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High latency localhost scanning (Nmap 6.49BETA1) #153
I've noticed some very high latency differences between version 6.47 and version 6.49BETA1 for atleast one specific scan type. The affected scan in question was:
The scans completes in approx 8 secs in version 6.47 but in excess of 15-minutes in the new Beta.
I am not able to reproduce this on Kali 1.1.0.
root@demeter:~/tools/nmap# nmap -V
root@demeter:~/tools/nmap# nmap -A -p- 127.0.0.1
root@demeter:~/tools/nmap# 2015-06-11/nmap-6.49BETA1/nmap -V
root@demeter:~/tools/nmap/2015-06-11/nmap-6.49BETA1# ./nmap -A -p- 127.0.0.1
When you run these commands in order, which is the first one that produces the delay?
Also, please include your Linux kernel version (output of
It looks as though number 2 is the first one to produce the delay:
Running number 2 with Nmap 6.47 = 0.10 sec scan time
I can also replicate on another build (to a lesser extent):