On 09/01/13 13:53, Daniele wrote:
This is the scenario.
I installed BIND9 via `apt-get` on a newly installed UBUNTU 12.04,
virtualized on VirtualBox.
The network works properly because if I indicate a different server from
my own BIND9 (the first line of '/etc/resolv.conf' is, for example,
`nameserver 8.8.8.8`) the lookups and any action on the Internet succeed.
No, this assumption is not valid.
A recursive resolver emits different queries, and different kinds of
queries, to those a client sends *to* a recursive resolver. Most
notably, EDNS is enabled and this large IP/UDP fragments can be
expected, particularly if you are doing DNSSEC validation.
Whether that's your problem I don't know. But you can't assume the
network path is good just because you can query googles public recursive
DNS.
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