Port 53 not listening? I had pi-hole working perfectly, then i enabled DHCP on my Pi (couldnt change the DNS DHCP settings on my verizon router) DHPC is working fine, and i can access the mgmt gui just fine (port 80) but dns isn't working.

As we witnessed with the dhcpserver port on Felix, certain open UDP services can hide even from Nmap version detection. He has also only scanned the default ports so far, there are 64529 others that could possibly be open. For the record, 53 is the only open UDP port on Scanme. 2. Port 53: Port 53 is used by DNS. Let’s see one DNS packet capture. Here 192.168.1.6 is trying to send DNS query. So destination port should be port 53. Now we put “udp.port == 53” as Wireshark filter and see only packets where port is 53. 3. Port 443: Port 443 is used by HTTPS. Let’s see one HTTPS packet capture. DNS primarily uses the User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. When the length of the answer exceeds 512 bytes and both client and server support EDNS, larger UDP packets are used. Guaranteed communication over port 53 is the key difference between TCP and UDP. UDP port 53 would not have guaranteed communication in the same way as TCP. Because protocol TCP port 53 was flagged as a virus (colored red) does not mean that a virus is using port 53, but that a Trojan or Virus has used this port in the past to communicate. Jun 30, 2020 · ALLOW TCP/UDP IN/OUT to 208.67.222.222 or 208.67.220.220 on Port 53. and. BLOCK TCP/UDP IN/OUT all IP addresses on Port 53 The first rule trumps the second rule. Put simply, any requests to OpenDNS will be allowed and any requests to any other IP will be blocked. Oct 10, 2018 · This check udp port article will talk about the User Datagram Protocol, what is used for and the tool to use it. User Datagram Protocol (UDP) is like a send and forget protocol. To check if the UDP port is open or not, you should receive a response from the port.

Port scan failing for UDP 53 and UDP 123 Post by EFlores » Sat Jan 17, 2015 5:17 pm Every time I run the port scan for basic scan UDP 53 fails and when I run the advanced scan UDP 123 fails, does anyone know what to do to avoid this and if this would be the reason why my ooma calls are not very good lately. please advice if you know.

Oct 31, 2009 · DNS uses UDP for DNS Queries over Port: 53. A client computer will always send a DNS Query using UDP Protocol over Port 53. If a client computer does not get response from a DNS Server, it must re-transmit the DNS Query using the TCP after 3-5 seconds of interval.

DNS primarily uses the User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. When the length of the answer exceeds 512 bytes and both client and server support EDNS, larger UDP packets are used.

Apr 21, 2010 · It's UDP Port 53 you need to look for, you would expect to see: UDP IPAddress:53 *:* UDP 127.0.0.1:53 *:* Or an entry for each address. TCP is used for Zone Transfers and little else, you don't need your DNS Server to listen for that. UDP is used for standard queries. Port 53 is extremely sub-optimal for OpenVPN. Some providers block access to external DNS (UDP port 53). I’m sitting on a hotel network now where that is the case. Port scan failing for UDP 53 and UDP 123 Post by EFlores » Sat Jan 17, 2015 5:17 pm Every time I run the port scan for basic scan UDP 53 fails and when I run the advanced scan UDP 123 fails, does anyone know what to do to avoid this and if this would be the reason why my ooma calls are not very good lately. please advice if you know. Oct 04, 2015 · With that said, I looked at my iptables config and both tcp and udp on port 53 are allowed by default with whm/cpanel. All good there. My edge device, however, is not allowing tcp. I have these firewall rules in place at the moment : outbound dns internal:any > any:53 udp inbound dns1 any:any > (ip of nameserver1):53 udp Port 53 not listening? I had pi-hole working perfectly, then i enabled DHCP on my Pi (couldnt change the DNS DHCP settings on my verizon router) DHPC is working fine, and i can access the mgmt gui just fine (port 80) but dns isn't working.