DNS problem on system connected to LAN using fedora 10

pavan6754 · 06-27-2009, 11:39 AM

hi
iam having problem of DNS..
since ping host wget commands are not working.iam using wireless card to connect to network and able to access internet with good speed.
network manager is enabled .In network connection setting for ipv4 i used automatic DHCP

Code:

[sai@localhost ~]$ ping www.google.com
  ping: unknown host www.google.com

contents of /etc/resolv.conf are..

Code:

[sai@localhost ~]$ cat /etc/resolv.conf
  # Generated by NetworkManager
  nameserver 172.20.29.25

i had set value of PEERDNS to no in..

Code:

/etc/sysconfig/network-scripts/ifcfg-<interface>

but no use
even before yum was not working due to dns problem.
but i hav added ip addr for host in /etc/host file and got yum working.

thanks in advance.
plse help me it's urgent...

paulsm4 · 06-27-2009, 11:54 AM

Q1: Can you ping your name server (172.20.29.25)?

Based on what you've said, it's entirely possible that maybe your wlan doesn't even have an IP address (/sbin/ifconfig will tell you). Or perhaps it doesn't have a valid gateway (/sbin/ifconfig will tell you that, too).

Q2: Run ifconfig:

a) Do you have a valid IP address?
b) Can you ping that IP's gateway?
c) Can you ping your DNS name server?

If your yum repository is actually an external address, and if hard-coding it's IP into /etc/hosts fixed it, it's a good bet that a), b) and probably even c) will be "true". But please check them!

Q3: Is the "name server" actually a DNS server?

Use "dig" to investigate further:
http://networking.ringofsaturn.com/U...leshooting.php

'Hope that helps .. PSM

pavan6754 · 06-28-2009, 11:23 AM

Quote:

Originally Posted by paulsm4

Q1: Can you ping your name server (172.20.29.25)?

Based on what you've said, it's entirely possible that maybe your wlan doesn't even have an IP address (/sbin/ifconfig will tell you). Or perhaps it doesn't have a valid gateway (/sbin/ifconfig will tell you that, too).

Q2: Run ifconfig:

a) Do you have a valid IP address?
b) Can you ping that IP's gateway?
c) Can you ping your DNS name server?

If your yum repository is actually an external address, and if hard-coding it's IP into /etc/hosts fixed it, it's a good bet that a), b) and probably even c) will be "true". But please check them!

Q3: Is the "name server" actually a DNS server?

Use "dig" to investigate further:
http://networking.ringofsaturn.com/U...leshooting.php

'Hope that helps .. PSM

no iam not able to ping my name server(172.20.29.5).but able to ping my default gateway(172.20.0.99).

i got dns server by automatic DHCP in network setting and controlled by
network manager.

o/p of ifconfig wlan0

Code:

[sai@localhost ~]$ ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr 00:22:69:A1:07:75  
          inet addr:172.20.90.9  Bcast:172.20.255.255  Mask:255.255.0.0
          inet6 addr: fe80::222:69ff:fea1:775/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4617492 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2728862 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1420768398 (1.3 GiB)  TX bytes:196954000 (187.8 MiB)
          Interrupt:17 Memory:fe7fc000-fe800000

i am connected to internet and able to browse,download...

dig nslookup whois are not working

Code:

[sai@localhost ~]$ whois google.com
[Querying whois.verisign-grs.com]
[whois.verisign-grs.com: Name or service not known]
[Unable to connect to remote host]

Code:

[sai@localhost ~]$ dig google.com

; <<>> DiG 9.5.1b2-RedHat-9.5.1-0.8.b2.fc10 <<>> google.com
;; global options:  printcmd
;; connection timed out; no servers could be reached

Code:

[sai@localhost ~]$ nslookup google.com
;; connection timed out; no servers could be reached

thanks for ur replay..
plse help to solve this problem.

towhid · 06-29-2009, 04:01 AM

You better check connectivity with your DNS Server. Check with network administrator. Next check the DNS Server whether the name service is up and running.