New answers tagged

0

Nmap by default uses a slow algorithm for scanning UDP ports because it wants to be able to report all open or potentially open ports. A service listening on a UDP port is not obligated to respond to any arbitrary datagram. Instead, it usually only responds to correctly-formed application protocol datagrams. A probe sent to a closed port, however, will get ...


1

First of all you can use the -T5 parameter on nmap, which is the fastest rate possible. By default, nmap uses -T4. Still you won't get as quick results as you would with masscan. According to the creator's github: This is an Internet-scale port scanner. It can scan the entire Internet in under 6 minutes, transmitting 10 million packets per second, from a ...


0

The main reason for been slow is because the nature of UDP, this means that in order to know if a port with UDP is close is by using timeouts or by received ICMP unreach packets. I dont think you can speed up the UDP scans, may be there is timeout values and tries that you can play with, but basically is a problem of how the UDP protocol works.


1

nmap tests with uncommon kinds of email address specification where it explicitly tries to bypass filtering. mxtoolbox instead just checks with the common kind of address. Still, both only check the result of RCPT TO. While a failure at this stage indicates that the address is not accepted, it will still be possible to reject the mail at a later stage of ...


Top 50 recent answers are included