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No, there is no "fast fail" mechanism as you suggest. In a
properly-architected DNS-resolution infrastructure, there are multiple
upstreams configured at every link of the resolution chain. By the time
one link in that chain (e.g. server1) has exhausted all of its
upstreams (server2a, server2b, server2c), if it sends back a "fast
fail" to the downstream (client), the downstream will most likely have
moved to _its_ next upstream (server1b, server1c, etc.), so it ignores
the "fast fail" response, and what value did it add, really? It's just
a waste of bandwidth/resources.<br>
<br>
- Kevin<br>
<br>
On 6/18/2010 5:31 AM, Christophe Lermytte wrote:
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Hello,<br>
<br>
I'm trying to find out what the server behavior should be in the
following situation:<br>
<br>
client -> server1 -> server2<br>
<br>
client asks server1 to recursively resolve a name<br>
server1 does not know and asks server2<br>
server2 sends an ICMP Port Unreachable to server1<br>
<br>
Is there something server1 can send to client, instead of making client
wait until it gives up?<br>
<br>
Thanks,<br>
CL<br>
<br>
<br>
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