What is portmapper used for?

A port mapper is the protocol that maps the number or version of an Open Network Computing Remote Procedure Call (ONC RPC) program to a port used for networking by that version of the program.

What is open Portmapper?

An “open portmapper server” is a server running portmapper, but is accessible for everyone on the internet. If the service is left open it could be used to amplify DDoS attacks.

What Rpcbind 111?

“Portmapper is an RPC service, which always listens on tcp and udp 111, and is used to map other RPC services (such as nfs, nlockmgr, quotad, mountd, etc.) to their corresponding port number on the server. …

What would a client need to know if there was no portmapper?

If a server is not registered with a portmapper, you must assign a TCP port number to that server. Your clients will not know where to find your AR System server because the port might be different if the AR System server is restarted.

What port is portmapper?

port 111
Portmapper and rpcbind use well-known port 111. See Well-known port assignments, for other well-known TCP and UDP port assignments. The port-to-program information maintained by portmapper is called the portmap. Clients ask portmapper or rpcbind about entries for servers on the network.

What is the use of port 135?

Port 135 is used by Messenger Service (not MSN Messenger) and exploited in popup net send messenger spam [MSKB 330904]. To stop the popups you’d need to filter port 135 at the firewall level or stop the messenger service. The service uses all the following ports: 135/tcp, 135/udp, 137/udp 138/udp, 139/tcp, 445/tcp.

What is port 8080 typically used for?

The most commonly used example is assigning port 8080 for a web server. To get traffic to this web server, you would need to append the port number to the end of the domain name like http://websitename.com:8080. Note that using port 8080 is not reserved for secondary web servers.

What is the use of RPC ports?

By default, RPC uses ports in the ephemeral port range (1024-5000) when it assigns ports to RPC applications that have to listen on a TCP endpoint. This behavior can make restricting access to these ports challenging for network administrators.