What is identd used for?

IDENTD operates by looking up specific TCP/IP connections and returning the user name of the process owning the connection. The Ident Protocol is designed to work as a server daemon on a user’s computer where it receives requests to a specified port, generally 113.

What is identd IRC?

In general, and in the context of IRC, ident is a method that can be used to prove that connections are valid. When the IRC server gets a connection request, it will query your system for the ident. An ident server can read the ident file and send this ident back to the IRC server.

What is port 113 TCP?

Port 113 used for Identification/Authorization service. When a client program on your end contacts a remote server for services such as POP, IMAP, SMTP, IRC, FTP, etc.

What is ident in firewall?

The Ident Protocol (Identification Protocol, Ident), specified in RFC 1413, is an Internet protocol that helps identify the user of a particular TCP connection.

What is identd in Linux?

Identd is a server which implements the TCP/IP proposed standard IDENT user identification protocol as specified in the RFC 1413 document. identd operates by looking up specific TCP/IP connections and returning the user name of the process owning the connection.

Should I block port 113?

The good news is that since IDENT is almost never used, simple “hard stealthing” of port 113, which is available from all personal firewalls, is probably sufficient. It will allow your system to remain completely invisible on the Internet and will almost certainly never cause any connection trouble.

What ports should I block on my router?

For example, the SANS Institute recommends blocking outbound traffic that uses the following ports:

  • MS RPC – TCP & UDP port 135.
  • NetBIOS/IP – TCP & UDP ports 137-139.
  • SMB/IP – TCP port 445.
  • Trivial File Transfer Protocol (TFTP) – UDP port 69.
  • Syslog – UDP port 514.

What is an ident server?

The ident protocol is an Internet protocol that identifies the user of a particular TCP connection. It works as a server daemon on a user’s computer where it receives requests to a specified TCP port.

What ports should never be open?

Here are some common vulnerable ports you need to know.

  • FTP (20, 21) FTP stands for File Transfer Protocol.
  • SSH (22) SSH stands for Secure Shell.
  • SMB (139, 137, 445) SMB stands for Server Message Block.
  • DNS (53) DNS stands for Domain Name System.
  • HTTP / HTTPS (443, 80, 8080, 8443)
  • Telnet (23)
  • SMTP (25)
  • TFTP (69)

What ports should always be closed?