nmap won't recognize a hostname on my local area network

Scanning the machine on the LAN with my laptop, I got this:

gabriele @ osiris { ~ } [ Tue Oct 07 ] [ 08:49 PM]

 nmap -sP 192.168.1.236



Starting Nmap 6.40 ( http://nmap.org ) at 2014-10-07 20:50 CEST

Nmap scan report for ---.homenet.telecomitalia.it (192.168.1.236)

Host is up (0.0044s latency).

Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds

nmap won't recognize the nostname, putting—in place of "mercury" and I assume is not a problem of nmap because it doesn't even access in this way:

root@mercury

when I changed the hostname I follow these steps

sudo nano /etc/hostname

and I wrote a single line with "mercury", then:

sudo nano /etc/hosts

with this configuration:

127.0.0.1       localhost

127.0.1.1       mercury localhost

::1             localhost ip6-localhost ip6-loopback

fe00::0         ip6-localnet

ff00::0         ip6-mcastprefix

ff02::1         ip6-allnodes

ff02::2         ip6-allrouters

and finally:

sudo /etc/init.d/hostname.sh start

am I doing something wrong?

edited Oct 7 '14 at 20:48

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

bumped to the homepage by Community♦ 33 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

That's probably the result of the reverse DNS lookup. What does host 192.168.1.236 print?

– Martin von Wittich
Oct 7 '14 at 19:07

236.1.168.192.in-addr.arpa domain name pointer ---.homenet.telecomitalia.it.

– Gabriele Salvatori
Oct 7 '14 at 19:10

Yep, it looks like the ---.homenet.telecomitalia.it is coming from your DNS server. If that is your local router provided by your ISP, have a look in the web interface - there could be a way to rename that entry.

– Martin von Wittich
Oct 7 '14 at 21:18

add a comment |

Scanning the machine on the LAN with my laptop, I got this:

gabriele @ osiris { ~ } [ Tue Oct 07 ] [ 08:49 PM]

 nmap -sP 192.168.1.236



Starting Nmap 6.40 ( http://nmap.org ) at 2014-10-07 20:50 CEST

Nmap scan report for ---.homenet.telecomitalia.it (192.168.1.236)

Host is up (0.0044s latency).

Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds

nmap won't recognize the nostname, putting—in place of "mercury" and I assume is not a problem of nmap because it doesn't even access in this way:

root@mercury

when I changed the hostname I follow these steps

sudo nano /etc/hostname

and I wrote a single line with "mercury", then:

sudo nano /etc/hosts

with this configuration:

127.0.0.1       localhost

127.0.1.1       mercury localhost

::1             localhost ip6-localhost ip6-loopback

fe00::0         ip6-localnet

ff00::0         ip6-mcastprefix

ff02::1         ip6-allnodes

ff02::2         ip6-allrouters

and finally:

sudo /etc/init.d/hostname.sh start

am I doing something wrong?

edited Oct 7 '14 at 20:48

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

bumped to the homepage by Community♦ 33 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

That's probably the result of the reverse DNS lookup. What does host 192.168.1.236 print?

– Martin von Wittich
Oct 7 '14 at 19:07

236.1.168.192.in-addr.arpa domain name pointer ---.homenet.telecomitalia.it.

– Gabriele Salvatori
Oct 7 '14 at 19:10

Yep, it looks like the ---.homenet.telecomitalia.it is coming from your DNS server. If that is your local router provided by your ISP, have a look in the web interface - there could be a way to rename that entry.

– Martin von Wittich
Oct 7 '14 at 21:18

add a comment |

Scanning the machine on the LAN with my laptop, I got this:

gabriele @ osiris { ~ } [ Tue Oct 07 ] [ 08:49 PM]

 nmap -sP 192.168.1.236



Starting Nmap 6.40 ( http://nmap.org ) at 2014-10-07 20:50 CEST

Nmap scan report for ---.homenet.telecomitalia.it (192.168.1.236)

Host is up (0.0044s latency).

Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds

nmap won't recognize the nostname, putting—in place of "mercury" and I assume is not a problem of nmap because it doesn't even access in this way:

root@mercury

when I changed the hostname I follow these steps

sudo nano /etc/hostname

and I wrote a single line with "mercury", then:

sudo nano /etc/hosts

with this configuration:

127.0.0.1       localhost

127.0.1.1       mercury localhost

::1             localhost ip6-localhost ip6-loopback

fe00::0         ip6-localnet

ff00::0         ip6-mcastprefix

ff02::1         ip6-allnodes

ff02::2         ip6-allrouters

and finally:

sudo /etc/init.d/hostname.sh start

am I doing something wrong?

edited Oct 7 '14 at 20:48

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

Scanning the machine on the LAN with my laptop, I got this:

gabriele @ osiris { ~ } [ Tue Oct 07 ] [ 08:49 PM]

 nmap -sP 192.168.1.236



Starting Nmap 6.40 ( http://nmap.org ) at 2014-10-07 20:50 CEST

Nmap scan report for ---.homenet.telecomitalia.it (192.168.1.236)

Host is up (0.0044s latency).

Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds

nmap won't recognize the nostname, putting—in place of "mercury" and I assume is not a problem of nmap because it doesn't even access in this way:

root@mercury

when I changed the hostname I follow these steps

sudo nano /etc/hostname

and I wrote a single line with "mercury", then:

sudo nano /etc/hosts

with this configuration:

127.0.0.1       localhost

127.0.1.1       mercury localhost

::1             localhost ip6-localhost ip6-loopback

fe00::0         ip6-localnet

ff00::0         ip6-mcastprefix

ff02::1         ip6-allnodes

ff02::2         ip6-allrouters

and finally:

sudo /etc/init.d/hostname.sh start

am I doing something wrong?

shell networking nmap lan

edited Oct 7 '14 at 20:48

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

edited Oct 7 '14 at 20:48

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

edited Oct 7 '14 at 20:48

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

asked Oct 7 '14 at 19:06

Gabriele Salvatori

1114

bumped to the homepage by Community♦ 33 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

bumped to the homepage by Community♦ 33 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

That's probably the result of the reverse DNS lookup. What does host 192.168.1.236 print?

– Martin von Wittich
Oct 7 '14 at 19:07

236.1.168.192.in-addr.arpa domain name pointer ---.homenet.telecomitalia.it.

– Gabriele Salvatori
Oct 7 '14 at 19:10

Yep, it looks like the ---.homenet.telecomitalia.it is coming from your DNS server. If that is your local router provided by your ISP, have a look in the web interface - there could be a way to rename that entry.

– Martin von Wittich
Oct 7 '14 at 21:18

add a comment |

That's probably the result of the reverse DNS lookup. What does host 192.168.1.236 print?

– Martin von Wittich
Oct 7 '14 at 19:07

236.1.168.192.in-addr.arpa domain name pointer ---.homenet.telecomitalia.it.

– Gabriele Salvatori
Oct 7 '14 at 19:10

Yep, it looks like the ---.homenet.telecomitalia.it is coming from your DNS server. If that is your local router provided by your ISP, have a look in the web interface - there could be a way to rename that entry.

– Martin von Wittich
Oct 7 '14 at 21:18

That's probably the result of the reverse DNS lookup. What does host 192.168.1.236 print?

– Martin von Wittich
Oct 7 '14 at 19:07

236.1.168.192.in-addr.arpa domain name pointer ---.homenet.telecomitalia.it.

– Gabriele Salvatori
Oct 7 '14 at 19:10

Yep, it looks like the ---.homenet.telecomitalia.it is coming from your DNS server. If that is your local router provided by your ISP, have a look in the web interface - there could be a way to rename that entry.

– Martin von Wittich
Oct 7 '14 at 21:18

add a comment |

1 Answer
1

active

oldest

votes

change ur /etc/hosts file from

127.0.0.1 localhost

127.0.1.1 mercury localhost

to:

127.0.0.1 localhost

192.168.1.236 mercury

once you do that, "ping mercury" or "nmap mercury" should work, and the inverse, "nmap 192.168.1.236" should then show the hostname associated with that IP in /etc/hosts, in the nmap report output

answered Oct 7 '14 at 19:29

nandoP

35613

Seems doesn't work.

– Gabriele Salvatori
Oct 7 '14 at 19:35

paste ur output... paste ur hosts file

– nandoP
Oct 9 '14 at 20:49

add a comment |

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change ur /etc/hosts file from

127.0.0.1 localhost

127.0.1.1 mercury localhost

to:

127.0.0.1 localhost

192.168.1.236 mercury

once you do that, "ping mercury" or "nmap mercury" should work, and the inverse, "nmap 192.168.1.236" should then show the hostname associated with that IP in /etc/hosts, in the nmap report output

answered Oct 7 '14 at 19:29

nandoP

35613

Seems doesn't work.

– Gabriele Salvatori
Oct 7 '14 at 19:35

paste ur output... paste ur hosts file

– nandoP
Oct 9 '14 at 20:49

add a comment |

change ur /etc/hosts file from

127.0.0.1 localhost

127.0.1.1 mercury localhost

to:

127.0.0.1 localhost

192.168.1.236 mercury

once you do that, "ping mercury" or "nmap mercury" should work, and the inverse, "nmap 192.168.1.236" should then show the hostname associated with that IP in /etc/hosts, in the nmap report output

answered Oct 7 '14 at 19:29

nandoP

35613

Seems doesn't work.

– Gabriele Salvatori
Oct 7 '14 at 19:35

paste ur output... paste ur hosts file

– nandoP
Oct 9 '14 at 20:49

add a comment |

change ur /etc/hosts file from

127.0.0.1 localhost

127.0.1.1 mercury localhost

to:

127.0.0.1 localhost

192.168.1.236 mercury

once you do that, "ping mercury" or "nmap mercury" should work, and the inverse, "nmap 192.168.1.236" should then show the hostname associated with that IP in /etc/hosts, in the nmap report output

answered Oct 7 '14 at 19:29

nandoP

35613

change ur /etc/hosts file from

127.0.0.1 localhost

127.0.1.1 mercury localhost

to:

127.0.0.1 localhost

192.168.1.236 mercury

once you do that, "ping mercury" or "nmap mercury" should work, and the inverse, "nmap 192.168.1.236" should then show the hostname associated with that IP in /etc/hosts, in the nmap report output

answered Oct 7 '14 at 19:29

nandoP

35613

answered Oct 7 '14 at 19:29

nandoP

35613

answered Oct 7 '14 at 19:29

nandoP

35613

answered Oct 7 '14 at 19:29

nandoP

35613

Seems doesn't work.

– Gabriele Salvatori
Oct 7 '14 at 19:35

paste ur output... paste ur hosts file

– nandoP
Oct 9 '14 at 20:49

add a comment |

Seems doesn't work.

– Gabriele Salvatori
Oct 7 '14 at 19:35

paste ur output... paste ur hosts file

– nandoP
Oct 9 '14 at 20:49

Seems doesn't work.

– Gabriele Salvatori
Oct 7 '14 at 19:35

paste ur output... paste ur hosts file

– nandoP
Oct 9 '14 at 20:49

add a comment |

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