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Configuring Cache Server with Bind

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i'm starting to experiment the dns configuration uasing but i'm alrteady facing issue.

i m using a lab available from the https://github.com/theurbanpenguin/lfcs and using a vagrant it create two linux vm.

It provide two ubuntu VM and the first step is to create a simple BIND Cache only Server which should work out of the bleu just installing bind9 and configuring the DNS client pointing to bind

but installing bind to ubuntu2 VM and configuring the DNS Client to 127.0.0.1 running i'm experiencing errors which the most common is:

- named[3156]: REFUSED unexpected RCODE resolving './NS/IN': 192.36.148.17#53

for each root servers. Ths errors means that ther root servers refused to reply to the DNS queries?

Other errors is that

- named[625]: validating lamer/DS: no valid signature found

- named[625]: no valid RRSIG resolving 'lamer/DS/IN': 198.97.190.53#53

which i solved changing

dnssec-validation no; on the /etc/bind/named.conf.options

and in this case it will work anso if i revert the change to the default dnssec-validation auto;

Do you have any idea where these problems come from? i'm confused

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