I was browsing the archives of this list for more
info on Round Robin DNS. From the discussion
and further reading of whatever I could gather
it seems that Round Robin is implemented by BIND.
is it also implemented by the microsoft's DNS
version
as well ?
also if I were to a nslookup for www.domain.com
then this would give me a list of IP addresses that
a named.hosts file (as in a typical unix DNS box)
would have. correct ? however if an appliation such
as a HTTP request would make to a web server,
then it would just return one IP address from the
whole lot, ie it would implement the "round robin
method of dns".... correct ?
if this correct then, it would mean that BIND
returns
DNS query answers depending upon the appliation
requesting a dns query... is this correct ? i guess
this is so....
Please let me know your views on the implementation
of round robin dns. also any other info would be
greatly welcome at this time.
thanks
tally
-----------------------------------------------------------------------------
RE: Round-robin DNS?
Brett Watson ([EMAIL PROTECTED])
Mon, 10 Jun 1996 23:35:07 -0700
On Monday, June 10, 1996 4:40 PM, [EMAIL PROTECTED]
wrote:
>>
>>>>> How are people out there implementing
round-robin DNS? I have "n"
>>>>> servers acting as www.wherever.com and I want
to split the traffic
>>>>> bewteen them. Of course, if I could do a
proper load balancing that
>>>>> would be great, but a simple "n" way split is
a big help already.
>>>>
>>>> This is the default behaviour of DNSes ...
>>>> If www.foo.com refers several hosts, every DNS
query to the server
>>>>will give
>>>> you a different address.
>>>
>>> Untrue. Perhaps a few implementations of DNS do
this, but MOST do not
>>> behave in this manner.
>>err ...
>>I'd say, perhaps a few implementations of DNS
don't do this, but MOST
>>(AFAIK)
>>do behave in this manner ...
>>(Bind named, which is on all Unix boxen do that,
DNS NT servers do
>>that, etc ..)
>>
>>> [Nearly] any off-the-shelf DNS will give 'A
record' results in the
>>>same order
>>> every time.
>>I disagree.... but it's maybe going off topic.
>>
>>'just show me some DNS implementation that
doesn't round robin .. ?
>>Probably few of them are not round robin'ing, but
I have to disagree
>>when you
>>say that "any off-the-shelf" doesn't.
i think *maybe* what he means is:
1. when you use a tool to query dns you get all
address records listed
in the same order every time (the output that we
see)
i think *maybe* what you mean is:
1. most versions of bind do round robin when they
select an address
record to return to the resolver for a particular
host
you're both right. what we see as output for human
consumption with
dig/host/nslookup is not necessarily what the
operating system "sees"
when queries are made through the resolver. no?
semantics? :)
-brett
=====
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