using crossover cable connect 2 servers that have 2 NICs

[Wen, Z]

Hi, All

I need help for this configuration.

one Compaq 9000 server (called A) in my company need to do full backup (SQL server 7.0)data file everynight to another Compaq 9000 server (called B), server A has 30 GB data file to load to B through company network, which takes more than 10 hours to do, and often backup fail.
server A and B have two network cards on each, and teaming two cards as visual one for loading balance.

To resolve often failed huge data file backup to another server
I am trying to using crossover cable directly connect server A and B.
what I have done:
1)drop network card teaming on both A and B. first network card on each server still connect to company network, both has own IP address
2)so both server have second network card free from dropping NIC teaming function.
I dircetly connect this two second network cards with crossover cable
3) assign new IP addresses (in same subnet)for both freed NIC
my qusetion are:
1) I can't ping each other with this two new assigned NIC that connect with crossover cable, I can ping gateway or other machine in network, what is wrong?
2) I want to transfer data from A to B through new assigned NIC IP address with crossover cable connected, how to configure, is there document I can find?
Note:
Server A and B must connect to company network, only second NIC on each server connect with crossover cable

thanks everyone help
email: wenhong_zy@hotmail.com

[John Meissner]

Have you checked to see if both 2nd cards are set at the same speed? 100 full duplex?

you already said they're on the same subnet ... they should be able to ping each other...

You could also buy a $40 linksys 10/100 hub and use regular cables... i know it's a little more effort... but It may be easier and faster than the crossover cable.

[Wen, Z]

both NIC have same speed 100 Mbps.
to buy something even if 40$, take long prcess

[Ron Kinner]

I suspect you have assigned an IP address that is in the same range as your existing network or that you have run into the subnet zero problem. Or else you did not break the teaming if you are trying to reuse one of the cards.

Since this is to be used for strictly internal connection we can use one of the private address spaces and choose one which will not run into the subnet zero problem. Pick one pair which is not being used in your network:

10.1.1.1,
10.1.1.2
mask 255.255.255.0

172.16.1.1,
172.16.1.2
mask 255.255.255.0

192.168.1.1,
192.168.1.2
mask 255.255.255.0

Now assign one address in the pair to box 1 and the other to box 2 and connect the two together with a crossover cable. (If reusing one of the teamed cards you need to break the teaming first.) The mask is always the same 255.255.255.0. If using any flavor of Windows do not assign a default gateway on this.

netstat -an

should show whether the new network is in the routing tables.

When you ping be sure and use the new IP address and not the host name.

We would need to know what OS you are running to give you more detailed instructions or point you to the correct howto.

For your original problem you should manually set the speed and duplex coding on both the servers and the switch and not rely on autonegotiate.

Ron