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Figure: A customer can subdivide a Virtual Private Cloud with subnets.
- Traffic to and from a subnet can be controlled by Access Control Lists (ACLs)
- A Security Group (SG) can control the traffic at the VSI level
- Set up a public gateway for access to the internet
This glossary provides definitions and descriptions of ACLs and SGs, and the actions you can perform with them. The sectio nthat follows descibes
An Access Control List (ACL) can manage (that is, it can allow or deny) ingress and egress traffic for a subnet. An ACL is stateless, which means that ingress and egress rules must be specified separately and explicitly. Each ACL consists of rules, based upon a source IP, source port, destination IP, destination port, and protocol.
In IBM Cloud VPC, every subnet is created with a default ACL, which allows inbound and outbound traffic, but customers can create custom ACLs. Only one ACL is attached to a subnet at any time, but one ACL can be attached to multiple subnets. For more information about how to use ACLs during the Beta release, please see our ACL guide.
Available User Actions
- List all Subnets and see ACL associations
- List all ACLs
- List all rules in certain ACLs (Ingress + egress categories)
- CRUD (Create, Read, Update, Delete) the ACL
- Charges up to 25 ingress and egress rules are free (All rules are free during Beta release.)
A security group acts as a virtual firewall that controls the traffic for one or more servers (VSIs). A security group is a collection of 5-tuple rules that specify whether to allow traffic for an associated VSI.
When a customer launches a VSI, he or she can associate one or more security groups with that VSI. Given the correct permissions, customers can modify security group rules using the IBM Console, the CLI, or the API.
Available User Actions
- List all security groups (SG)
- List the server's SG associations
- List all SG rules and associations on a specific SG
- List all rules in certain SG (Ingress + egress categories)
- CRUD (Create, Read, Update, Delete) the SG
- Specify "allow" actions
For more information about how to create a VSI that uses security groups, and more about the limitations of security groups during the Beta release, please refer to our security groups guide.
Although IBM Cloud VPC does not provide end-to-end encryption, it allows for it. For example, if you have a secure endpoint on a virtual server (for example, an HTTPS server on Port 443), you can attach a floating IP to that server, and then your connection is end-to-end encrypted from the client to the server on Port 443. Nothing in the path forces a decryption.
Note, however, that if you use an insecure protocol such as HTTP on Port 80, your data is in the clear from end to end.