instance.
- If you want any other traffic to reach your instance, you have to explicitly define the rules.
- No ingress HTTP traffic is allowed to reach the instance by default.
- You can configure that firewall rules can be applied to single VM in a network or all the VMs in a network.
- Firewall can filter only ingress traffic.
- All the outgoing traffic should be filtered using route table.
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