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Updating the BIOS on Lenovo laptops from Linux using a USB flash stick.Using FactoryGirl to test Padrino web applications using Padrino and Sequel.Limiting your childrens’ internet access effectively using OpenDNS.Trust over security in today’s internet.Backups with rsnaphot to external USB drives.Sending email from a dynamic IP address.SMTPd restrictions, SPF, DKIM and greylisting.DNS – make your mail server known on the internet.ISPmail tutorial for Debian Wheezy Menu Toggle.Optional: Server-based mailbox encryption.Allow user to send outoing email through Postfix.Migrating from a Stretch to a Buster server.ISPmail on Debian Buster – your mail server workshop Menu Toggle.Testing IMAP and setting up Roundcube webmail.Migrating from a Jessie to a Stretch mail server.ISPmail guide for Debian Stretch Menu Toggle.ISPmail Jessie – Postfix SMTPd restrictions.Making Postfix get its information from the MySQL database.Migrating from a Wheezy to a Jessie mail server.ISPmail guide for Debian Jessie Menu Toggle.Allow users to send outgoing email through Postfix.Making Postfix get its information from the MariaDB database.Creating a TLS encryption key and certificate.Migrating from a Buster to a Bullseye server.ISPmail guide for Debian 11 “Bullseye” Menu Toggle.Understanding LVM (logical volume manager).You may also use Wireshark capture and analysis tool. To capture all packets from a specific host on the network: Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode To capture all packets on the WAN (the below assumes that interface eth1 is the WAN interface): tcpdump relies on libcap, therefore it can produce standard pcap analysis files which may be processed by other tools. It may be used to capture packets on the fly and/or save them in a file for later analysis. Tcpdump is a network capture and analysis tool.