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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
Apr
1
answered Force stop upstart job
Mar
20
comment DDOS using ntp server
Security folks can use Nmap's ntp-monlist script to find offenders on IP addresses they own. An ISP can check its own AS with this command: nmap -sU -p123 --script ntp-monlist,targets-asn --script-args targets-asn.asn=1234,newtargets --open -oA ntp-results
Mar
20
answered Why is this upstart script not stopping my process?
Mar
7
comment Is there a device with multi auxiliary (AUX) ports to configure multiple devices
What kind of AUX port? RS-232?