what does the "?" means - When I issue "arp -a " , I can see as followings.
This is a discussion on what does the "?" means - When I issue "arp -a " , I can see as followings. within the Linux Networking forums, part of the Linux Forums category; Hi, When I issue "arp -a " , I can see as followings. ? (192.168.3.222) at 00:01:...
|
|||||||
| FAQ | Members List | Calendar | Search | Today's Posts | Mark Forums Read |
12-05-2005
|
|||
|
|||
what does the "?" means - When I issue "arp -a " , I can see as followings.
Hi,
When I issue "arp -a " , I can see as followings. ? (192.168.3.222) at 00:01:02:8D:93:80 [ether] on eth0 ? (222.112.196.68) at 00:D0:B7:B6:C0:31 [ether] on eth1 ? (222.112.196.69) at 00:02:55:AA:95:5E [ether] on eth1 I'd like to know what does the "?" means at first column? Have a day. 
|
|
12-05-2005
|
|||
|
|||
|
Re: what does the "?" means - When I issue "arp -a " , I can seeas followings.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 somez72 wrote: > Hi, > > When I issue "arp -a " , I can see as followings. > > ? (192.168.3.222) at 00:01:02:8D:93:80 [ether] on eth0 > ? (222.112.196.68) at 00:D0:B7:B6:C0:31 [ether] on eth1 > ? (222.112.196.69) at 00:02:55:AA:95:5E [ether] on eth1 > > I'd like to know what does the "?" means at first column? The first column is the hostname. If you specified the -n option to arp, or the hostname can't be resolved, you get a questionmark in that column. - -- Lew Pitcher Master Codewright & JOAT-in-training | GPG public key available on request Registered Linux User #112576 (http://counter.li.org/) Slackware - Because I know what I'm doing. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.7 (GNU/Linux) iD8DBQFDk5mhagVFX4UWr64RAu5MAJoDlP5sdQJ19UE1RV1ApB QeDYuZrACgwnJc Qja3KSmZgdmnghxTa8FajnY= =XT4K -----END PGP SIGNATURE-----
|
|
12-05-2005
|
|||
|
|||
|
Re: what does the "?" means - When I issue "arp -a " , I can see as followings.
On Mon, 5 Dec 2005 09:41:00 +0900, somez72
<rambo@lsdata.co.kr> wrote: > Hi, > > When I issue "arp -a " , I can see as followings. > > ? (192.168.3.222) at 00:01:02:8D:93:80 [ether] on eth0 > ? (222.112.196.68) at 00:D0:B7:B6:C0:31 [ether] on eth1 > ? (222.112.196.69) at 00:02:55:AA:95:5E [ether] on eth1 > > I'd like to know what does the "?" means at first column? > It means the IP addresses have no known hostname, or arp uses the -n option by default. -- Fine's Corollary: Functionality breeds Contempt.
|
|
12-06-2005
|
|||
|
|||
|
then, How can we get hostname in first column?
then, How can we get hostname in first column?
I think, I nerver seen that host name in first colume? Have a day. > > Hi, > > > > When I issue "arp -a " , I can see as followings. > > > > ? (192.168.3.222) at 00:01:02:8D:93:80 [ether] on eth0 > > ? (222.112.196.68) at 00:D0:B7:B6:C0:31 [ether] on eth1 > > ? (222.112.196.69) at 00:02:55:AA:95:5E [ether] on eth1 > > > > I'd like to know what does the "?" means at first column? > > > It means the IP addresses have no known hostname, or arp uses the -n > option by default. > > -- > Fine's Corollary: > Functionality breeds Contempt.
|
|
12-06-2005
|
|||
|
|||
|
Re: then, How can we get hostname in first column?
On Tue, 6 Dec 2005 11:05:43 +0900, somez72 wrote:
> then, How can we get hostname in first column? > I think, I nerver seen that host name in first colume? $ arp -a fw.home.invalid (192.168.2.1) at 00:A0:CC:26:06:34 [ether] on eth0 $ head /etc/hosts 127.0.0.1 localhost 192.168.2.1 fw.home.invalid fw 192.168.2.10 wb.home.invalid wb 192.168.2.12 wb1.home.invalid wb1
|
|
12-06-2005
|
|||
|
|||
|
Re: then, How can we get hostname in first column?
"somez72" <rambo@lsdata.co.kr> writes:
> then, How can we get hostname in first column? > I think, I nerver seen that host name in first colume? Works for me... snowball:548$ /usr/sbin/arp -a elmyra.wb.comcast.net (192.168.0.15) at 00:60:97:C2:C2:95 [ether] on eth0 babs.wb.comcast.net (192.168.0.14) at 00:C0:F0:3E:49:F7 [ether] on eth0 zoya.wb.comcast.net (192.168.0.13) at 00:20:A6:57:75:84 [ether] on eth0 noodlenoggin.wb.comcast.net (192.168.0.11) at 00:50:DA:80:46:11 [ether] on eth0 pinky.wb.comcast.net (192.168.0.1) at 00:13:10:92:FE:52 [ether] on eth0 -- Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605 Department of Computer Science FAX -- (505) 646-1002 New Mexico State University http://www.cs.nmsu.edu/~pfeiffer skype: jjpfeifferjr
|
|
12-06-2005
|
|||
|
|||
|
Re: then, How can we get hostname in first column?
On Mon, 05 Dec 2005 21:05:43 -0500, somez72 <rambo@lsdata.co.kr> wrote:
>> > Hi, >> > >> > When I issue "arp -a " , I can see as followings. >> > >> > ? (192.168.3.222) at 00:01:02:8D:93:80 [ether] on eth0 >> > ? (222.112.196.68) at 00:D0:B7:B6:C0:31 [ether] on eth1 >> > ? (222.112.196.69) at 00:02:55:AA:95:5E [ether] on eth1 >> > >> > I'd like to know what does the "?" means at first column? >> > >> It means the IP addresses have no known hostname, or arp uses the -n >> option by default. >then, How can we get hostname in first column? > I think, I nerver seen that host name in first colume? There's no hostname to get. It tries to find one in DNS. If that's your network, configure your DNS server to provide a name.
|
Linear Mode
