Forward these ports to the IP address that is assigned to the external interface of your VPN server. If you're routing traffic inbound and performing NAT at or behind the VPN server, then you must open your firewall rules to allow UDP ports 500 and 4500 inbound to the external IP address applied to the public interface on the VPN server.
Make sure to open that port up in your firewall if you are allowing zone transfers from your DNS server. Knowing that sooner could have saved me a lot of time! So for future reference: Incoming open ports: TCP/53 UDP/53. Outgoing open ports: TCP/53 UDP/53 TCP/1024-65535 UDP/1024-65535 Allow Both TCP and UDP Port 53 to Your DNS Servers If the organization's firewall protecting the authoritative DNS server allowed the TCP port 53 packets and the DNS server was configured to allow zone transfers to anyone, then this dig command windows server 2008 - DNS.EXE allocates 5000+ ports This command clears all open UDP ports by DNS.EXE. net stop dns After restarting the DNS service, DNS.EXE allocates 5000+ ports. net start dns It doesn't consume extensive memory or cpu. However I noticed/alarmed many http/smtp/pop3 connection problems to the server because of timeouts. Configure DNS and Firewall Settings | Microsoft Docs Forward these ports to the IP address that is assigned to the external interface of your VPN server. If you're routing traffic inbound and performing NAT at or behind the VPN server, then you must open your firewall rules to allow UDP ports 500 and 4500 inbound to the external IP address applied to the public interface on the VPN server.
May 27, 2020
Here is a list of ports that are used commonly on ISPConfig 3 servers. If you don't have all services installed or if you e.g. don't want to connect to MySQL from external servers, then close the unused or unwanted ports. TCP ports. 20 - FTP Data 21 - FTP Command 22 - SSH 25 - Email 53 - DNS 80 - HTTP (Webserver) 110 - POP3 (Email) 143 -Imap How to open DNS port 53 using ufw on Ubuntu/Debian Linux
Follow the steps below to optimize your connection, Open NAT and reduce lag and ping for Apex Legends using a VPN: Get PureVPN’s Port Forwarding add-on Select “Block all ports but enable
May 27, 2020 Public DNS | Google Developers The Domain Name System (DNS) protocol is an important part of the web's infrastructure, serving as the Internet's phone book: every time you visit a website, your computer performs a DNS lookup. Complex pages often require multiple DNS lookups before they start loading, so your computer may be performing hundreds of lookups a day. Configure Windows Firewall - SQL Server | Microsoft Docs Dec 13, 2019 dns - What ports need to be open on a firewall to access These ports alone aren't actually working for me (nice iptables config though). Nevermind SSH (that ones nice and simple, I already have that set up) as you said I allowed all ICMP for ping. And thanks to this I can now ping my DNS server directly. However ping google.com does not work with this configuration.