Two NICs in one machine and same LAN?

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Hi,
If I setup two NICs using 10.1.1.1/24 and 10.1.1.2/24 addresses in one
machine, what could be happen? Can DNS handle this? Will it work in the
network?
Thanks,
Roger

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Why? This is usually not a good idea and does nothing for your network
except cause confusion. What are you trying to accomplish with these 2 nics?

--
Scott Harding
MCSE, MCSA, A+, Network+
Microsoft MVP - Windows NT Server

"RQ" <r.qian@inetmail.att.net> wrote in message
news:e4qm8C3YEHA.712@TK2MSFTNGP11.phx.gbl...
> Hi,
> If I setup two NICs using 10.1.1.1/24 and 10.1.1.2/24 addresses in one
> machine, what could be happen? Can DNS handle this? Will it work in the
> network?
> Thanks,
> Roger
>
>

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

I know this is not a good idea, but our database guy wants to set second NIC
up on secondary database server using primary server's IP when the primary
goes down and still keep secondary server's first NIC IP active.
I don't know how to prove this is not a good idea. Please help.
Roger



"Scott Harding - MS MVP" <scrockel@**NO_SPAM**hotmail.com> wrote in message
news:uB4zMV3YEHA.2648@tk2msftngp13.phx.gbl...
> Why? This is usually not a good idea and does nothing for your network
> except cause confusion. What are you trying to accomplish with these 2
nics?
>
> --
> Scott Harding
> MCSE, MCSA, A+, Network+
> Microsoft MVP - Windows NT Server
>
> "RQ" <r.qian@inetmail.att.net> wrote in message
> news:e4qm8C3YEHA.712@TK2MSFTNGP11.phx.gbl...
> > Hi,
> > If I setup two NICs using 10.1.1.1/24 and 10.1.1.2/24 addresses in one
> > machine, what could be happen? Can DNS handle this? Will it work in the
> > network?
> > Thanks,
> > Roger
> >
> >
>
>

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In news:OS9fpC4YEHA.1000@TK2MSFTNGP12.phx.gbl,
RQ <r.qian@inetmail.att.net> posted a question
Then Kevin replied below:
> I know this is not a good idea, but our database guy
> wants to set second NIC up on secondary database server
> using primary server's IP when the primary goes down and
> still keep secondary server's first NIC IP active.
> I don't know how to prove this is not a good idea. Please
> help.

>> "RQ" <r.qian@inetmail.att.net> wrote in message
>> news:e4qm8C3YEHA.712@TK2MSFTNGP11.phx.gbl...
>>> Hi,
>>> If I setup two NICs using 10.1.1.1/24 and 10.1.1.2/24
>>> addresses in one machine, what could be happen? Can DNS
>>> handle this? Will it work in the network?
>>> Thanks,
>>> Roger

It is never a good idea to put two NICs on the same machine on the same
subnet unless, they are teamed.

--
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
============================
--
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[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Would you please provide a answer why it's not a good idea?


"Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US> wrote in message
news:%23MVzFe4YEHA.2260@TK2MSFTNGP12.phx.gbl...
> In news:OS9fpC4YEHA.1000@TK2MSFTNGP12.phx.gbl,
> RQ <r.qian@inetmail.att.net> posted a question
> Then Kevin replied below:
> > I know this is not a good idea, but our database guy
> > wants to set second NIC up on secondary database server
> > using primary server's IP when the primary goes down and
> > still keep secondary server's first NIC IP active.
> > I don't know how to prove this is not a good idea. Please
> > help.
>
> >> "RQ" <r.qian@inetmail.att.net> wrote in message
> >> news:e4qm8C3YEHA.712@TK2MSFTNGP11.phx.gbl...
> >>> Hi,
> >>> If I setup two NICs using 10.1.1.1/24 and 10.1.1.2/24
> >>> addresses in one machine, what could be happen? Can DNS
> >>> handle this? Will it work in the network?
> >>> Thanks,
> >>> Roger
>
> It is never a good idea to put two NICs on the same machine on the same
> subnet unless, they are teamed.
>
> --
> Best regards,
> Kevin D4 Dad Goodknecht Sr. [MVP]
> Hope This Helps
> ============================
> --
> When responding to posts, please "Reply to Group" via your
> newsreader so that others may learn and benefit from your
> issue. To respond directly to me remove the nospam. from my
> email. ==========================================
> http://www.lonestaramerica.com/
> ==========================================
> Use Outlook Express?... Get OE_Quotefix:
> It will strip signature out and more
> http://home.in.tum.de/~jain/software/oe-quotefix/
> ==========================================
> Keep a back up of your OE settings and folders with
> OEBackup:
> http://www.oehelp.com/OEBackup/Default.aspx
> ==========================================
>
>

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

In news:uGiowr5YEHA.2480@tk2msftngp13.phx.gbl,
RQ <r.qian@inetmail.att.net> posted a question
Then Kevin replied below:
> Would you please provide a answer why it's not a good
> idea?
Because they are different networks, and should be addressed acordingly.
Lets say that there is a machine with IP 10.1.1.3, which network provides
the way to that machine?
If one is 10.1.1.x and the other is also 10.1.1.x the machine won't know
which way to go to get to a machine that is on one or the other networks.
One should be 10.1.1.x and the other could be 10.1.0.x.
If both NICs are on the same subnet, they should be teamed and would only
have one IP address for both NICs. If you have two NICs on the same machine
with different IP addresses looking at each other (not teamed) only one will
get used at a time. Plus, if you have NetBIOS enabled, one of the NICs if
not both will be disabled due to a NetBIOS name conflict. It is like having
to machines on the same Network with the same NetBIOS name.

Suppose a query is sent to DNS for this machine and DNS gives the 10.1.1.1
address but that address is not on the subnet that has that address?
Ther is no way for DNS to know which address to give, it will just use round
robin. If they are on different subnets, DNS will use Netmask ordering to
give the correct record. (based on 10.1.1.x or 10.1.0.x)



--
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
============================
--
When responding to posts, please "Reply to Group" via your
newsreader so that others may learn and benefit from your
issue. To respond directly to me remove the nospam. from my
email. ==========================================
http://www.lonestaramerica.com/
==========================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
==========================================
Keep a back up of your OE settings and folders with
OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
==========================================

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Thanks Kevin, it helps.


"Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US> wrote in message
news:OGmv6$5YEHA.2432@tk2msftngp13.phx.gbl...
> In news:uGiowr5YEHA.2480@tk2msftngp13.phx.gbl,
> RQ <r.qian@inetmail.att.net> posted a question
> Then Kevin replied below:
> > Would you please provide a answer why it's not a good
> > idea?
> Because they are different networks, and should be addressed acordingly.
> Lets say that there is a machine with IP 10.1.1.3, which network provides
> the way to that machine?
> If one is 10.1.1.x and the other is also 10.1.1.x the machine won't know
> which way to go to get to a machine that is on one or the other networks.
> One should be 10.1.1.x and the other could be 10.1.0.x.
> If both NICs are on the same subnet, they should be teamed and would only
> have one IP address for both NICs. If you have two NICs on the same
machine
> with different IP addresses looking at each other (not teamed) only one
will
> get used at a time. Plus, if you have NetBIOS enabled, one of the NICs if
> not both will be disabled due to a NetBIOS name conflict. It is like
having
> to machines on the same Network with the same NetBIOS name.
>
> Suppose a query is sent to DNS for this machine and DNS gives the 10.1.1.1
> address but that address is not on the subnet that has that address?
> Ther is no way for DNS to know which address to give, it will just use
round
> robin. If they are on different subnets, DNS will use Netmask ordering to
> give the correct record. (based on 10.1.1.x or 10.1.0.x)
>
>
>
> --
> Best regards,
> Kevin D4 Dad Goodknecht Sr. [MVP]
> Hope This Helps
> ============================
> --
> When responding to posts, please "Reply to Group" via your
> newsreader so that others may learn and benefit from your
> issue. To respond directly to me remove the nospam. from my
> email. ==========================================
> http://www.lonestaramerica.com/
> ==========================================
> Use Outlook Express?... Get OE_Quotefix:
> It will strip signature out and more
> http://home.in.tum.de/~jain/software/oe-quotefix/
> ==========================================
> Keep a back up of your OE settings and folders with
> OEBackup:
> http://www.oehelp.com/OEBackup/Default.aspx
> ==========================================
>
>

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

If redundancy is what your looking for maybe you should investigate clustering the SQL servers.

Ian Bagnald
MCSE:Security Windows 2000
MCSA:Security Windows 2000
COMPTIA A+

"RQ" wrote:

> Thanks Kevin, it helps.
>
>
> "Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US> wrote in message
> news:OGmv6$5YEHA.2432@tk2msftngp13.phx.gbl...
> > In news:uGiowr5YEHA.2480@tk2msftngp13.phx.gbl,
> > RQ <r.qian@inetmail.att.net> posted a question
> > Then Kevin replied below:
> > > Would you please provide a answer why it's not a good
> > > idea?
> > Because they are different networks, and should be addressed acordingly.
> > Lets say that there is a machine with IP 10.1.1.3, which network provides
> > the way to that machine?
> > If one is 10.1.1.x and the other is also 10.1.1.x the machine won't know
> > which way to go to get to a machine that is on one or the other networks.
> > One should be 10.1.1.x and the other could be 10.1.0.x.
> > If both NICs are on the same subnet, they should be teamed and would only
> > have one IP address for both NICs. If you have two NICs on the same
> machine
> > with different IP addresses looking at each other (not teamed) only one
> will
> > get used at a time. Plus, if you have NetBIOS enabled, one of the NICs if
> > not both will be disabled due to a NetBIOS name conflict. It is like
> having
> > to machines on the same Network with the same NetBIOS name.
> >
> > Suppose a query is sent to DNS for this machine and DNS gives the 10.1.1.1
> > address but that address is not on the subnet that has that address?
> > Ther is no way for DNS to know which address to give, it will just use
> round
> > robin. If they are on different subnets, DNS will use Netmask ordering to
> > give the correct record. (based on 10.1.1.x or 10.1.0.x)
> >
> >
> >
> > --
> > Best regards,
> > Kevin D4 Dad Goodknecht Sr. [MVP]
> > Hope This Helps
> > ============================
> > --
> > When responding to posts, please "Reply to Group" via your
> > newsreader so that others may learn and benefit from your
> > issue. To respond directly to me remove the nospam. from my
> > email. ==========================================
> > http://www.lonestaramerica.com/
> > ==========================================
> > Use Outlook Express?... Get OE_Quotefix:
> > It will strip signature out and more
> > http://home.in.tum.de/~jain/software/oe-quotefix/
> > ==========================================
> > Keep a back up of your OE settings and folders with
> > OEBackup:
> > http://www.oehelp.com/OEBackup/Default.aspx
> > ==========================================
> >
> >
>
>
>