Re: Dual NIC vs Single NIC

Terence, you're gonna make me hot under the collar.

_ALL_ members of a Windows AD should use _only_ AD aware DNS servers for
name resolution. Should Joe perform the action you describe and restart his
SBS any client machine which makes a name query while SBS' DNS is
unavailable will switch to querying his AD-ignorant router/ISP for name
queries. The PC's will then experience problems requesting AD resources
until they switch back to using SBS DNS.

Whoever suggested you should pass on this advice needs to talk to MS Active
Directory development, then be shot.

"Terence Liu [MSFT]" <v-terliu@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:vw0WxA0fIHA.6616@xxxxxxxxxxxxxxxxxxxxxxxxx
Hello Joe,

Thank you for posting here. Let's also thank others for the input.

According to your description, I understand that you want to client
computers could access Internet when you shutdown or restart the SBS for
maintenance. If I have misunderstood the problem, please don't hesitate to
let me know.

Based on my research, this is a DNS and DHCP issue. By default the SBS is
the DNS server for all clients. After you shutdown the SBS, the client
computers unable to resolve the domain name of Internet. So the Internet
access fail.

For this, we can make the DHCP on SBS to assign second DNS server to all
client computers. When the primary DNS (SBS) is not available, the clients
will try the alternate DNS server.

1. Run command "dhcpmgmt.msc" on SBS to open DHCP console
2. Extend DHCP -> SBS.domain.local -> Scope -> Scope Options
3. Double click "006 DNS Servers" in right pane
4. Input the second DNS (your ISP DNS), click Add

Note: Ensure the SBS IP is above your ISP IP in the list.

5. Click OK
6. Restart the clients

Note: If you rerun the CEICW, the above configuration will be reset to
default value. Therefore, you need to perform the above steps again after
your rerun the CEICW.

Of course, this workaround does not work when the client restarts at the
SBS shutdown time. The client gets IP address from SBS, if the SBS
shutdown, the client unable to detect the DHCP server, and unable to get
IP. The whole network of client will be unavailable.

To workaround this scenario, you only have to disable DHCP on SBS and make
your router work as DHCP server. However, this is not recommended. If you
like, you can try it yourself.

I hope these steps will give you some help.

Thanks and have a nice day!

Best regards,

Terence Liu(MSFT)

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--------------------
| Thread-Topic: Dual NIC vs Single NIC
| thread-index: Ach+7Ycor51Gr0zTRzilimYCEQJBpQ==
| X-WBNR-Posting-Host: 207.46.19.168
| From: =?Utf-8?B?Sm9l?= <Joe@xxxxxxxxxxxxxxxxxxxxxxxxx>
| References: <FA164BBD-4DB2-452C-ADF2-9AE5BCEA6430@xxxxxxxxxxxxx>
<ebEUjegfIHA.2540@xxxxxxxxxxxxxxxxxxxx>
<33796A03-8F47-4D52-AC09-1046343B1ABA@xxxxxxxxxxxxx>
<ekU3lVsfIHA.3940@xxxxxxxxxxxxxxxxxxxx>
| Subject: Re: Dual NIC vs Single NIC
| Date: Wed, 5 Mar 2008 10:20:01 -0800
| Lines: 73
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|
| Lanwench, thanks again for your input. I attempt to do as little
maintainence
| as possible during the work hours of course. However 2 of my clients are
| large churches and they have extended hours 7 days a wekk plus some of
the
| programs they run require maintance by the software support personel
during
| the 8-5 time frame.
|
| When I don't use ISA I typically intall a Sonicwall as my gateway and
more
| recently a newer firewall by Calyptix Security (it also has an internal
hard
| drive and will hold mail when the server is offline)
|
| Joe
|
| "Lanwench [MVP - Exchange]" wrote:
|
| > Joe <Joe@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
| > > Lanwrench that is one the problem with the dual nic setup, The users
| > > get to the internet thru the SBS box. If it is down, while they can
| > > log on to their own box they have no access to the outside world. I
| > > am looking for a way to make my systems a little more "bulletproof"
| > > and at the same time allow me to do some server maintainance without
| > > totally shutting down the office.
| >
| > Well, I don't think you should be doing server maintenance during the
| > business day, myself - but your server shouldn't be the gateway if you
don't
| > have ISA. Set all clients to point at your router's LAN IP as default
| > gateway.
| > >
| > > "Lanwench [MVP - Exchange]" wrote:
| > >
| > >> Joe <Joe@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
| > >>> In the past Most of my systems have been dual NIC usually with ISA
| > >>> but due to many reasons I am now considering going to a single NIC
| > >>> and moving away from ISA.
| > >>>
| > >>> Currently with my existing setup, if the SBS server is down, for
| > >>> what ever reason, my customers can't even get to the internet.
| > >>
| > >> Yes they can.....they just can't resolve names :)
| > >>>
| > >>> If I had a second member server set up as the backup DC, a single
| > >>> NIC SBS server, and a hardware firewall wouldn't that allow my
| > >>> customer to log on and access the internet if the SBS server was
| > >>> offline temporarly? I would still want the SBS server to run the
| > >>> DHCP and DNS roles but would assume that would not matter as long
| > >>> as the SBS machine was not down for more than a few hours at a
time.
| > >>
| > >> Yes. If you have another DC running AD-integrated DNS, and your
| > >> client workstations have the secondary DNS server listed, they
| > >> should work.
| > >>>
| > >>> The above seems logical to me, but then since I have not done it I
| > >>> am checking for any "gotchas" lying around that I might not be
| > >>> aware of.
| > >>>
| > >>> By the way I would be running SBS2003R2 on such an install that
| > >>> would assist me in the licencing issue of the second server which
| > >>> would be running server 2000 or 2003 as a member of the SBS box.
| > >>
| > >> You'd need to buy Windows 2000 or 2003 but I believe you wouldn't
| > >> need additional CALs.
| > >>
| > >> That all being said, if you're having regular problems with your
SBS
| > >> box going down, I'd rather address those - add as much redundancy
to
| > >> the server hardware as you can. That would be a better use of
money,
| > >> in my opinion, although it's true that outside of SBS, it's always
| > >> recommended to have more than one DC.
| > >>
| > >>>
| > >>> Joe
| >
| >
| >
| >
|



.

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