2005年9月29日 · DNS port 53 (udp) is for a client to query a server. This is the standard method of pulling down a single query from a DNS server and is by far the most commonly used form of DNS DNS port 53 (tcp) is used for server-to-server communications (typ) when one server is requesting a zone transfer of the entire zone.

2003年3月12日 · TFTP works like this: the client issues the first packet using udp port grater than 1023 to port 69 on the server. The server responds using a port number grater than 1023 to the original port used by the client. The rest of the conversation is …

2013年7月5日 · Zones are seperated by a Checkpoint FW. When I generate a tftp traffic to copy running config to the tftp server from the ASAs, the Checkpoint show a redam port number like 33442 somthing, instead a UDP 69. Can any of you tell me why it is not 69? The configuration on the ASAs regarding for the traffic are default. thanks, Han

UDP Port 69 refers to Trivial File Transfer Protocol (TFTP), a file transfer protocol (FTP), implemented on User Datagram Protocol (UDP), that uses a very small amount of memory, so it was used to ...

2020年2月10日 · Phones use this port to download a secure configuration file from TFTP. Phone. Unified Communications Manager. 8080 / TCP. Phone URLs for XML applications, authentication, directories, services, etc. You can configure these ports on a per-service basis. Phone. Unified Communications Manager. 9443 / TCP. Phone use this port for authenticated ...

2007年6月14日 · If you desire to block TFTP, then why not block both TCP and UDP on port 69. Any TCP connection on well known Port 69 would smell like a bad guy or other mal-intender. Port 69 used to be a big screen door to hackers years ago, might still have a few listeners floating around today. Bill

2005年9月7日 · TFTP works like that, the first packet from the Client to the server (in your case from a switch to the tftp server) has a source port greater then 1023 (>1023) and a destination port of 69. The subsequent packets, also the ones coming from the tftp server back to the switch, will use a source port > 1023, and also a destinaton port >1023.

Port 69 and UDP are used for tftp transmissions. What port number does the TFTP server use to accept request from client? By default a TFTP server will accept connection requests on UDP port 69.

2010年11月1日 · 1) Client initiate the session using UDP flow to port 69 from a random port, lets say X. 2) server replies with data, opening a new UDP flow towards the client. Server's source port is random, while destination port for this response is X .

2019年8月5日 · Hi, TFTP uses UDP port 69 to establish network connections. However, the data transfer ports (i.e. Ephemeral Ports) are selected dynamically by the sender and receiver when the connection is initialized.