DNS Server for VIP

Here is the example i am trying to use, while connecting to the database from the client machine.
We are building a Domain Name System (DNS) server. Do we need to include the VIP Address in the DNS list ?
RAC =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.lynx.co.uk)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.lynx.co.uk)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = RAC.WORLD)
Thanks
Prasad

Prasad,
I did not get the context of the question but if you check this link :
http://download.oracle.com/docs/cd/B19306_01/install.102/b14203/prelinux.htm#sthref375
it makes the following points :
One virtual IP (VIP) address with an associated network name registered in DNS. If you do not have an available DNS, then record the network name and VIP address in the system hosts file, /etc/hosts. Select an address for your VIP that meets the following requirements:
1) The IP address and network name are currently unused
2) The VIP is on the same subnet as your public interface
Before installation, check that the default gateway can be accessed by a ping command. During installation, OUI uses the ping command to ensure that the VIP is reachable. To find the default gateway, use the route command, as described in your operating system's help utility. After installation, configure clients to use either the VIP address, or the network name associated with the VIP. If a node fails, then the node's virtual IP address fails over to another node.
Please clarify if this was'nt your original question ..
Vishwa

Similar Messages

GSS as primary DNS Server for Intranet

Hi,
Can the GSS be used as a as primary DNS server for Intranet? An additional DNS server can be configured to answer the unknown Records like MX by GSS.
if it can be configured, I would be thankful if anyone shares with me the brief configuration steps Apart from configuring Answers, answer groups, domain lists, source address lists, DNS rules.
with thanks
sathappan

Yeah I'd certainly recommend against it! So essentially the client machines are unable to update or query dynamic AD related DNS records since they're not pointing to the DNS servers actually used by your AD server(s). I could well imagine that causing
issues, and meaning that some AD functionality won't work correctly.
I know you can directly integrate BIND with AD, eg so that the BIND servers are the ones used by AD, though I haven't tried it, but this seems to be neither.
I can't find any articles relating to your exact situation, presumably no one else has tried to use such a mixed and disjoined setup. I'd focus on looking for articles relating to why you shouldn't point your users at a router (most commonly in small setups
on ADSL) for the DNS rather than directing them to the server for DNS and then having that query the router for external results. It's a more common scenario and you're more likely to find articles relating to it.
One article you might find useful is
http://msmvps.com/blogs/acefekay/archive/2009/08/17/ad-and-its-reliance-on-dns.aspx which talks in terms of using your ISP's DNS servers on the client machines, but in your situation it sounds like the BIND servers are essentially providing an equivalent
setup.
There's also various discussions and comments on the topic elsewhere on these forums, for instance
http://social.technet.microsoft.com/Forums/windowsserver/en-US/c3ba3859-765e-4b3f-add0-eaf2c18e1068/i-have-dns-in-a-router-and-i-want-to-install-domain-controller?forum=winservergen and
http://social.technet.microsoft.com/Forums/windowsserver/en-US/b5df8fd4-7ab2-4d1e-afe2-c5263c4d69c3/dns-server-forwarding-and-clients-getting-address-of-registrars-ip?forum=winserverNIS which are worth checking out.

Dns server for specific domain

Is there a way to define a dns server for a specific domain?
I'm setting up a develop machine with an amp stack and i want to redirect all urls with a specific domain (i.e. project.dev) to 127.0.0.1.
I've done this on OSX with dnsmasq configured in this way:
# dnsmasq.conf
address=/.dev/127.0.0.1
listen-address=127.0.0.1
port=35353
and adding a dev file in /etc/resolver with this content
# /etc/resolver/dev
nameserver 127.0.0.1
port 35353
but this in arclinux with dhcpd doesn't work.
I've tested dnsmasq with
dig [email protected] -p 35353
and it works (the address returned is 127.0.0.1) so the problem is the resolver.
I've also tried either put into /etc/resov.conf.head this:
# /etc/resolv.conf.head
nameserver 127.0.0.1
port 35353
and configure dnsmasq with the default 53 port without luck.
This is my /etc/resolv.conf
# /etc/resolv.conf
nameserver 127.0.0.1
nameserver 192.168.0.1

On linux you should simply run all dns request through one nameserver that forwards everything it doesn't understand. [Edit: You can do that with dnsmasq.] Another simple way to create a local developer zone would be to use wildcard_dns_proxy instead.
Last edited by progandy (2015-03-03 17:20:29)

Moving from Exchange 2007 to 2013 (leaving the DNS Server for it's own dedicated server)

Hello! I am quite new to Exchange and Server management in general. I will do my best to explain my situation.
I am looking to move my Exchange server off of our DNS server. When we installed them on the same server, we did not have the funds to buy 2 separate servers. I am told that it is best to separate the two. I have followed the Microsoft instructions for installing
the prerequisites for Exchange 2013 on a 2012 R2 server, and i am at the point where it wants me to configure AD LDS. As I have active directory running on the current server, I was a little hesitant to just install it without understanding what i am doing.
After the AD LDS is configured, I believe i can move forward with installing Exchange 2013 (all 3 roles will be hosted on the new server), export the mailboxes from 2007 server and import them into the new Exchange 2013 server. After 2013 is up and stable,
I plan on removing 2007 from the old server (DNS server).
What are my next steps after importing the mailboxes? Am i missing important details that I need to change or migrate?
My biggest fear is that nothing works after the installation and moving the mailboxes over. For that case, it makes sense to keep 2007 installed as a fallback for when my installation fails and all i have lost is just my time :)
Current Server:
Windows Server 2008 Standard (64 bit)
1. Roles: Active Directory, DNS, IIS
2. Software: Exchange 2007
New Server:
Windows 2012 R2 Server
1. Roles: ???
1. Software to install: Exchange 2013
Thank you for any help you can provide!

These are good resources, but i am still caught up with the active directory issue. Am I able to keep the old Domain/DNS/Active directory on it's current server and move Exchange 2007 off onto a new server (with Exchange 2013)?
In the first example, he is moving everything (domain controller, exchange, users, etc) onto a different server and decommissioning it.I've been told that it would be better practice to keep the domain and exchange on 2 different servers. Is this true?
I go to run commands like:
.\setup /PrepareAD /OrganizationName: orgname /IAcceptExchangeServerLicenseTerms
on the new exchange server, as a prerequisite and it doesnt recognize the command - even after following the steps before. Is this because the new server is not a domain controller? does it have to be? What are the best practices for setting up a server(s)
with exchange + domain controller?
Thanks for responding.

How many DNS record need to create in Internal & external DNS server for exchange?

Hi friends,
I recently installed Exchange Server 2010 in my organization for testing purpose and I've register a pubic ip too for exchange server on godaddy.com. How many
internal & External DNS records reqired to configure on external & Internal dns server so my all feature like Auto-discover, Activ -sync,& webmail start working perfectly.
It's my first time configuring exchange for a organization.
Thanks & Regards,
Pradeep Chaugule

Hi,
Just as what ManU Philip said, you need to create
Autodiscovery.domaincom and mail.domain.com for external dns server.
Generally, you configure your Exchange Servers as DNS clients of your internal DNS server.
Refer from:
http://technet.microsoft.com/en-us/library/aa996996(v=exchg.65).aspx
Best Regards.

Externally Hosted DNS - How do I set up my 2003 DNS server for sub domain to point to internal IP address??

I have a domain name(domain.com) DNS hosted at my ISP. I also have 3 sub domains DNS hosted at the same ISP pointing to various external ip addresses (mail.domain.com, vpn.domain.com and ts.domain.com). We want to set up sales.domain.com to point to an
internal 10. IP address. We have AD integrated DNS servers for our 2003 AD domain. The AD domain name is totally different than the hosted domain name in question. I currently edit the host file for a couple of PC's but this isnt practical company wide so
I want to add entries on our internal AD DNS servers to resolve the locally hosted site. If i recall, someone once told me that you cannot just put an A record for one sub domain, I would have to have entries on my 2003 DNS server to resolve anything related
to the domain.com name. Is this accurate? If so, what is the proper way to configure my 2003 AD DNS server to resolve anything domain.com related for my internal users while still allowing my ISP to do the DNS lookup for the internet.

On my 2003 AD integrated DNS server...i rightclick forward lookup zone and choose...new zone..primary zone (store zone in AD checkbox checked)..i chose to all DNS servers in the AD domain for replication...zone name sales.domain.com....allow secure updates
option....then i added an A record in that zone...sales.domain.com..pointed that towards my internal 10. IP address...is this correct? It seems to be working correctly for the sales.domain.com DNS record...and i tested the other sub domains...and those look
like they are going to my ISP for DNS resolution...
Is this the correct procedure? I did this on a test AD domain and not my production...i want to make sure i dont break everything under the domain.com by incorrectly adding 1 sub domain..

Proper Configuration of DNS server for our new branch office

Hi All,
Our new office will setup a new branch office with a routed network link to our HO. In HO, we have 2 domain controllers configured as AD and DNS just for fail over scenarios.
How will we configure the DNS server of our 3rd domain controller which we will placed in the new branch office. What would be the proper settings of DNS server integrated to AD to work well especially to have a successful replication and communication to
the 2 DC's located in HO?

Hi,
If you have multiple DC's in that site i would recommend using any of the partner DC's IP addresses as preferred one and secondary DNS IP to pointing to itself. Dont use loopback addresses configure it with actual IP addresses.
If you have only one server in branch office point itself as the primary DNS and HO DC as secondary and tertiary.
Make sure that all clients in your branch site are pointing to the branch DC as primary DNS server.
Regards,
Rafic
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If it answered your question, remember to mark it as an "Answer".
This posting is provided "AS IS" with no warranties and confers no rights! Always test ANY suggestion in a test environment before implementing!

How to use DNS server for name resolution for items which don't exist in active directory domain controller DNS

Dear Experts,
In our office we have a domain controller call it 'Office.com', all computers and corporate servers e.g. exchange, antivirus etc. are member of this 'office.com', it is also having a DNS. All users in office have there preferred DNS set to the corporate
DNS
We are working for ministry and offering services to them from our data center so have many servers which are for ministry but they are in our data center. For all these servers we created another DNS server which contains all entries for these servers in
forward and reverse lookup zones. In this DNS we also created a forward lookup zone for our corporate servers and zone name is 'office.com'
What we are trying to have is name resolution of all servers which are listed in other DNS build in our office on Win 2008 R2 for ministry servers
If the user change his preferred DNS to ministry DNS he can resolve the ministry server but then we can not control any thing through group policy since they are using other DNS and not the corporate DNS.
How this can be done ? like any group policy applied to corporate domain controller must take effect on users and in addition to this user must also be able to resolve server names in ministry project DNS
Please assist ASAP.
regards,

Hello,
ok so the GPO setting doesn't apply in any case.
Clients machines use the first DNS server in the list of configured ones on the NIC. If that one is available search for additional DNS servers will stop.
What i can not really understand is your description about the second DNS server. This should normally either another DC with AD integrated DNS, so everything is replicatedwithin AD replication or you use a secondary DNS on domain member server that pulls
the informations from the Master.
It sounds for me that you have configured a machine with DNS server role and created manually the zone with the same name as the domainand manually create there the required A records?
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://msmvps.com/blogs/mweber/
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

2K8 - Best practice for setting the DNS server list on a DC/DNS server for an interface

We have been referencing the article
"DNS: DNS servers on <adapter name> should include their own IP addresses on their interface lists of DNS servers"
http://technet.microsoft.com/en-us/library/dd378900%28WS.10%29.aspx but there are some parts that are a bit confusing. In particular is this statement
"The inclusion of its own IP address in the list of DNS servers improves performance and increases availability of DNS servers. However, if the DNS server is also a domain
controller and it points only to itself for name resolution, it can become an island and fail to replicate with other domain controllers. For this reason, use caution when configuring the loopback address on an adapter if the server is also a domain controller.
The loopback address should be configured only as a secondary or tertiary DNS server on a domain controller.”
The paragraph switches from using the term "its own IP address" to "loopback" address. This is confusing becasuse technically they are not the same. Loppback addresses are 127.0.0.1 through 127.255.255.255. The resolution section then
goes on and adds the "loopback address" 127.0.0.1 to the list of DNS servers for each interface.
In the past we always setup DCs to use their own IP address as the primary DNS server, not 127.0.0.1. Based on my experience and reading the article I am under the impression we could use the following setup.
Primary DNS: Locally assigned IP of the DC (i.e. 192.168.1.5)
Secondary DNS: The assigned IP of another DC (i.e. 192.168.1.6)
Tertiary DNS: 127.0.0.1
I guess the secondary and tertiary addresses could be swapped based on the article. Is there a document that provides clearer guidance on how to setup the DNS server list properly on Windows 2008 R2 DC/DNS servers? I have seen some other discussions
that talk about the pros and cons of using another DC/DNS as the Primary. MS should have clear guidance on this somewhere.

Actually, my suggestion, which seems to be the mostly agreed method, is:
Primary DNS: Locally assigned IP of the DC (i.e. 192.168.1.5)
Secondary DNS: The assigned IP of another DC (i.e. 192.168.1.6)
Tertiary DNS: empty
The tertiary more than likely won't be hit, (besides it being superfluous and the list will reset back to the first one) due to the client side resolver algorithm time out process, as I mentioned earlier. Here's a full explanation on how
it works and why:
This article discusses:
WINS NetBIOS, Browser Service, Disabling NetBIOS, & Direct Hosted SMB (DirectSMB).
The DNS Client Side Resolver algorithm.
If one DC or DNS goes down, does a client logon to another DC?
DNS Forwarders Algorithm and multiple DNS addresses (if you've configured more than one forwarders)
Client side resolution process chart
http://msmvps.com/blogs/acefekay/archive/2009/11/29/dns-wins-netbios-amp-the-client-side-resolver-browser-service-disabling-netbios-direct-hosted-smb-directsmb-if-one-dc-is-down-does-a-client-
logon-to-another-dc-and-dns-forwarders-algorithm.aspx
DNS
Client side resolver service
http://technet.microsoft.com/en-us/library/cc779517.aspx
The DNS Client Service Does Not Revert to Using the First Server in the List in Windows XP
http://support.microsoft.com/kb/320760
Ace Fekay
MVP, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007 & Exchange 2010, Exchange 2010 Enterprise Administrator, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights.
I agree with this proposed solution as well:
Primary DNS: Locally assigned IP of the DC (i.e. 192.168.1.5)
Secondary DNS: The assigned IP of another DC (i.e. 192.168.1.6)
Tertiary DNS: empty
One thing to note, in this configuration the Best Practice Analyzer will throw the error:
The network adapter Local Area Connection 2 does not list the loopback IP address as a DNS server, or it is configured as the first entry.
Even if you add the loopback address as a Tertiary DNS address the error will still appear. The only way I've seen this error eliminated is to add the loopback address as the second entry in DNS, so:
Primary DNS: The assigned IP of another DC (i.e. 192.168.1.6)
Secondary DNS: 127.0.0.1
Tertiary DNS: empty
I'm not comfortable not having the local DC/DNS address listed so I'm going with the solution Ace offers.
Opinion?

Do I need to run local DNS server for NAT/DHCP to work?

Hello,
I'm coming across all kinds of explanations how to set up a server for public access, having a static IP and a pointed domain, but I have a dynamic public IP and don't need the server to be accessible through a domain name. I just want all the computers in my office to connect to the web over 1 cable connection. I've used Gateway Setup Assistant to set up NAT and DHCP and DNS and what not, but it didn't work out of the box. After some bootpd.plist fixes I now have DHCP working, it's handing out IP addresses, but all LAN connected machines cannot get onto the web, only the server can.
What am I doing wrong? Should I configure my DNS server differently? Or should it not be on at all, couldn't the local machines use my ISP's DNS servers?
Currently DNS is configured like this:
Settings are:
accept recursive queries from the following networks: localnets
forwarder IP addresses: (empty)
Zones are:
private. primary zone
134.23.24.in-addr.arpa. reverse zone

Though still a valid question for others I guess, I got my DNS working. The network preferences didn't have external DNS servers configured for the local network interface.

Configure proxy and dns server for a single URLConnection

Hello!
I am relatively new to network programming in Java so I was looking for a solution to set a DNS server and a PROXY server for one SINGLE UrlConnection. The settings should only be used in one thread, while another thread maybe has different settings.
The most suggestions I found on the net looked like follows:
Proxy:
System.setProperty("proxyPort","8080");
System.setProperty("proxyHost","proxy");
DNS Server
sun.net.spi.nameservice.provider.<n>=<default|dns,sun|...>
sun.net.spi.nameservice.nameservers=<server1_ipaddr,server2_ipaddr ...>
sun.net.spi.nameservice.domain=<domainname>
The problem is that both solutions are not thread safe and the settings are valid system wide (as far as I am understand). In my application a lot of different workerThreads open a connection to a remote server via URLConnection , for example:
URL url = new URL("http://www.sun.com");
HttpURLConnection con = (HttpURLConnection) url.openConnection();In the worst case 200 different workerThreads open a connection nearly at the same time. If the worst case happens one workerThread changes the DNS and PROXY settings and in the next step another thread which already has set dns and proxy tries to connect to a specified server with wrong dns and proxy settings.
One solution would be to synchronize the whole method that configures the connection and tries to connect to a remote server but that would be a very bad solution for me, because all other threads have to wait until the last thread has finished.
My question: Is there a possibility to configure a different DNS server and a different PROXY server for each URLConnection, for example something like:
URL url = new URL("http://www.sun.com");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setProxyHost("proxy");
con.setProxyPort("3128");
con.setProxyUsername("user");
con.setProxyPassword("pass");
con.setDNS("85.27.63.2");Thanks in advance for your answers.
Kind regards,
Buliwyf

Mainly because it's in the spec. I did not figure out exactly why it is necessary to use different dns servers. Let me give you a quick glimpse what the application should do:
The application checks if a URL is still available and returns an xml file with a return code (401 for example), connection time, an extract of thesource code and other information. This event repeats periodically (every 10 s, 20 min...). Therefore the customer has a good overview about the availability of his websites.
The customer himself controls the process with a xml configuration file that is read on the startup of the application. In the xml file you can find information like: connection timeout, http proxy, https proxy, used user agents, prefered request method (post or get) and regretfully even the DNS server that should be used.
Regretfully I don't have a chance to get the dns removed from the spec. The GUI which delivers the xml is already implemented and won't be changed.

What is the best DNS server for iCloud and Apple services?

Hello. Im wondering what is the best DNS server to use with iCloud, and apple services.
Does apple have a dedicatrd DNS server?
I read a couple of articles stating that the google DNS servers like 8.8.8.8 and 8.8.4.4 slow down apple and facebook services.
Did a couple of tests like iTunes streaming and found out that its true in some cases.

Not always!
Found what i was shearching for:
http://www.who.is/dns/icloud.com/

Access Connections fails to recognize DNS server for wired Ethernet connections

I'm running Windows 7 on a Thinkpad T410i. I ran the Lenovo update yesterday which updated Access Connections from 6.01 to 6.21. I then could not make any network connections to the Internet. I used Windows System Restore to back out the changes made by the Lenovo updater.
Since then, I am able to connect to the Internet using the wireless adapter, but the wired LAN connection fails to connect to the Internet because it doesn't recognize the DNS servers The wired LAN adapter is the Intel 82577LM Gigabit Network Connection. The IP v4 configuration settings haven't changed (use DHCP, obtain IP and DNS addresses automatically), but it can't seem to connect to the DNS servers.
The message from Windows Network Diagnostics is:
Your computer appears to be correctly configured, but the device or resource (DNS server) is not responding.
The symptoms appear the same as in this problem in the Lenovo support library, but that was occuring with Access Connections 2.60, a much earlier version of the software:
Network connection is not working if Access Connection is used to set DNS information - ThinkPad General
Symptom
When a wired (Ethernet or Token Ring), network profile is created with Access Connections v2.60, the user may be unable to connect to a LAN or the Internet.
Affected configurations
Any model ThinkPad system using Access Connections v2.60
Does anyone have any suggestions? Thanks!
Michael

pariswd wrote:
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Welcome to the forum!
Yes, some Lenovo employees do read and post to this forum. Mark is quite active, and several others post as well. In addition, there are lurkers who just read without making public comments although sometimes they ask the mod team to either gather more information or pass along advice.
However, here are the expectations of their participation from the Welcome message:
These communities have been created to provide a high quality atmosphere in which users of Lenovo products and services may share experiences and expertise. While members from Lenovo may participate at intervals to engage in the discussions and offer advice and suggestions, this forum is not designed as a dedicated and staffed support channel.
The bottom line is there's no guarantee that you will get an answer to a question here directly from Lenovo.
On the other hand, you just might! ;-)
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I am not a Lenovo Employee.
I AM one of those crazy ThinkPad zealots!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"!

Time Capsule as DHCP Router and DNS server for larger network - too taxing?

Ok, let me say first that I'm no networking expert, but I have tried to learn a decent amount over the years. I haven't got quite gotten o the level of combing router event logs, though I intend to do that as my next step. My question here though is if my overall network strategy is flawed.
My setup at home is one that may be a bit more extensive than most users have:
Cable modem -> Time Capsule -> Multiple gigabit switches (business grade) -> Wired Cat5e throughout the house and 2 Airport Extremes. I don't know how many total wired and wireless clients I have, but it may be between 30 and 40 (only a few are computers with the rest being game systems, networked DVRs, audio streamers, NAS, etc)
At the moment, the Time Capsule only backs up one machine - a MBP (I have external HDDs connected directly to the desktops). I don't use the TC's HDD for anything else. Also, I have the network configured so that the TC handles DHCP addressing and NAT. The Airport Extremes are in bridge mode.
For the most part, everything works very well. Internet speeds are good, audio streaming works well, no problems with TC backups, etc. The only issue I've run into are dropouts when streaming video content on the network from one device to another (not form the internet). Basically, the stream will pause and then an error will pop up on screen saying that there was a network problem. Now, I know that the specific devices themselves may have issues of their own, but since it's happened on more than one system, I'm wondering if there is a common network culprit- expecting the Time Capsule to handle its duties especially while it is doing a backup.
Here are a few thoughts I have:
1 - From a technical standpoint, I don't know if all client to client network traffic goes through the TC. I was thinking that communication could happen between devices on the same switch without having to go up to the TC and then back down, but maybe I'm wrong. If I am wrong, that certainly is a bottleneck right there. I'm not segregating the video streamers to their own subnet on a new router to isolate the traffic. I'm also not sure if the bottleneck is impacted by static vs dynamic IP addressing. IOW, I don't know if setting the devices up with static IPs would change the flow of traffic to not have to go through the TC (just flow across the switch) or not.
2 - Long ago in a different network setup, I had allowed the wireless access points to assign IPs. However, I found that doing so sometimes created problems accessing some of those devices from a computer or device on a different subnet. As such, I switched over to having the router connected to the modem do all the IP addressing. Maybe this is a bad idea given the temporary nature that some devices will hop on and off the network.
3 - Additionally, in the interests of getting better wireless coverage over the whole house, I switched to using 2 airport extremes configured to use the same SSID (so that devices moving around the house wouldn't need to specifically change networks in order to get better signal). I guess I could let one of those 2 handle IP addressing while the other is in bridge mode (pointing to the primary Extreme vs the TC).
4 - Kind of getting back to the TC as the bottleneck, maybe it shouldn't handle network wide DHCP and NAT duties. If TC backups take network priority, such that other kinds of traffic could hiccup, then I probably need to rethink where the TC should exist in the network. Or, maybe it would be enough to just have the stream sensitive components be on their own subnet.
I know there are potentially multiple flaws in my current strategy, so any suggestions or attempts at correcting my assumptions would be helpful.
Thanks!
Jeff
Message was edited by: Rgbyhkr
Message was edited by: Rgbyhkr

Welcome to the discussions!
1 - Everything goes through the router when it is setup to handle DHCP and NAT
2 - You want your main router, the TC, to handle all DHCP and NAT functions. It will handle up to 250+ connections, so 30-40 devices won't be much of a challenge
3 - Keep both AirPort Extremes in bridge mode to allow the TC to handle the things in #2 above. If you setup an Airport Extreme to give out IP addresses, you'll create a Double NAT issue on your network...which can slow down communications between devices...the thing you are trying to avoid. If you use Xbox live or other interactive services, the online features will not function with a Double NAT on your network.
4 - You want the TC to handle all DHCP and NAT functions as in #2. I assume that you have no single run of CAT5e more than 300 feet.
5 - If you want to create separate sub nets correctly (the AirPorts won't allow you to do this as they are designed for basic home networking), you'll need to look at routers for professional and commercial use, like Cisco.
With as many devices as you have, you may be running out of bandwidth at times. If you only notice the issue during Time Machine backups, and you don't need to backup each hour, take a look at Time Machine Editor to setup backups whenever you like, maybe once a day at 2 AM when things on the network are quiet.
My suggestions are of course opinions. Hopefully you'll receive some other possibly differing views.

DNS/web-server hosted off-site. How to set up Leopard server for mail?

Hey Everyone,
Brand new xserve with leopard server 10.5.2. Currently, Our web and DNS server for our domain,"company.com" is co-located off-site with an MX record of "mail.company.com" pointed at the static IP of the office where our mail server is. I want to replace the mail server with the xserve. With that in mind, how do I configure the DNS on the xserve during initial configuration to reflect that? Give it a self-referencing FQDN like server.company.office and see if the mail service can handle the domain hosted elsewhere?
I'm pretty new to servers and would love be able to keep this all in Standard but I'm not afraid to jump into Advanced if need be. I've created a test domain through GoDaddy of "company2.com" with an MX record of "mail.company2.com" pointing at the IP address of the xserve. Any help would be greatly appreciated!

Hello,
Have a look at this blog post:
http://blogs.adobe.com/captivate/2010/08/reporting-the-quiz-results-to-a-local-server.html
Lilybiri

DNS Server for VIP

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