Reputation
2,426
Top tag
Next privilege 2,500 Rep.
Create tag synonyms
Badges
4 16
Newest
 Nice Answer
Impact
~204k people reached

Aug
25
comment Is there a reliable way to detect OS of the network hosts from linux workstation?
If you use a recent version of Nmap then it is very unlikely it will not have a fingerprint. If it does not, you can submit one and we'll add it.
Jul
7
answered How to interpret nmap result, host up but no ports open
May
20
comment Why does nmap send two packets in order to test a single port
@Matka Yes, that exactly matches what I'd expect to see from this bug. You can try compiling from source yourself, since our included libpcap seems to be unaffected.
May
19
answered Why does nmap send two packets in order to test a single port
Apr
23
awarded  Nice Answer
Apr
9
comment One device shows down when more than 160 ip addresses are scanned with nmap
Are you using a gigabit switch by any chance? ARP requests (like Nmap uses) are sent broadcast, and if the printer is only capable of 100Mbps, the switch could be dropping some traffic to that port. This is just a guess; does the problem go away if you add --scan-delay 0.1s?
Mar
12
awarded  Nice Answer
Mar
4
answered Is there a way to see what is actually filtering TCP port communication?
Feb
28
awarded  Yearling
Feb
18
comment nmap results to find open ports for SIP
Check output of netstat on both endpoints. Do you expect 5060/tcp or 5060/udp? You have only scanned TCP.
Jan
29
answered Can a port be in the listen state and be closed?
Jan
29
revised Can a port be in the listen state and be closed?
formatting
Jan
3
awarded  Revival
Dec
1
answered nmap: why is it scanning port 80 with TCP ACK and not SYN?
Oct
10
answered nmap repeats the scan to a specific port multiple time
Sep
30
awarded  Explainer
Apr
30
answered port 25 is reported to be open but no service is listening
Apr
4
comment Nmap: find free IPs from the range
@Grant Nmap's host discovery scan (sometimes called "ping scan") sends lots of different probes, not just ICMP Echo Requests. For addresses on the same data link, it uses ARP requests, which are basically impossible to ignore.
Apr
4
comment Nmap: find free IPs from the range
When run with root privilege, Nmap simply does the ARP request and reports addresses that respond.
Apr
4
answered Nmap: find free IPs from the range