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Network Layout & Load Balancing Multiple Broadband Connections

Hi,

There are two companies which wish to load balance their internet connections together so they can all utilise faster internet browsing and protect themselves from outages.

The problem is they are two separate networks with their own DNS and DHCP servers for the local network.

There is a product called a TP-Link TL-R470T+ Load Balance Broadband Router, if i purchased this item would i be able to achieve what i have put in the diagram.

The splitting the network into segments isnt so much of an issue but would the router mentioned above (the Load Balance Router) in the diagram attached be able to forward port traffic from ports 25, 80 etc (what ever port specified) on the red connection to the red server and the port forwarding from the blue connection to the blue server.

Basically, if the port 25 traffic comes from router 1, will the load balance be good enough to know that it should forward it to domain1 server, and the same with router2 and domain2 server?

Thanks for your help!
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net-workx
Asked:
net-workx
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net-workxAuthor Commented:
sorry - see attached diagram
Network-Layout.pdf
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mrklaxonCommented:
We use a Barracuda Link ballancer to do what you are describing except we don't split the inside traffic.  What you are describing should work if the solution from TP-Link supports it (mainly the inside redirect).  Inside to outside services are easy as the balance router can pick the outbound path automatically as long as the destination doesn't care about the source IP.  Inbound is another story.  For example, inbound email for company A DNS resolves to router A's IP address.  If ISP A goes offline then there is no way to get to that IP through ISP B.  Barracuda's answer is to make it's appliance the authoritative DNS so that it can change the IP resolved and route mail through another IP.  We have only partialy enabled this and have mail routing through an outside service that handles failover.  You can also setup BGP with ISPs to allow routing of subnets through multiple paths but that is probably beyond your needs or pricing not to mention too complex.  Looking for other info or specifics on the TL-R470T?
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mrklaxonCommented:
I should also point out that inbound mail is just one issue.  Outbound mail needs to have the proper DNS records or you may be marked as SPAM for comming from an IP that isn't in your records.  VPN connections need to know how to react to different routes.  etc.
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net-workxAuthor Commented:
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net-workxAuthor Commented:
understand completely what your saying about the incoming traffic.  Im not to worried about as mail gets queued up on the mcafee servers and passed through to us when we are back up and running and VPN and HTTP inwards are minimal.  Its more a case of being able to use the internet from internal which i wanted to try and make more redundant but also to speed up internet access for all internal people as well.

Ive had a look through the documentation but it doesnt seem like im going to be able to split the traffic again once its come through the load balancer - would you agree?
20111513583010.pdf
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AIC-AdminCommented:
You may want to call the manufacturer... most companies will provide free configuration help to get the sale.. they may be able to tell you how others acheive dual ISPs with their products.
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net-workxAuthor Commented:
thanks, ill give it a go!
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mrklaxonCommented:
Multiple LAN ports but looks like they are tied together.  Nothing in the firewall setting shows you can limit LAN to LAN either.
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net-workxAuthor Commented:
as i thought - ill double check with the manufacturer and come and assign points once i have the answer from them!  doesnt look like im going to be able to though :(

one last idea however... does anyone know if untangle server would be able to do this function?  sao take the load balance router out of the equation and put the untangle server in its place?

thanks
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