2 networ adapters, 2 gateways

Dear experts,

I have 2 servers connected to internet. Besides internet conectivity, there is another network adapter in each server. I need to set cross backup through that additional network adapters.

Example:

server-1 (internet connection)
IP: 192.168.0.2/24
GW: 192.168.0.1

server-2 (internet connection)
IP: 10.0.0.2/24
GW: 10.0.0.1

server-1 (cross backup connection)
IP: 192.168.254.1/24
GW: 192.168.254.1

server-2 (cross backup connection)
IP: 192.168.254.2/24
GW: 192.168.254.1

There is a cable directly connected to both "cross backup adapters", no switch.


My questions are:
1, is it supported scenario?
2, do I need to run route add command?
3, are there any disadvantages


Regards,
Jarda
LVL 7
Jaroslav LatalMSPAsked:
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bigbigpigCommented:
That should work, just make sure you use a crossover cable, not a standard straight through cable, to connect them to each other.  You also don't need to define a gateway if the 2 NICs are connected directly to each other.
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PhonebuffCommented:
If anything works I would be amazed based on your description.

I would suggest that you go to the pfSense Firewall site and read through the documentation on fail over and redundancy support,   www.pfsense.org 

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Tony GiangrecoCommented:
We have six servers, two ISP's and a Sonicwall TZ210 which handles all traffic from both web connections. I suggest setting this up with the firewall and not having Windows do it. We tried this before and could not keep it stable. From our experience, Windows is not well suited to handle this in a stable manner on a long term stable.
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Jaroslav LatalMSPAuthor Commented:
Hi,

Sorry about late response, we have a little flood here in Prague.

TG-TIS: What kind of unstability do you mean? We do not want to spend extra money if not necesstary.

bigbigpig: Thanks! We do not have crossover cable and it works in our "lab". Maybe newer functionality of our NIC. Do you use this scenario somewhere? Some complications?

PhonebuffPosted: Amazed? Do you have any real experience with this? :)


Regards,
Jarda
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PhonebuffCommented:
I guess,

    Redundant Firewalls, with redundant Switches with 9 servers with Dual NICS in a Colocation facility rack and zero down time in five years.

    Most NICs and the switch technology these days are auto sensing so no you don't need a cross over cable..

    But you need to do some reading on Load balancing and redundant links.   Again there is good information on the net at pfSense.org and other open source firewall products sites.
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Jaroslav LatalMSPAuthor Commented:
I tried this and it works with no GW defined. The only problem is slower printing. I hope nothing else will appears.

regards,
Jarda
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