[ale] fallover DSL connection?

[Dow Hurst]

Chris,
Can you have the Linux box as the gateway the clients see all the time? 
Have the T1 and the DSL as interfaces on the linux box and just switch
between them as necessary?  You could have the Cisco router as the linux
box'es gateway to the other office.  The Cisco VPN would be transparent
to the linux box.  When the Cisco router's link to the Internet died
(ISP problems and such) then you could have the Linux box failover to a
SSH PPP based VPN to the other office thru the DSL link.
Dow


Chris Bergeron wrote:
> 
> Hi guys, I'm having a bit of a dilemma here...  On my network, I have 2
> offices connected via VPN over T1 connections to the 'net.  What I'm
> trying to do is setup a DSL fallover such that should either office lose
> it's T1 to the internet, that office could begin routing to the internet
> via to DSL.  I'm just not sure how to tell the clients to use the new
> gateway if the original one goes down.  We're using DHCP by-the-way.
> Should I point the clients at a linux server that acts as a switch
> (think railroad switch, not Ethernet switch).
> 
> A'la:
> 
> Clients -> intermediary linux box -> Cisco router/VPN -> Internet
> 
> Such that should the T1 go down, the ILB (intermediary linux box) could
> route packets out the DSL linux router...?
> 
> Is this the best way to go about this?  The part that concerns me is
> that the T1 VPN can't play nice with the DSL linux VPN; sooo... both
> points would have to switch should only one side go down.  Should I just
> drop the CISCO router/VPN and go with a linux only solution?  Doing so
> would allow me to have only the satellite office that whom's T1 goes
> down, switching their 'net connection.
> 
> Triumphs? Or Tribulations? from anyone that's done this?
> 
> Much respect,
> CB
> 
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Dow Hurst                   Office: 770-499-3428
Systems Support Specialist  Fax:    770-423-6744
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Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
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