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Ubuntu etc resolv conf (/etc/resolv.conf)

This is a discussion on Ubuntu etc resolv conf (/etc/resolv.conf) within the Ubuntu / Debian forums, part of the Linux Distribution category; My /etc/resolv.conf is not writable. How do I make it writable and what is the format for the same without ...

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  #1 (permalink)  
Old 22-06-2009, 06:21 AM
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Default Ubuntu etc resolv conf (/etc/resolv.conf)
My /etc/resolv.conf is not writable. How do I make it writable and what is the format for the same without GUI editor for dns?
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Old 23-06-2009, 04:15 AM
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Here is my file
Code:
 cat /etc/resolv.conf
Output:
Code:
nameserver 127.0.0.1
nameserver 192.168.0.1
nameserver 4.2.2.1
Make sure root has access /etc/resolv.conf as 0755:
Code:
chmod 0755 /etc/resolv.conf
ls -l /etc/resolv.conf
Make sure file is not write protected see
http://www.cyberciti.biz/tips/linux-password-trick.html
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Old 05-07-2009, 07:09 PM
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Quote:
Originally Posted by nixcraft View Post
Here is my file
Code:
 cat /etc/resolv.conf
Output:
Code:
nameserver 127.0.0.1
nameserver 192.168.0.1
nameserver 4.2.2.1
Make sure root has access /etc/resolv.conf as 0755:
Code:
chmod 0755 /etc/resolv.conf
ls -l /etc/resolv.conf
Make sure file is not write protected see
Linux Password trick with immutable bit using chattr command
One question: isn't it better to set 644 for security reasons?
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Old 05-07-2009, 07:24 PM
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Yes rw r r (0644) is sufficient permission for resolv.conf.
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Old 05-07-2009, 07:41 PM
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Quote:
Originally Posted by nixcraft View Post
Yes rw r r (0644) is sufficient permission for resolv.conf.
Thanks. One more question, think it has also to do with resolv.conf or so: I have Debian (etch), DynDNS, BIIND9. When doing nslookup it works correctly and resolves my DynDNS domain name to the actual IP addres of my machnie, but when trying to ping, it shows another IP address, and 100% packet loss. I tried restarting bind9 and resolvconf but it doesn't help. What might be the problem and what - the solution?
Thanks in advance
By the way: nice site. +10
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Old 05-07-2009, 07:54 PM
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Quote:
Originally Posted by Action View Post
Thanks. One more question, think it has also to do with resolv.conf or so: I have Debian (etch), DynDNS, BIIND9. When doing nslookup it works correctly and resolves my DynDNS domain name to the actual IP addres of my machnie, but when trying to ping, it shows another IP address, and 100% packet loss. I tried restarting bind9 and resolvconf but it doesn't help. What might be the problem and what - the solution?
Thanks in advance
By the way: nice site. +10
Look like caching issue to me. Use dig to trace problem:
Code:
dig your.dnydns.com A +trace
BIND9 is working as a caching server for local lan? If so this can be fixed by flushing cache:
Code:
sudo /etc/init.d/nscd restart 
sudo /etc/init.d/named restart
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Old 05-07-2009, 08:00 PM
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Quote:
Originally Posted by nixcraft View Post
Look like caching issue to me. Use dig to trace problem:
Code:
dig your.dnydns.com A +trace
BIND9 is working as a caching server for local lan? If so this can be fixed by flushing cache:
Code:
sudo /etc/init.d/nscd restart 
sudo /etc/init.d/named restart
Code:
; <<>> DiG 9.3.4-P1.1 <<>> port.selfip.org A +trace
;; global options:  printcmd
.			517026	IN	NS	ns7.opennic.glue.
.			517026	IN	NS	ns21.opennic.glue.
.			517026	IN	NS	ns22.opennic.glue.
.			517026	IN	NS	ns1.opennic.glue.
.			517026	IN	NS	ns2.opennic.glue.
.			517026	IN	NS	ns5.opennic.glue.
.			517026	IN	NS	ns6.opennic.glue.
;; Received 262 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms

and it tells that it could not get address for ns5/ns7.opennic.glue. Should I remove anything about .glue zone form the BIND9 config? I anyway cannot get it working - the forwarders do resolve opennic.glue, but the local name server doesn't.
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