Internet with 2 ISP

  • Thread starter Thread starter gfexrd
  • Start date Start date
G

gfexrd

Hi,
I want to connect my local LAN with Internet throught 2 ISP.

My configuration is:

------------------
| Local LAN |
| 192.168.0.x |
------------------
|
|
|
|
| 192.168.0.1 - NIC 1
----------
| Server | Windows 2000 Server
| |
----------
10.0.0.1 - NIC 3 | | 200.10.10.10 - NIC 2
255.255.255.252 | | MASK 255.255.255.248
10.0.0.2 | | GATEWAY 200.10.10.11
| |
| |
| |
/----------------\
/ INTERNET \
/ \


NIC 2 and NIC 3: Configuration provided by my ISP.

I am doing NAT in the Server, on NIC 2 and 3, and want to filter
packets in order to route for one ISP or another.

I dont have any problem when I connect with NIC 2 but when I enable NIC
3, iternet stops. I tried with Metric but it didnt work.
Is this possible?
What is wrong?

Thanks in advance.
 
Gfexrd,

Can you get each connection to work when it is the only one? I know that
might sound a bit simple, but it is a good idea to verify that they are all
working before doing something complicated.

From there can you post your routing table and the ipconfig /all from each
of these connections?
 
Thanks for your reply.
I can connect with NIC 2 or NIC 3 without problems, but when I have
both NIC configured I can not .

Here are my routing table/ipconfig:
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface
Metric
0.0.0.0 0.0.0.0 10.0.0.2 10.0.0.1
1
0.0.0.0 0.0.0.0 200.10.10.11 200.10.10.10
1
10.0.0.0 255.255.255.252 10.0.0.1 10.0.0.1
1
10.0.0.1 255.255.255.255 127.0.0.1 127.0.0.1
1
10.255.255.255 255.255.255.255 10.0.0.1 10.0.0.1
1
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1
1
192.168.0.0 255.255.255.0 192.168.0.1 192.168.0.1
1
192.168.0.1 255.255.255.255 127.0.0.1 127.0.0.1
1
192.168.0.255 255.255.255.255 192.168.0.1 192.168.0.1
1
200.10.10.09 255.255.255.248 200.10.10.10 200.10.10.10
1
200.10.10.10 255.255.255.255 127.0.0.1 127.0.0.1
1
200.10.10.255 255.255.255.255 200.10.10.10 200.10.10.10
1
224.0.0.0 224.0.0.0 10.0.0.1 10.0.0.1
1
224.0.0.0 224.0.0.0 192.168.0.1 192.168.0.1
1
224.0.0.0 224.0.0.0 200.10.10.10 200.10.10.10
1
255.255.255.255 255.255.255.255 192.168.0.1 192.168.0.1
1

Default Gateway: 200.10.10.11

===========================================================================
Persistent Routes:
None

IPCONFIG

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : server
Primary DNS Suffix . . . . . . . : xxxx.com
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : xxx.com

Ethernet adapter NIC3:


Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com EtherLink XL 10/100
PCI NIC
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.0.1
Subnet Mask . . . . . . . . . . . : 255.255.255.252
Default Gateway . . . . . . . . . : 10.0.0.2
DNS Servers . . . . . . . . . . . : 10.0.0.2


Ethernet adapter NIC2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com EtherLink XL 10/100
PCI TX (3C905B-TX)
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 200.10.10.10
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 200.10.10.11
DNS Servers . . . . . . . . . . . : x.10.0.115
x.10.0.116
NetBIOS over Tcpip. . . . . . . . : Disabled



Ethernet adapter NIC1:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com officeconnect NIC
(3CSOHO100)
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.0.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 192.168.0.1
Primary WINS Server . . . . . . . : 192.168.0.1
I made some changes in order to preserve public IPs.

Thanks again.
 
It won't work. Forget it.

157025 - Default Gateway Configuration for Multihomed Computers
http://support.microsoft.com/default.aspx?scid=kb;en-us;157025&Product=win2000

272294 - Active Directory Communication Fails on Multihomed Domain
Controllers
http://support.microsoft.com/default.aspx?scid=kb;en-us;272294

191611 - Symptoms of Multihomed Browsers
http://support.microsoft.com/default.aspx?scid=kb;EN-US;191611

Microsoft Windows XP - Multihoming Considerations
http://www.microsoft.com/resources/documentation/windows/xp/all/reskit/en-us/prcc_tcp_qpzj.asp?

You can however use one ISP as the Default to "unknown" destinations, but
use the other ISP for "specified" destinations.

But if you want "fault tolerance" or some kind of "load balancing" then you
need to use a NAT Device that has 2 WAN ports and is designed to handle 2
Internet connections. It would physicaly replace the location your Server is
in and the Server would be reconfigured with one NIC like the rest of the
machines on the LAN.

There is other specialized software that works in certain situations like
RainConnect from www.rainfinity.com
 
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