Fritzbox telnet deletebyindex6/11/2023 ![]() ![]() We are testing the mailserver with: telnet 143 and telnet 42.8.5.2 143įirewall tells us: connection (TCP) establishedīut if we test with telnet from different WAN-line or by LTE we cannot always connect with telnet. Ping domain from inside our LAN = IP is 10.2.1.100 That means: ping domain from outside our LAN = IP is 42.8.5.2 ![]() Internal IP of mailserver: 10.2.1.100 (changed for example)ĭNS-name of mailserver (split DNS): Mail can be received and sent by SMTP (25) to the outside world.Ĭlients can fetch and send email by IMAP (143)and SMTP (587) from all LAN interfaces.īut #1: clients cannot fetch and send email from outside our LAN.īut #2: Sometimes it works from outside our LAN.Įxternal IP of mailserver: 42.8.5.2 (changed for example) NAT of ports 25 (SMTP), 143 (IMAP with StartSSL), 587 (Submission with StartSSL). Mailserver with fixed IP over OpenVPN-Client-DialIn to an IP-Provider. Problem (configuration details see below): With opnsense everything works as it should - besides a nasty problem with our mailserver. With pfsense (a nice firewall solution as well) we did many times crash our configuration without any clue, why this happened. First of all I want to say, that opnsense is a really nice and reliable firewall solution.Īfter having a steep learning curve we now got very reliable results in comparison to pfsense.
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