OPEN EPHEMERAL PORTS WINDOWS

OPEN EPHEMERAL PORTS WINDOWS

I sent a udp packet to 53162 and Windows sent back a UDP packet and ICMP port unreachableīased on Daniel's comment, it seems that the port is opened because of dns.exe. These ports showed in the terminal seem not open I'll do some checks on my own later but I also would like to hear some points related to it. For the 2,500 open udp ports, if the server sends out a UDP packet, will the system only use one of them as the ephemeral port?.Are these ports available for all NICs permanently? or if some socket is used for some service, this port is used specifically for that NIC.

But from the output, we can see that windows also provide port for that is shared for all NICs.

Usually different interfaces have different ports which means if NIC A and NIC B both have port C open, then, A's C and B's are different things.

Right now, I have the following questions: However, it doesn't have LISTENING but I guess it's open in this case. Thus, it's a socket waiting to be connected. The first *, in *:*, means connections can come from any IP address, and the second *, in *:*, means the connection can originate from any port on the remote machine. The total amount is about 2k.įrom spec 0.0.0.0 means the port is listening on all interfaces. This is just part of what my terminal showed. I had never heard of that before so I did some checking in my own environment and found out this:

Thus, if some ephemeral port is used within 2500 open UDP ports, it'll be difficult for attack to be able to know which port is used since they are all open. I chatted with one PhD student in my group and he told me that Windows has 2,500 open UDP ports.

Open ephemeral ports