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Server Second nic causes ping to fail

Posted on 2013-05-28
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Last Modified: 2016-11-23
Windows 2003 R2 Enterprise Edition SP2 all updates.
This server is used for VPN accces running ISA PPTP
This server replaced an old server running Windows 2003 with two nics that one worked no problem

A Dell PowerEdge 860 with two embedded nics
When both nics are enabled I am unable to ping any network address.
Both nics are on the same subnet.
Nic 1  ip          192.168.1.22
           sm     255.255.255.0
           gw      192.168.1.1
           DNS    192.168.1.10
                       192.168.1.15  

Nic 2  ip        192.168.1.23
           sm       255.255.255.0
           gw        NONE
           DNS     192.168.1.10
                        192.168.1.15

With the nic enabled I can not vpn in was getting 718 errors.

So then I started testing

ping fails to ping any address on the local network

Then tried from another computer

ping servername to test dns.

it failed it was using the ip address of the second nic

In the properties of the second nic I do not have checked register this ip address in DNS
that is unchecked.
Only for Nic 1 I have that checked.

But when I looked at my DNS records both ip addresses were listed in the zone

I tried to ipconfig /flushdns no luck.

So no I have nic 2 disabled and all is working for the network

I need the second nic for the vpn traffic.

I compared all the settings from the old computer

Do not see what I am missing here.
         
Any ideas or suggestions
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Question by:Thomas Grassi
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by:smckeown777
ID: 39201132
Why are you using 2 NIC's exactly? Also they are on the same subnet...which doesn't make sense

Normally if you are using 2 nics you have a Public and a Private nic - the public is connected to your modem/router and the private to your internal lan...again in different subnets...so i'd check the config on the previous server just to verify those settings...having them in the same subnet doesn't make sense...
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by:Thomas Grassi
ID: 39201183
I read that IAS requires two nics.

I only have one network segment.

I only have one Cisco router.

I only have one static ip address.

The old server has the exact same settings for both nics.

Do not understand why it worked on that server and not this one.


If I can run IAS with one nic then that is ok too.

I can just change my cisco static for pptp to point to nic 1 instead on nic 2


Opps I mean IAS not ISA    typo
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by:smckeown777
ID: 39201227
Ok, how was the old server connected exactly? Like so?

Cisco -> ServerNIC1(Public)
ServerNIC2 -> LAN switch

Normally with 2 nics that's how things are connected...so the server becomes a router as such...was this how the old server was setup?

What version ISA is this? 2003?
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by:Thomas Grassi
ID: 39201285
ServerNIC 1 Lan switch
ServerNIC 2 Lan switch

Not sure how it worked before

IAS not ISA   on windows 2003 server
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by:smckeown777
ID: 39201480
Right, IAS...that's why I asked as I never used ISA before...

Ok well that won't work as is, since both nics are connected to the LAN and on the same subnet...which is why you are losing connection to server

IAS can be run on one nic - have you walked through the setup of the product at all? It creates the VPN connections for you

To do so with the built in VPN server (RRAS) you will need to select the 'custom' option during the wizard this will then let you setup a VPN that can be configured with all you need.
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smckeown777 earned 500 total points
ID: 39201573
Here's a good guide to assist if you get lost...
http://www.devtoolshed.com/content/windows-server-2003-configure-rras-routing-and-remote-access-service-site-site-vpn

Again I'd love to know how the other server was setup...can't see how it worked at all using those settings
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by:Thomas Grassi
ID: 39201612
Thanks for the info

I will check things out tonight

I would love to know how it worked on the old server also.
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Author Closing Comment

by:Thomas Grassi
ID: 39204253
moved RRAS to the main nic NIC 1 now able to VPN in again.
Still do not understand why my other Windows 2003 server worked with two nics on the same lan. That's for another day.
Going to look into load balancing now to utilize the other nic.

Thanks again.
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by:smckeown777
ID: 39204798
Great, glad you are working...

As for the 2 nics in old server - are you 100% sure that they were BOTH connected to the LAN? Maybe the ip was assigned to the nic but it was either disconnected or disabled?

Because there's simply no way it would work that I can think of!!
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