Which statement best describes VPN via SSH and PPP in the notes?

Which statement best describes VPN via SSH and PPP in the notes?

• A. Works well with dynamic IP addresses
• B. Requires fixed IP addresses
• C. SSH tunnels PPP after PPP
• D. VPN via SSH and PPP is not viable in kernels

Answer: (A)

VPN built with SSH and PPP hinges on the SSH channel providing a secure, stable transport to a known server, while PPP handles the IP layer inside that tunnel. Because the connection goes to a fixed SSH server, the external IP of the client can change without breaking the VPN—the endpoint remains reachable via its hostname or dynamic DNS, which is why this approach works well with dynamic IP addresses. PPP negotiates and assigns internal IP addresses over the tunnel, so the client’s changing public address doesn’t disrupt the VPN’s internal addressing. The idea that SSH tunnels PPP after PPP isn’t accurate—the PPP session runs inside the SSH tunnel, not after it. And the notion that VPN via SSH and PPP isn’t viable in kernels isn’t correct either; this configuration can be implemented in user space (for example, with ssh and pppd) without needing kernel VPN support.

VPN built with SSH and PPP hinges on the SSH channel providing a secure, stable transport to a known server, while PPP handles the IP layer inside that tunnel. Because the connection goes to a fixed SSH server, the external IP of the client can change without breaking the VPN—the endpoint remains reachable via its hostname or dynamic DNS, which is why this approach works well with dynamic IP addresses. PPP negotiates and assigns internal IP addresses over the tunnel, so the client’s changing public address doesn’t disrupt the VPN’s internal addressing. The idea that SSH tunnels PPP after PPP isn’t accurate—the PPP session runs inside the SSH tunnel, not after it. And the notion that VPN via SSH and PPP isn’t viable in kernels isn’t correct either; this configuration can be implemented in user space (for example, with ssh and pppd) without needing kernel VPN support.