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plz help with dual internet link setup

By IT Den ·
story is:
office; 4 departments.
some problems with our ISP
we want to transfer one of the departments on other ISPs internet link.

network: cisco1841 , firewall Fortnet/fortigate
Windows server 2003:DC, AD, DNS, DHCP

scheme is:
global IP <=cisco=> 192.168.4.0 (unfirewalled network;PBX) <=fortigate=> 192.168.3.0 (internal firewalled network: DC, workstations)

so how it's possible to transfer only one department out of 4 to other ISP link, BUT(!) leave it in one domain AD??????

cisco has only 2 ports, in my case wan/lan
Firewall has 2 WAN ports.

So how it's possible to leave all the deps in one domain, use same old network resources?
How to switch networks, in dep, if one of the links are down, easily ?

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All Answers

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This looks so much like a class question it's not funny

by Deadly Ernest In reply to plz help with dual intern ...

please try and convince us you aren't seeking help with a homework assignment.

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No, it's actual real situation at my office

by IT Den In reply to This looks so much like a ...

no no. it's real situation at my office

boss wants(!) and he don't care how.

so I've to find some solution with this scheme, some other possible solution for two lines of internet in office or weighty argument to forget this idea about simultaneous links together with one DC

I'm familiar with cisco and win2kr environment, but not superb specialist

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subnetting/ gateways

by CG IT In reply to No, it's actual real situ ...

Ff you want to have some workstations use another gateway, to the internet, you have to tell them to use another gateway. that includes the second ISP DNS servers used to get to the internet. Basically have to create a site in AD for these clients and place them in a different subnet to get this to work, even though their physical location is in the same building or even same office space. They use only the second DSL line to get to the internet and use the AD sites and services links for Active Directory.

will have to do some fancy routing on the LAN. hope you use cisco switching.

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thank you

by IT Den In reply to subnetting/ gateways

i think Ur answer covers 70-80% of problem.
will check Ur suggestion more closely

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well what I suggest is simply making those

by CG IT In reply to thank you

computers you want to use the second DSL line like an office in a remote location that doesn't have a Domain Controller. They gain access to the network and logon over a WAN link.

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This site might help with your dual internet connections....

http://forums.isaserver.org/m_2002056781/mpage_1/key_/tm.htm#2002058748

Please post back if you have any more problems or questions.
If this information is useful, please mark as helpful. Thanks.

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