Hi All,
We are planning to do some upgrade in our network. The present network
has one vyatta router and two internet connections (one is 1Mb leased
line and the other is 2Mb Broadband), Since the broadband connection
is limited, we are manually changing the default gateway
* The leased line connection is all traffic till 11 AM (it is set to
the default gateway)
* After 11:00AM, we switch the default gateway to the broadband
connection for all internet traffic, and add a static route so that
VPN traffic remains on the leased line.
* After 5:00PM, we reset this back to the original configuraton
Here are the drawbacks of the system we currently use:
* Requires manual shifting of routes (twice a day)
* If the leased line connection goes down then we have to remove the
static route and restart the VPN process so that it utilizes the
broadband connection
* If the broadband connection goes down between 11-5, then we have to
switch the default gateway to the leased line.
In an attempt to fix these issues we were thinking about something
like the below diagram (3 Router setup) and utilize dynamic routing
protocols.
Router A (ISP1-Leased Line)
Router B(ISP2-Broadband)
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Router C
(Connected to LAN)
The first idea we had was to configure Router A and B so that both
servers have the VPN process started (so both can reach the server).
This way there are two paths to reach the same destination. We were
then planning on setting the cost of the VPN route through Router A as
the lowest cost so that is used by default. If Router A goes down,
then Router C knows to automatically route VPN traffic from the LAN to
Router B. Can we use OSPF to perform this?
The second idea that we would like to try is to modify route cost
based on time of day. For example, between 11-5, we want Router C to
shift Internet traffic from Router A to Router B with the exception of
VPN. Can this be done by utilizing OSPF? What is the best way to
update the cost dynamically? Is there a way to do it within Vyatta
OFR or do we need to utilize a bash/perl script? Has anyone created
rules like this that take into account bandwidth or latency?
Any suggestions that can be offered about this architecture would be
great before we start testing this.
Thanks
Abhilash S
Ascella Technologies, Inc
www.ascellatech.com
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