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Introduction to a Self Managed Life: a 13 hour & 28 minute presentation by FUTO software
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===== Practical example: ===== <gallery mode="packed-hover" heights=250 widths=400 perrow=2> File:lu55028jxdmy_tmp_942c4249.png </gallery> * If you’re using a service like Freshdesk (CRM system): * Freshdesk needs to connect to your mail server * You don’t want to give Freshdesk VPN access * Freshdesk doesn’t have VPN access anyway * Here’s how you can handle this situation: * Add their IPs to your alias * Only those IPs will see your mail server * Everyone else gets blocked before even seeing the service * Using aliases this way means: * Your mail server is invisible to random internet traffic * Only trusted IPs can even attempt connection * Much more secure than opening ports to everyone <blockquote>'''IMPORTANT:''' While port 25 needs to be open to the world for receiving email, other mail-related ports (587, 993, etc.) should only be open to trusted IPs or VPN users.Let’s say I am making firewall rules to allow Freshdesk customer service software to access my email system. Can you imagine making a firewall rule for EACH of these individually </blockquote> Can you imagine having to add all of those IPs as its own separate rule, or having to update them all each time freshdesk’s IPs changed? That would be a nightmare! Aliases allow us to add all of these IP addresses to a single thing called ''“freshdesk IP addresses”'' – then, all we have to do is make a firewall rule with ''“freshdesk IP addresses”'' as the source or destination, rather than a bunch of rules for each individual IP. <span id="benefits-of-using-aliases"></span>
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