A site-to-site VPN is usually best when two networks need ongoing communication, such as a branch, plant or remote cabinet connecting to a central office. The routers maintain the tunnel automatically and devices can communicate according to fixed firewall rules without each user starting a VPN client.
Individual remote-access accounts are better for people who need temporary or personal access from different locations. They allow user-level credentials and easier revocation, but may be cumbersome for machine-to-machine traffic. Many deployments use both: a site-to-site tunnel for core systems and individual access for support staff. The design should minimise what each tunnel can reach and account for changing cellular public IPs or carrier-grade NAT.
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When should a site use a site-to-site VPN rather than individual remote-access VPN accounts?
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