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From time to times I have to reboot my Ubuntu 11.04 remote desktop. Once it up and I run Cromium browser with many tabs (20 for example) dns server doesn't respond anymore. At beginning I suspected my ISP, so I replaced my /etc/resolv.conf with following values:

nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 8.8.8.8

The result is the same - I can't use browser for ~20 min. because names are not resolved, ping doesn't work either.

Any idea what is blocking?

Thomas Ward
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Dzidas
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3 Answers3

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Well, could really be a problem with your ISP DNSs and maybe they intercept DNS traffic and route it throurgh their servers...

Try a dig @8.8.8.8 www.ubuntu.com and see what happens.

Output should be like:

; <<>> DiG 9.7.3 <<>> @8.8.8.8 www.ubuntu.com 
; (1 server found) 
;; global options: +cmd 
;; Got answer: 
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54464 
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 

;; QUESTION SECTION: 
;www.ubuntu.com.      IN  A 

;; ANSWER SECTION: 
www.ubuntu.com.   497 IN  A 91.189.89.88 

;; Query time: 2307 msec 
;; SERVER: 8.8.8.8#53(8.8.8.8) 
;; WHEN: Thu Jul  7 14:23:41 2011 
;; MSG SIZE  rcvd: 48
Daniele Santi
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Try installing the dnsmasq package and configuring it to cache DNS for you. This should cut down on your DNS queries and may prevent whatever is blocking you from activating. It could be a DNS rate limit filter somewhere in your chain.

Your /etc/resolv.conf for dnsmasq should consist of 127.0.0.1. I am not sure if the current installer sets this up.

BillThor
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You can also use Google's open dns:

so could edit /etc/resolv.conf:

# Googles Public DNS

nameserver 8.8.8.8

nameserver 8.8.4.4

search localdomain

gare
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