1. **Source IP Address for SSH Connections**:
- **Old Way**: Changing the source IP address for SSH connections on the router (R1) often involved manually configuring the source IP to be different from the default outgoing interface address.
- **New Way**: Network devices can now more easily manage SSH source IP addresses using configuration options that allow specifying the source IP directly in the SSH command or through advanced configuration tools. Additionally, modern management platforms might offer more intuitive ways to test and validate connectivity.
2. **RSA Key Requirements**:
- **Old Way**: To use SSHv2, RSA keys of at least 768 bits were required. If no keys were present, they needed to be generated, and hostname and domain name had to be configured first.
- **New Way**: While RSA keys are still used, there is a strong shift towards using stronger key sizes and algorithms. Modern best practices recommend using RSA keys of at least 2048 bits or using elliptic curve keys for better security. The generation of keys often integrates with automated scripts or management platforms that simplify the process. Hostname and domain name configuration remains necessary for key generation, but these steps are now often streamlined or managed through centralized systems.
3. **General SSH Configuration**:
- **Old Way**: Basic SSH configurations were handled through CLI commands, and manual verification was needed to ensure proper setup.
- **New Way**: Modern network configurations often use automated tools and centralized management systems to configure and test SSH access. This includes integrating SSH setup with security policies, ensuring compliance with best practices, and leveraging advanced features like secure key storage and automated updates.
Overall, while the foundational steps remain similar, modern practices emphasize stronger security measures, more intuitive configuration management, and integration with advanced network management tools.
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