Re: How does RoundRobin flag work?

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: Roger Abell (mvpNOSpam_at_asu.edu)
Date: 07/16/04 

Date: Thu, 15 Jul 2004 17:18:04 -0700

A few points to keep in mind.
Client caching can get in the way of seeing the effect of
pseudo-roundrobin ordering. Use ipconfig /flushdns on
the client to empty the caching resolver's cache so that it
actually does really send the next query to the DNS server.
When there are multiple A records for a name, and the use
of pseudo-roundrobin ordering is enabled, then the list of
IPs returned will start a successive IPs with each query.
If other clients query the name in between two of your test
trials this will cause the IP ordering to advance accordingly.
If your test client is on the same subnet as one of the interfaces
of the DNS server, and one of the IPs for the name queried is
also on this subnet, and you have subnet ordering enabled in
the DNS server settings, then this will control what you see
returned as the IP list. 

-- 
Roger Abell
Microsoft MVP (Windows Server System: Security)
MCSE (W2k3,W2k,Nt4)  MCDBA
"Peter Steele" <psteele@z-force.com> wrote in message
news:%23jCVcpraEHA.3752@TK2MSFTNGP12.phx.gbl...
> I read that the Windows DNS supports a flag called RoundRobin which lets
you
> perform a primitive round-robin load balancing. Can anyone explain how to
> set this up? When I read this I thought it would work like this:
>
>     ping mysystem.domain.com
>     ...192.168.1.1
>
>     ping mysystem.domain.com
>     ...192.168.1.2
>
>     ping mysystem.domain.com
>     ...192.168.1.3
>
> and so on, returning a different address each time a DNS lookup has to be
> performed. I created multiple A records for a host and tried this though
but
> it always returned the first address in the list. If I do a nslookup on
the
> name, it returns all A addresses as a list.
>
> So how is this feature supposed to be used? Alternatively, if someone can
> suggest an alternative way to implement a simple round-robin load
balancing
> like this, I'd appreciate the advice.
>
>
>

Relevant Pages

  • Re: GPO problems
    ... It was the ISA 2004 firewall client. ... DNS settings and network properties on the server and client computers. ... > Service of SBS is configured to be the DNS server on the problematic ...
    (microsoft.public.windows.server.sbs)
  • Re: Any known issues withsp2 and non-sp xp ics?
    ... Default Gateway: none ... DNS Server: 192.168.0.1 or your ISP's DNS server ... as my isp is configured to use DHCP (Dynamic Host ... After doing the above changes to the client, ...
    (microsoft.public.windowsxp.network_web)
  • Re: Windows 2003 Question - doing some part time work for a friend
    ... Go to the properties of TCP/IP for the network adapter connecting the client ... using your ISP's DNS server as alternate will cause another set of problems. ... Register those sensitive private SRV records on a server under your ...
    (microsoft.public.windows.server.general)
  • Re: DNS resolves wrong when vpn connects
    ... It involves a registry edit for the VPN client, ... correctly resolving the public DNS name to the internal IP when ... DNS server as their local DNS (i.e. if the local DHCP is passing out a public ... If your internal infrastructure is using one of those ranges, ...
    (microsoft.public.win2000.dns)
  • Re: Any known issues withsp2 and non-sp xp ics?
    ... DNS Server: 192.168.0.1 or your ISP's DNS server ... After doing the above changes to the client, ... occured because the network did not assign a network address to the computer. ... assigned to another adapter 'realtek...''realtek ethernet adapter' is hidden ...
    (microsoft.public.windowsxp.network_web)