2IPS’s, 2 routers (1 router per each ISP) connected 8 workstations through 2 L1-switches – will this work?

Microsoft Windows XP
Network Configuration
2 IPS's, 2 routers (1 router per each ISP, diferent LAN-subnet on each router) connected to 8 workstations (through 2 L1-switches) - will this work? (it does actually work but with disruptions)? 2 ISPs are required in case one IPS's connection is down. Thequestion is will the other ISP's connection kick in automatically if I just add extra IP, Gateway, DNS on each workstation for them to be connected to both router's LANs (like i said it actually does work but with disruptions? the topology is:
ISP1->router1 wanport->
--> 8portswitch -> 16portswitch -> workstations
ISP2->router1 wanport->
the workstations have only one ethernet adapter each. if this is not possible, will it work if the 2nd ISP's connection is brought in through a second ethernet adapter on workstations and there is no physical link between the 2 routers: each workstation - member of 2 LANs

Software/Hardware used:
WinXP, 2 D-Link DIR100 routers, 8-port L1 switch, 16port L1 switch

Answer Wiki

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I don’t know your router D-Link DIR100 have 2 WAN port or not, if its have 2 WAN port try clustering. Otherwise, install an ISA server with 3 network cards, use 2 cards for input line from ISP and the rest is going to be output to the switch, LAN.

There are two clustering technologies.
The first, called the Cluster service, is used to link individual servers so they can perform common tasks. If one server stops functioning, its workload is transferred to the other server.
The second clustering technology, called Network Load Balancing (NLB), is used to make sure a server is always available to handle requests.

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  • Eager2knowlan
    much obliged for your comment!!! if the router had 2 wan ports there would not have been a problem at all. ok, so its only through a server-machine with 3 NICs that two ISP's can distributed into LAN simultaneously. what about adding some extra routes to the routing table on the workstations (the routes under additional ip to be directed to the 2nd router)??? and to elaborate further on the routing table - all the entrances there have the same value as interface - the default IP address - is there any way to add an extra interface with different IP address on the same NIC into the routing table? in other words how is an extra IP address (defined in the network settings next to primary one) handled by the machine and the network (the original idea was: internet down on 1st router - workstations use 2nd IP and 2nd default gateway defined in the net settings to ask for internet from the 2nd router, which is the 2nd default gateway). by the way, where can i find the correct syntaxis for the "if" option of the "route add" command (what should i enter after if - it will not accept the IP as interface definition). thanks in advance for all the comments.
    35 pointsBadges:
  • SiThu
    Eager2knowlan, I am not good at ISA configuration, but there was a way in this link. You can find "Load balancing between two ISP links option". I hope this will help you. Regards SiThu
    450 pointsBadges:
  • Cybernorris
    Your internal systems must have a single gateway addresss. Something at that point must have the intelligence to understand line up/down and provide the ability to fail over between outbound ISP routes. I personally think ISA is overkill... no need for the expense of a server and the licenses required. Fortinet (and probably others) have firewall type appliances that are able to handle this with ease and even provide some level of load balancing.
    50 pointsBadges:
  • Eager2knowlan
    If there must be only a single gateway addresss, why is there an option in network settings to enter additional default gateway addresses? (this works perfectly with a CISCO router having 2 LAN subnets defined on it - when you enter additional default gateway address on a workstation it gets access to the second LAN subnet defined on the router).
    35 pointsBadges:
  • Eager2knowlan
    "firewall-type appliances" is to broad for me, sorry. can you please be more specific, i.e. give the name of the application I could use. thanx
    35 pointsBadges:
  • Net1Worker
    You can use HSRP or VRRP for redundancy. It's better to use GLBP that will do load sharing as well.
    90 pointsBadges:

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