Linux Networking For Beginners

Enable the telnet server, connect to the master system, and log in as different users to study remote management with telnet, noting clear text passwords and SSH as the alternative.

Disable password authentication by editing /etc/ssh/sshd_config, restarting sshd, and enforcing public/private key authentication, while understanding the effect if keys are missing and fallbacks to password authentication.

Explore how a dhcp server allocates dynamic ip addresses with lease times and distributes gateway and dns settings. Learn to install, configure, and test dhcp clients in a lab.

Configure a dhcp server by editing /etc/dhcp/dhcpd.conf, define range, subnet mask, gateway, dns servers, and domain, then start the server.

Stop dhcpd, disable it permanently, assign static addresses to all systems, and restart the network to restore the lab to its original state.

Learn to implement an NFS server on a master system, share /project with c10 and c20 via /etc/exports, enable rw access, and start the NFS server with systemctl.

Explore the NFS server export file syntax, defining shared directories, access rules, and options like rw, ro, async, sync, wdelay, hide, and root_squash, with client examples on c10 and c20.

Create 20, 50, and 100 MB files in /var/ftp/pub using dd with /dev/zero, then start and enable vsftpd, and test access from multiple clients.

Configure an ftp banner and per-directory message in an open source ftp service by editing the configuration, enabling dirmessage, restarting the service, and managing access limits.

Learn to limit download connections by configuring max_clients and max_per_ip, restart services, verify with ftp across systems, and remove restrictions when needed.

Configure ftp to use a custom anonymous directory by creating /soft and setting anon_root to /soft. Restart to apply; logs are in /var/log/xferlog and can be customized.

Practice stopping and disabling vsftpd, powering off systems, and configuring ftp server types—anonymous and local—with publish directories, upload capability, and access restrictions, including chroot jail.

Explore Samba server basics for cross-platform file sharing between Linux and Windows, configure smb.conf, align the workgroup, and install Samba packages for practical access.

Configure Samba by inspecting /etc/samba/smb.conf and backing it up to smb.conf.bak. Create a Windows share folder named test with read/write access and verify connectivity via ipconfig and ping.

Verify linux users nanu and aanya, add them as samba users, then create /project with restricted access for aanya and set up /public for guest access, configuring samba accordingly.

Configure samba by editing the global section to set workgroup, allow 127 and 172.24, share /project as writeable and browseable for aanya, then testparm and start smb and nmb.

Learn to access and mount Windows shared folders from a Linux system using smbclient and CIFS, including listing shares, authenticating with testuser, and permanently mounting via fstab.

Learn to access a Samba public folder from Windows, troubleshoot guest access blocked by security policies, enable insecure guest logons with gpedit, stop Samba services, and restore defaults.

Configure linux as a router by adding a bridged second network interface, assigning 172.24.0.1 and 192.168.0.1, enabling ip forwarding via sysctl, and verifying with ip a s.

Configure Windows and Linux lab systems with proper IP addresses, subnet masks, and gateways. Verify routing using ipconfig, ip addr, and ip route, and restart network services with ifcfg-ens33 edits.

Verify router functionality by pinging 172.24.0.10 from Windows 10. Trace the path with traceroute and tracepath, then switch Linux routing from 1 to 0 with sysctl -p.

Restore the linux networking lab to its original state by removing the ifcfg-ens38 file, dropping the extra adapter, setting ipv4_forward to 0, and resetting gateways.

Learn to install CentOS 7 on a VMware virtual machine, perform post installation settings, disable selinux and firewalld, disable NetworkManager, and review automatic partitioning.

Master Linux software package management with yum and rpm on CentOS 7, including check-update, install, update, remove, search, list, repolist and group operations like security tools.

Learn to manage Linux software with rpm commands, including querying all packages, counting installations, viewing package info, installing, updating, refreshing, erasing, and locating telnet-server, while comparing rpm options with yum.

Install Windows 10 in a VMware virtual machine, configure network settings and install required features, then complete regional, language, user, and security preferences.