I have lost my DNS

I connect to internet from ISP via pppd.
From few days ago, I cannot ping any URL.
I have the error unknown host.
But if I use the IP, all works.
The nslookup command works fine too. it finds all the URL's that I submit it.
My resolv.conf file is good.

Example:
ping richese.arrakis.es
richese.arrakis.es Unknown host

nslookup richese.arrakis.es
Adress: 195.5.65.130

ping 195.5.65.130
all works fine

What is the problem ?
jespoAsked:
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ahoffmannCommented:
check  /etc/host.conf, should have something like:
      order bind hosts
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jespoAuthor Commented:
Thx, but the answer arrives late :)
i have migrated from my slak 3.1 to RedHat 4.2
I keep this answer for future problems.
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