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Old 08-15-2010, 10:50 PM   #1
Ed Eckelmeyer
LQ Newbie
Registered: Aug 2010
Location: Noank, CT
Distribution: Ubuntu 9.10
Posts: 1

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Smile Address Resolution Protocol (ARP) problem

I am using Ubuntu 9.10 on a Dell Inspiron 1420 notebook.

Everything has been working ok for months. All of a sudden I can only receive data (either via browser or email client), but I cannot send outbound data.

I can however connect to Google, entering a search term and receive a listing of related URLs, but I cannot connect to any of the listed URLs, getting a message that says "cannot find server, ---- etc" or words to that effect.

Same problem with Earthlink. I can connect to it, and receive e-mail but I cannot send outbound message.

I can probably connect to other "high level" URLs and get the same results. I obviously have an Address Resolution Protocol (ARP) problem but don't know how to fix it other than to re-install Ubuntu OS.

Both Ethernet and wireless work OK and other computers in the house work just fine via the same common router.

Any suggestions as to how to solve the problem without a re-install of OS?

Thanks, Ed
Old 08-15-2010, 11:05 PM   #2
LQ Guru
Registered: Mar 2004
Distribution: SusE 8.2
Posts: 5,863
Blog Entries: 1

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Hi -

No, actually is sounds like you probably have a DNS issue.

1. Write down the IP addresses of the DNS server(s) one or more of the computers that work.

2. Write down the IP addresses of the DNS server(s) on your "common router". And your (DSL modem? Cable modem? Other?)

3. Now look at /etc/nsswitch.conf.
Make sure "host" is includes "dns":

4. Finally, look at /etc/resolv.conf.
Make sure one or more of the "known good" DNS IP addresses appears at the TOP of the list.

'Hope that helps .. PSM

You might want to also look at:
5. /etc/dhclient.conf



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