Newbie IP Conflict

Hi I have just purchased a Netgear modem and FVS 338 firewall to connect our
network to the internet (old router packed up, all working ok before this
happened) I set up the modem to connect to the internet (without the
firewall to make sure it would connect) and all the computers connected to
the network lost their connections to mapped drives on the server. When
restarting the server it comes up with an error message that there is an IP
address conflict. How do I go about sorting this problem?

The modem connects to a Netgear switch and the sever runs on Windows Sever
2003 Std edition.

Also the sever has 2 network cards which works OK with them both plugged
into the switch until you plug the modem into the switch then you get an
error message on the 2nd network card on the server which basically disables
this card. What do I need to do to set it up properly?

Please don't forget I am new to this so please don't get to technical.

Thanks Bob

dbl <(E-Mail Removed)> wrote:
> Hi I have just purchased a Netgear modem and FVS 338 firewall to
> connect our network to the internet (old router packed up, all
> working ok before this happened) I set up the modem to connect to the
> internet (without the firewall to make sure it would connect) and all
> the computers connected to the network lost their connections to
> mapped drives on the server. When restarting the server it comes up
> with an error message that there is an IP address conflict. How do I
> go about sorting this problem?
> The modem connects to a Netgear switch and the sever runs on Windows
> Sever 2003 Std edition.
>
> Also the sever has 2 network cards which works OK with them both
> plugged into the switch until you plug the modem into the switch then
> you get an error message on the 2nd network card on the server which
> basically disables this card. What do I need to do to set it up
> properly?
> Please don't forget I am new to this so please don't get to technical.
>
> Thanks Bob

Well, I'll try, but this is technical stuff. Who set up the original
server/network?

Did you set the Netgear firewall's LAN IP to match the LAN IP you were using
on your old router/device?

Are you using ActiveDirectory?

Why does your server have two NICs?

Post an unedited ipconfig /all from the server and one workstation. Do this
in a command prompt -

ipconfig /all >c:\filename.txt

....then copy/paste the output here, clearly labeling which is the server &
which is the workstation.

Hello dbl,

Did you use some teaming software for the server NIC? If not only use one
of them, because you get problems with two different ip addresses on one
server.

How is the ipaddress setup in your network? Fixed ip addresses or runs DHCP
server on the 2003 machine? Is the Netgear modem also the router for your
network? How do you connect the clients, additional switch or on the modem?
If the Netgear is also a router it maybe is configured by default also as
DHCP server and can conflict with the 2003 DHCP server.

Best regards

Meinolf Weber
Disclaimer: This posting is provided "AS IS" with no warranties, and confers
no rights.

> Hi I have just purchased a Netgear modem and FVS 338 firewall to
> connect our network to the internet (old router packed up, all working
> ok before this happened) I set up the modem to connect to the internet
> (without the firewall to make sure it would connect) and all the
> computers connected to the network lost their connections to mapped
> drives on the server. When restarting the server it comes up with an
> error message that there is an IP address conflict. How do I go about
> sorting this problem?
>
> The modem connects to a Netgear switch and the sever runs on Windows
> Sever 2003 Std edition.
>
> Also the sever has 2 network cards which works OK with them both
> plugged into the switch until you plug the modem into the switch then
> you get an error message on the 2nd network card on the server which
> basically disables this card. What do I need to do to set it up
> properly?
>
> Please don't forget I am new to this so please don't get to technical.
>
> Thanks Bob
>

Ok the server was set up by an IT company (who are not around any more)
2 NIC's when the server was purchased I was told this would help speed
thinks up. Unsure if teaming software was used. But when both cables are
plugged into the switch it does seem to make a difference when large amount
of data are moving around the network you always had to unplug the old modem
though.

DHCP sever is disabled on the 2003 server machine.
All work stations are set to automatic IP address.
The old modem router was set as the DHCP server, unable to get any data from
it, so unsure how it was set up.
The modem is connected to a Netgear switch and is also set as DHCP server.
Have not tried to set it up yet with the firewall, I just wanted to see if
it would connect to the net, which it did.
The modem will be connected to a Netgear firewall then the switch when this
problem is resolved.
Is the ActiveDirectory where all the users are set up, where you can add or
delete users change passwords etc, if so yes, if not where do I go to find
out?

Sorry but is it safe to post the IP addresses?

Thanks Bob

"Lanwench [MVP - Exchange]"
<(E-Mail Removed) hoo.com> wrote in message
news:%(E-Mail Removed)...
> dbl <(E-Mail Removed)> wrote:
>> Hi I have just purchased a Netgear modem and FVS 338 firewall to
>> connect our network to the internet (old router packed up, all
>> working ok before this happened) I set up the modem to connect to the
>> internet (without the firewall to make sure it would connect) and all
>> the computers connected to the network lost their connections to
>> mapped drives on the server. When restarting the server it comes up
>> with an error message that there is an IP address conflict. How do I
>> go about sorting this problem?
>> The modem connects to a Netgear switch and the sever runs on Windows
>> Sever 2003 Std edition.
>>
>> Also the sever has 2 network cards which works OK with them both
>> plugged into the switch until you plug the modem into the switch then
>> you get an error message on the 2nd network card on the server which
>> basically disables this card. What do I need to do to set it up
>> properly?
>> Please don't forget I am new to this so please don't get to technical.
>>
>> Thanks Bob
>
> Well, I'll try, but this is technical stuff. Who set up the original
> server/network?
>
> Did you set the Netgear firewall's LAN IP to match the LAN IP you were
> using on your old router/device?
>
> Are you using ActiveDirectory?
>
> Why does your server have two NICs?
>
> Post an unedited ipconfig /all from the server and one workstation. Do
> this in a command prompt -
>
> ipconfig /all >c:\filename.txt
>
> ...then copy/paste the output here, clearly labeling which is the server &
> which is the workstation.
>

dbl <(E-Mail Removed)> wrote:
> Ok the server was set up by an IT company (who are not around any
> more)

It would be a good idea for your company to look for another IT support
company in your area, I suspect.


> 2 NIC's when the server was purchased I was told this would
> help speed thinks up. Unsure if teaming software was used. But when
> both cables are plugged into the switch it does seem to make a
> difference when large amount of data are moving around the network

If this is true, then it must be using teaming software.

>
> you always had to unplug the old modem though.

The modem? Why?
>
> DHCP sever is disabled on the 2003 server machine.

You should enable it there - not on your router.

> All work stations are set to automatic IP address.
> The old modem router was set as the DHCP server, unable to get any
> data from it, so unsure how it was set up.

You can figure out what you need based on the ipconfig /all from the server.

> The modem is connected to a Netgear switch and is also set as DHCP
> server.

So you have a dynamic public IP address? Meaning, your modem will give an IP
address to the Netgear, and the Netgear will have a static/private IP
address.



> Have not tried to set it up yet with the firewall, I just
> wanted to see if it would connect to the net, which it did.
> The modem will be connected to a Netgear firewall then the switch
> when this problem is resolved.

Don't connect without the firewall in place even for a nanosecond.


> Is the ActiveDirectory where all the users are set up, where you can
> add or delete users change passwords etc, if so yes, if not where do
> I go to find out?

Yes, it is.
>
> Sorry but is it safe to post the IP addresses?

Yes, it should be fine. Especially since this is private / nonroutable IP
address info.

>
> Thanks Bob
>
> "Lanwench [MVP - Exchange]"
> <(E-Mail Removed) hoo.com> wrote in
> message news:%(E-Mail Removed)...
>> dbl <(E-Mail Removed)> wrote:
>>> Hi I have just purchased a Netgear modem and FVS 338 firewall to
>>> connect our network to the internet (old router packed up, all
>>> working ok before this happened) I set up the modem to connect to
>>> the internet (without the firewall to make sure it would connect)
>>> and all the computers connected to the network lost their
>>> connections to mapped drives on the server. When restarting the
>>> server it comes up with an error message that there is an IP
>>> address conflict. How do I go about sorting this problem?
>>> The modem connects to a Netgear switch and the sever runs on Windows
>>> Sever 2003 Std edition.
>>>
>>> Also the sever has 2 network cards which works OK with them both
>>> plugged into the switch until you plug the modem into the switch
>>> then you get an error message on the 2nd network card on the server
>>> which basically disables this card. What do I need to do to set it
>>> up properly?
>>> Please don't forget I am new to this so please don't get to
>>> technical. Thanks Bob
>>
>> Well, I'll try, but this is technical stuff. Who set up the original
>> server/network?
>>
>> Did you set the Netgear firewall's LAN IP to match the LAN IP you
>> were using on your old router/device?
>>
>> Are you using ActiveDirectory?
>>
>> Why does your server have two NICs?
>>
>> Post an unedited ipconfig /all from the server and one workstation.
>> Do this in a command prompt -
>>
>> ipconfig /all >c:\filename.txt
>>
>> ...then copy/paste the output here, clearly labeling which is the
>> server & which is the workstation.

If you set the modem to RFC2684 bridge setting the IP address conflict goes
away so I suppose that sort of sorts the problem.

I think at the end of the day I need to get a good IT Company to come in and
give our system a once over.

Thanks for all you help.

Regards Bob

"Lanwench [MVP - Exchange]"
<(E-Mail Removed) hoo.com> wrote in message
news:(E-Mail Removed)...
> dbl <(E-Mail Removed)> wrote:
>> Ok the server was set up by an IT company (who are not around any
>> more)
>
> It would be a good idea for your company to look for another IT support
> company in your area, I suspect.
>
>
>> 2 NIC's when the server was purchased I was told this would
>> help speed thinks up. Unsure if teaming software was used. But when
>> both cables are plugged into the switch it does seem to make a
>> difference when large amount of data are moving around the network
>
> If this is true, then it must be using teaming software.
>
>>
>> you always had to unplug the old modem though.
>
> The modem? Why?
>>
>> DHCP sever is disabled on the 2003 server machine.
>
> You should enable it there - not on your router.
>
>> All work stations are set to automatic IP address.
>> The old modem router was set as the DHCP server, unable to get any
>> data from it, so unsure how it was set up.
>
> You can figure out what you need based on the ipconfig /all from the
> server.
>
>> The modem is connected to a Netgear switch and is also set as DHCP
>> server.
>
> So you have a dynamic public IP address? Meaning, your modem will give an
> IP address to the Netgear, and the Netgear will have a static/private IP
> address.
>
>
>
>> Have not tried to set it up yet with the firewall, I just
>> wanted to see if it would connect to the net, which it did.
>> The modem will be connected to a Netgear firewall then the switch
>> when this problem is resolved.
>
> Don't connect without the firewall in place even for a nanosecond.
>
>
>> Is the ActiveDirectory where all the users are set up, where you can
>> add or delete users change passwords etc, if so yes, if not where do
>> I go to find out?
>
> Yes, it is.
>>
>> Sorry but is it safe to post the IP addresses?
>
> Yes, it should be fine. Especially since this is private / nonroutable IP
> address info.
>
>>
>> Thanks Bob
>>
>> "Lanwench [MVP - Exchange]"
>> <(E-Mail Removed) hoo.com> wrote in
>> message news:%(E-Mail Removed)...
>>> dbl <(E-Mail Removed)> wrote:
>>>> Hi I have just purchased a Netgear modem and FVS 338 firewall to
>>>> connect our network to the internet (old router packed up, all
>>>> working ok before this happened) I set up the modem to connect to
>>>> the internet (without the firewall to make sure it would connect)
>>>> and all the computers connected to the network lost their
>>>> connections to mapped drives on the server. When restarting the
>>>> server it comes up with an error message that there is an IP
>>>> address conflict. How do I go about sorting this problem?
>>>> The modem connects to a Netgear switch and the sever runs on Windows
>>>> Sever 2003 Std edition.
>>>>
>>>> Also the sever has 2 network cards which works OK with them both
>>>> plugged into the switch until you plug the modem into the switch
>>>> then you get an error message on the 2nd network card on the server
>>>> which basically disables this card. What do I need to do to set it
>>>> up properly?
>>>> Please don't forget I am new to this so please don't get to
>>>> technical. Thanks Bob
>>>
>>> Well, I'll try, but this is technical stuff. Who set up the original
>>> server/network?
>>>
>>> Did you set the Netgear firewall's LAN IP to match the LAN IP you
>>> were using on your old router/device?
>>>
>>> Are you using ActiveDirectory?
>>>
>>> Why does your server have two NICs?
>>>
>>> Post an unedited ipconfig /all from the server and one workstation.
>>> Do this in a command prompt -
>>>
>>> ipconfig /all >c:\filename.txt
>>>
>>> ...then copy/paste the output here, clearly labeling which is the
>>> server & which is the workstation.
>
>
>

dbl <(E-Mail Removed)> wrote:
> If you set the modem to RFC2684 bridge setting the IP address
> conflict goes away so I suppose that sort of sorts the problem.

I guess so.....but does that mean you're up and running?
>
> I think at the end of the day I need to get a good IT Company to come
> in and give our system a once over.

That sounds wise

>
> Thanks for all you help.

You're most welcome - hope it was useful.
>
> Regards Bob
>
> "Lanwench [MVP - Exchange]"
> <(E-Mail Removed) hoo.com> wrote in
> message news:(E-Mail Removed)...
>> dbl <(E-Mail Removed)> wrote:
>>> Ok the server was set up by an IT company (who are not around any
>>> more)
>>
>> It would be a good idea for your company to look for another IT
>> support company in your area, I suspect.
>>
>>
>>> 2 NIC's when the server was purchased I was told this would
>>> help speed thinks up. Unsure if teaming software was used. But when
>>> both cables are plugged into the switch it does seem to make a
>>> difference when large amount of data are moving around the network
>>
>> If this is true, then it must be using teaming software.
>>
>>>
>>> you always had to unplug the old modem though.
>>
>> The modem? Why?
>>>
>>> DHCP sever is disabled on the 2003 server machine.
>>
>> You should enable it there - not on your router.
>>
>>> All work stations are set to automatic IP address.
>>> The old modem router was set as the DHCP server, unable to get any
>>> data from it, so unsure how it was set up.
>>
>> You can figure out what you need based on the ipconfig /all from the
>> server.
>>
>>> The modem is connected to a Netgear switch and is also set as DHCP
>>> server.
>>
>> So you have a dynamic public IP address? Meaning, your modem will
>> give an IP address to the Netgear, and the Netgear will have a
>> static/private IP address.
>>
>>
>>
>>> Have not tried to set it up yet with the firewall, I just
>>> wanted to see if it would connect to the net, which it did.
>>> The modem will be connected to a Netgear firewall then the switch
>>> when this problem is resolved.
>>
>> Don't connect without the firewall in place even for a nanosecond.
>>
>>
>>> Is the ActiveDirectory where all the users are set up, where you can
>>> add or delete users change passwords etc, if so yes, if not where do
>>> I go to find out?
>>
>> Yes, it is.
>>>
>>> Sorry but is it safe to post the IP addresses?
>>
>> Yes, it should be fine. Especially since this is private /
>> nonroutable IP address info.
>>
>>>
>>> Thanks Bob
>>>
>>> "Lanwench [MVP - Exchange]"
>>> <(E-Mail Removed) hoo.com> wrote in
>>> message news:%(E-Mail Removed)...
>>>> dbl <(E-Mail Removed)> wrote:
>>>>> Hi I have just purchased a Netgear modem and FVS 338 firewall to
>>>>> connect our network to the internet (old router packed up, all
>>>>> working ok before this happened) I set up the modem to connect to
>>>>> the internet (without the firewall to make sure it would connect)
>>>>> and all the computers connected to the network lost their
>>>>> connections to mapped drives on the server. When restarting the
>>>>> server it comes up with an error message that there is an IP
>>>>> address conflict. How do I go about sorting this problem?
>>>>> The modem connects to a Netgear switch and the sever runs on
>>>>> Windows Sever 2003 Std edition.
>>>>>
>>>>> Also the sever has 2 network cards which works OK with them both
>>>>> plugged into the switch until you plug the modem into the switch
>>>>> then you get an error message on the 2nd network card on the
>>>>> server which basically disables this card. What do I need to do
>>>>> to set it up properly?
>>>>> Please don't forget I am new to this so please don't get to
>>>>> technical. Thanks Bob
>>>>
>>>> Well, I'll try, but this is technical stuff. Who set up the
>>>> original server/network?
>>>>
>>>> Did you set the Netgear firewall's LAN IP to match the LAN IP you
>>>> were using on your old router/device?
>>>>
>>>> Are you using ActiveDirectory?
>>>>
>>>> Why does your server have two NICs?
>>>>
>>>> Post an unedited ipconfig /all from the server and one workstation.
>>>> Do this in a command prompt -
>>>>
>>>> ipconfig /all >c:\filename.txt
>>>>
>>>> ...then copy/paste the output here, clearly labeling which is the
>>>> server & which is the workstation.

Yes I am up and running and thanks again it was very useful.
"Lanwench [MVP - Exchange]"
<(E-Mail Removed) hoo.com> wrote in message
news:(E-Mail Removed)...
> dbl <(E-Mail Removed)> wrote:
>> If you set the modem to RFC2684 bridge setting the IP address
>> conflict goes away so I suppose that sort of sorts the problem.
>
> I guess so.....but does that mean you're up and running?
>>
>> I think at the end of the day I need to get a good IT Company to come
>> in and give our system a once over.
>
> That sounds wise
>
>>
>> Thanks for all you help.
>
> You're most welcome - hope it was useful.
>>
>> Regards Bob
>>
>> "Lanwench [MVP - Exchange]"
>> <(E-Mail Removed) hoo.com> wrote in
>> message news:(E-Mail Removed)...
>>> dbl <(E-Mail Removed)> wrote:
>>>> Ok the server was set up by an IT company (who are not around any
>>>> more)
>>>
>>> It would be a good idea for your company to look for another IT
>>> support company in your area, I suspect.
>>>
>>>
>>>> 2 NIC's when the server was purchased I was told this would
>>>> help speed thinks up. Unsure if teaming software was used. But when
>>>> both cables are plugged into the switch it does seem to make a
>>>> difference when large amount of data are moving around the network
>>>
>>> If this is true, then it must be using teaming software.
>>>
>>>>
>>>> you always had to unplug the old modem though.
>>>
>>> The modem? Why?
>>>>
>>>> DHCP sever is disabled on the 2003 server machine.
>>>
>>> You should enable it there - not on your router.
>>>
>>>> All work stations are set to automatic IP address.
>>>> The old modem router was set as the DHCP server, unable to get any
>>>> data from it, so unsure how it was set up.
>>>
>>> You can figure out what you need based on the ipconfig /all from the
>>> server.
>>>
>>>> The modem is connected to a Netgear switch and is also set as DHCP
>>>> server.
>>>
>>> So you have a dynamic public IP address? Meaning, your modem will
>>> give an IP address to the Netgear, and the Netgear will have a
>>> static/private IP address.
>>>
>>>
>>>
>>>> Have not tried to set it up yet with the firewall, I just
>>>> wanted to see if it would connect to the net, which it did.
>>>> The modem will be connected to a Netgear firewall then the switch
>>>> when this problem is resolved.
>>>
>>> Don't connect without the firewall in place even for a nanosecond.
>>>
>>>
>>>> Is the ActiveDirectory where all the users are set up, where you can
>>>> add or delete users change passwords etc, if so yes, if not where do
>>>> I go to find out?
>>>
>>> Yes, it is.
>>>>
>>>> Sorry but is it safe to post the IP addresses?
>>>
>>> Yes, it should be fine. Especially since this is private /
>>> nonroutable IP address info.
>>>
>>>>
>>>> Thanks Bob
>>>>
>>>> "Lanwench [MVP - Exchange]"
>>>> <(E-Mail Removed) hoo.com> wrote in
>>>> message news:%(E-Mail Removed)...
>>>>> dbl <(E-Mail Removed)> wrote:
>>>>>> Hi I have just purchased a Netgear modem and FVS 338 firewall to
>>>>>> connect our network to the internet (old router packed up, all
>>>>>> working ok before this happened) I set up the modem to connect to
>>>>>> the internet (without the firewall to make sure it would connect)
>>>>>> and all the computers connected to the network lost their
>>>>>> connections to mapped drives on the server. When restarting the
>>>>>> server it comes up with an error message that there is an IP
>>>>>> address conflict. How do I go about sorting this problem?
>>>>>> The modem connects to a Netgear switch and the sever runs on
>>>>>> Windows Sever 2003 Std edition.
>>>>>>
>>>>>> Also the sever has 2 network cards which works OK with them both
>>>>>> plugged into the switch until you plug the modem into the switch
>>>>>> then you get an error message on the 2nd network card on the
>>>>>> server which basically disables this card. What do I need to do
>>>>>> to set it up properly?
>>>>>> Please don't forget I am new to this so please don't get to
>>>>>> technical. Thanks Bob
>>>>>
>>>>> Well, I'll try, but this is technical stuff. Who set up the
>>>>> original server/network?
>>>>>
>>>>> Did you set the Netgear firewall's LAN IP to match the LAN IP you
>>>>> were using on your old router/device?
>>>>>
>>>>> Are you using ActiveDirectory?
>>>>>
>>>>> Why does your server have two NICs?
>>>>>
>>>>> Post an unedited ipconfig /all from the server and one workstation.
>>>>> Do this in a command prompt -
>>>>>
>>>>> ipconfig /all >c:\filename.txt
>>>>>
>>>>> ...then copy/paste the output here, clearly labeling which is the
>>>>> server & which is the workstation.
>
>
>