Some questiones about DNS Redirection
Joseph S D Yao
jsdy at cospo.osis.gov
Wed Mar 1 17:18:56 UTC 2000
On Fri, Jan 28, 2000 at 03:06:47PM +0000, Barry Margolin wrote:
> In article <49256874.002660ED.00 at mail.dacomst.com>, <scyoon at dacom.net> wrote:
> > 1. Some people test DNS redirection. They said that redirected DNS query from
> > a client resolver
> > is success(Case 1), but query through a local DNS Server is fail(Case 2). What
> > is the difference between two cases?
> > Case 1: Client PC --- L4 Switch (Alteon 180) ---- DNS Server = success
> > Case 2: Client PC --- local DNS Server --- L4 Switch (Alteon 180) ---- DNS
> > Server = fail
> > Are there any differences between query packet format or flags ?
>
> Clients usually send queries with the Recursion Desired flag set. Caching
> DNS servers usually send queries with this flag not set.
I've been 'way backed up with e-mail for various reasons, and a lot of
my stored e-mail just got corrupted. ;-/ So apologies if this has
already been mentioned.
If the local DNS server HAS to go through the switch, and the switch is
sufficiently a network presence that it receives and redirects DNS
queries [which I find surprising but possible], then maybe you could
try "forward"ing your DNS queries to it. That should set the Recurse
flag, eh?
I have never used this device, so no guarantees.
--
Joe Yao jsdy at cospo.osis.gov - Joseph S. D. Yao
COSPO/OSIS Computer Support EMT-B
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