2nd October 2019

akamai

15

What is on port 123?

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NTP is a widely deployed time synchronization service listening on UDP port 123. The attacker spoofs source IPs and sends a small query to a vulnerable NTP server, which generates a large reply of response data to the spoofed addresses.

What is NTP protocol?

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.

What is the port for NTP?

OpenNTPD also uses high-numbered source ports so if it is able to synchronize but ntpd is not, it is very probable that the incoming UDP port 123 is blocked. If you're going to run ntpd , you need to fix your network/firewall/NAT so that ntpd can have full unrestricted access to UDP port 123 in both directions.

1

What is port 23 used for?

Typically, this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23, where a Telnet server application (telnetd) is listening. Telnet, however, predates TCP/IP and was originally run over Network Control Program (NCP) protocols.

2

What is Port 3389?

By default, the server listens on TCP port 3389 and UDP port 3389. Microsoft currently refers to their official RDP client software as Remote Desktop Connection, formerly "Terminal Services Client". The protocol is an extension of the ITU-T T.128 application sharing protocol.

3

What is the port 23?

23, tcp, udp, telnet protocol unencrypted text communications, official in tcp ip and udp networks, a port is an endpoint to a logical connection and the way a client program specifies a specific server program on a computer in a network. The port number identifies what type of it is.

4

What is port 137 used for?

The Windows 2000 implementation of NetBIOS over TCP/IP is referred to as NetBT. NetBT uses the following TCP and UDP ports: UDP port 137 (name services) UDP port 138 (datagram services)

5

Is FTP a TCP or UDP protocol?

FTP itself uses the TCP transport protocol exclusively, or in other words, it never uses UDP for its transport needs. Typically an application layer protocol will use one or the other. One notable exception to that is DNS or Domain Name System. FTP also is odd in the fact that it uses two ports to accomplish its task.

6

What is the port of ping?

'ping' uses ICMP, specifically ICMP echo request and ICMP echo reply packets. There is no 'port' associated with ICMP. Ports are associated with the two IP transport layer protocols, TCP and UDP. ICMP packets are identified by the 'protocol' field in the IP datagram header.

7

What is port 135 used for?

Remote Procedure Call (RPC) port 135 is used in client/server applications (might be on a single machine) such as Exchange clients, the recently exploited messenger service, as well as other Windows NT/2K/XP software. The service uses all the following ports: 135/tcp, 135/udp, 137/udp 138/udp, 139/tcp, 445/tcp.

8

What is the use of 8080 port?

If you have an own web server running, then it runs on port 80. Port 8080 is a place to host a secondary or alternate web server. It is commonly used for proxy and caching.

9

Which port is used for SNMP?

SNMP-TRAP allows the agent to send information about itself to the manager on port UDP/162. TCP can be used for both 161/162, but UDP tends to be more common. Typically the agents are configured in read-only or read-write mode.

10

Is SSH a TCP or UDP?

So, SSH needs port 22/tcp. You're asking if opening 22/tcp and 22/udp presents a security vulnerability. The answer is "no" if nothing is listening to 22/udp.

11

What is difference between TCP and UDP?

There are two types of Internet Protocol (IP) traffic. They are TCP or Transmission Control Protocol and UDP or User Datagram Protocol. TCP is connection oriented – once a connection is established, data can be sent bidirectional. UDP is a simpler, connectionless Internet protocol.

12

What is the port 20?

Purpose: File Transfer Protocol (Default Data Channel) Description: The FTP protocol uses a pair of connections between the FTP client and FTP server. The connection with the FTP server's port 20 is the second connection created during an FTP session, the first one being to the server's port 21.

13

Is DNS a TCP or UDP?

The reality is that DNS queries can also use TCP port 53 if UDP port 53 is not accepted. Now with the impending deployment of DNSSEC and the eventual addition of IPv6 we will need to allow our firewalls for forward both TCP and UDP port 53 packets.

14

What is the port number for NTP?

SNTP is a reduced version of the NTP protocol that can be used to replace TIME clients. NTP is a far more sophisticated protocol created by Dave Mills. NTP is implemented via UDP over port 123, and can operate in broadcast and multicast modes, or by direct queries.

15

What is a port number used for?

A port number is a way to identify a specific process to which an Internet or other network message is to be forwarded when it arrives at a server. For the Transmission Control Protocol and the User Datagram Protocol, a port number is a 16-bit integer that is put in the header appended to a message unit.

16

Is HTTP a TCP or UDP?

HTTPS can run over any reliable stream transport protocol. Normally that's TCP, but it could also be SCTP. It is NOT expected to run over UDP, which is an unreliable datagram protocol (in fact, while that's not its official name, that's a good way to remember what it is).

17

What is the port of SNMP?

The SNMP agent receives requests on UDP port 161. The manager may send requests from any available source port to port 161 in the agent. The agent response is sent back to the source port on the manager. The manager receives notifications (Traps and InformRequests) on port 162.

18

What are the ports?

1) On computer and telecommunication devices, a port (noun) is generally a specific place for being physically connected to some other device, usually with a socket and plug of some kind. Typically, a personal computer is provided with one or more serial ports and usually one parallel port.

19

What is the use of port 21?

File Transfer Protocol (FTP) is one of the oldest Internet protocols. FTP servers open their machine's port 21 and listen for incoming client connections. FTP clients connect to port 21 of remote FTP servers to initiate file transfer operations.

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