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List: nmap-dev
Subject: negative latencies?
From: nestmp () mntk ! org
Date: 2013-10-22 0:42:46
Message-ID: 1382402566.6316.36837085.1B9853AC () webmail ! messagingengine ! com
[Download RAW message or body]
Hi - while scanning a fast network (95+% hosts repond <3ms),
using -T5, I see many reports like (tech detail at bottom):
Nmap scan report for W.X.Y.Z
Host is up (-0.90s latency).
PORT STATE SERVICE VERSION
22/tcp filtered ssh
23/tcp filtered telnet
[...]
or
Nmap scan report for A.B.C.D
Host is up (-2.0s latency).
Skipping host 171.64.214.144 due to host timeout
Nmap scan report for I.J.K.L
Host is up (-2.0s latency).
PORT STATE SERVICE VERSION
22/tcp filtered ssh
23/tcp filtered telnet
Note the negative latencies. Our network isn't that fast!
Searching for 'negative latency' (and similar) brings up no hits I can
find. Apologies if a duplicate/not a bug.
Thanks,
- m
[tech details]
nmap 6.4
/usr/local/bin/nmap -n --randomize-hosts -PE -PS22,23,80,433 -sS -p
22,23,80,137,443,445,8000,8008,8080 -sV --version-all -O --osscan-guess
-T5 --max-rtt-timeout 100ms --initial-rtt-timeout 4ms --min-parallelism
8 --min-hostgroup 1024 --stats-every 600s -sC -oA 'nmap_%D_%T'
INSERT_CLASS_B_HERE
# uname -a
Linux scanner 3.2.0-54-generic-pae #82-Ubuntu SMP Tue Sep 10 20:29:22
UTC 2013 i686 i686 i386 GNU/Linux
# cat /etc/issue
Ubuntu 12.04.3 LTS \n \l
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