Connecting two servers to each other

Posted on 2005-04-13
Last Modified: 2010-04-26
I just purchased two dell poweredge servers, each with two network ports.  My question is, I currently have one server running and would like to replace with these two.  I am assigned one master IP address with another block of 25 ip addresses that all point to the one server.  Since i am currently running my own DNS server on the machine i currently have and will be running DNS again on the new machine, is it possible that i can simply use an ethernet cable and connect the two servers directly to each other?  Or do i need have a new line run by the Colocation facility, and if so, can i simply assign the second server one of the IP addresses in the block that i have?

Any help would be greatly appreciated, i have looked all over the web, but unable to find anything.

Question by:ondrejko1
    LVL 7

    Expert Comment

    Well, you can connect both using a crossover cable. It works. Then you can fine tune ussing a "route add" command.

    You can have either schema, but you don't need to do so. A multihomed machine could bring more problems than benefits. Specially with windows.

    My recomendation:
     * Lay FOUR cables to the switch (one for backup). The bill is going to be almost the same.
     * Connect both nic's, but disable one and let it be the "backup" line (well, you can try using both for redundancy of query balance)
     * If you have a very heavy traffic between your two servers (very heavy), then and only then consider using a crossed cable to connect both, but with an internal IP (ie, 192.168.x.x), and issue a route add. Most probably you will have to modify the card metric.

    Author Comment

    The reason we are using two servers, one is going to be the web server, the other a database server.  I guess it would just make sense to get a new line run to it, that way i can remote connect to it easily without having to hop to one machine, then to the other, etc..

    Any other suggestions?
    LVL 7

    Accepted Solution

    The Dell machines probably have a 1000BT NIC's. You can get a small switch with 1000BT ports for them. Is the more manageble solution. Is going to add a small delay, but no so much. But yes, you can use a crossover cable and it will work.

    You can experience problems of data packets going to the internal nics instead of the Internet one. Is something that will require some tunning, but is a solution that some enterprises have.

    Go ahead: Worst case, get some money for a 1000BT switch, or ask for a second line. And TEST.
    LVL 13

    Expert Comment

    I would run new lines and use load balancing on the network cards.  I would also share the FSMO rules and allow each machine to share responsibility.  This would also allow updates and reboots without taking the entire system down, like you would have to if they were routed to each other.  

    Author Comment

    yep, got a linksys switch from best buy and all is well.

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