can ping ip but not hostname

mrbabis · 02-28-2006, 11:25 AM

Hi.

ehh...

I can ping IP's but not host names.
I traid to relseas and update IP few times with dhclient, but not got any good results.

IP chages often becouse I changing routers and IP's, not know if it is depends on it.
ClamAV cannot get updates too :'(

===My-OS's===
Linux TSL/Trustix
Installed:
samba, apache, openssh, proftpd,
no firewall/ClamAV
-
WinXP SP2
no firewall/AV

nadroj · 02-28-2006, 11:28 AM

is your DNS working? can you use a web browser and point to something like 'yahoo.com'? or must you use the ip of yahoo to get to the site?

baruah · 02-28-2006, 11:32 AM

check out the entry in /etc/resolv.conf or whatever equivalent in your OS.Can you ping to that IP address ?

Regards
BB

sugar2 · 02-28-2006, 12:09 PM

hi, i experienced the same issue but when i filled the /etc/resolv.conf with my isp dns ips.
now i have the follow question:
why i can ping to ips and host with no problem... and why i cannot ping my lan hosts? i only can ping to theit lan ips.

sugar2 · 02-28-2006, 12:09 PM

how can i fix it?

okmyx · 02-28-2006, 12:37 PM

Manualy add your lan host names into your hosts file (/etc/hosts)

I don't think your ISP is going to have a record of all your local hostnames in their DNS tables.

http://en.wikipedia.org/wiki/Hosts_file

sugar2 · 02-28-2006, 12:41 PM

it sounds logical... actually last i have other linux server with all the lan hostnames in that file... but my questuion is: since i have DHCP enbabled sometimes the host's ips change and the /etc/hosts file became ambiguous... is there a way to automaticaly mantain updated that file?

Darin · 02-28-2006, 03:42 PM

You can set up DHCP with dynamic DNS that updates a DNS server (can be the same computer as the DHCP server) If you were able to ping the hosts on your LAN by name before you changed your resolv.conf then this is likely already set up. Once you have a DNS server set up to resolve local hostnames, you also need to set it up to either forward unknown requests to another DNS server or set it up with a root zone "." that points to root DNS servers. This makes it so you can ping hosts on The Internet by name.

sugar2 · 02-28-2006, 04:26 PM

why most linux users use a linux box as a dhcp server instead a builtin dhcp of a router or gateway?

mrbabis · 03-01-2006, 03:24 AM

thank you /etc/resolv.conf
I got it to work

Darin · 03-01-2006, 11:20 AM

Quote:

Originally Posted by sugar2

why most linux users use a linux box as a dhcp server instead a builtin dhcp of a router or gateway?

-I did it partly to learn how to set it up.
-The "built in dhcp of a router or gateway" on your typical SOHO router doesn't have the functionality and configurability that the Linux daemon does.
-The Linux box that is set up as the DHCP server is also set up as the router as well, so it's really just a PC that replaces those little routers.

sugar2 · 03-01-2006, 11:35 AM

i cant imagine what more features can have a linux box than a cisco 800 series router for saying something.
i am linux user since 1999 and i never has used a linux box for replace a network device...

Mr_C · 03-02-2006, 01:12 AM

to refer to a machine by host name you need to configure windBIND or named depending on your distro.

sugar2 · 03-02-2006, 11:35 AM

slackware is my distro...

Darin · 03-02-2006, 12:56 PM

Quote:

Originally Posted by Mr_C

to refer to a machine by host name you need to configure windBIND or named depending on your distro.

Quote:

Originally Posted by sugar2

slackware is my distro...

Then it would be named.

To get it to automatically update when host/IP pairings change you set up your DHCP server to give dynamic updates to your DNS server