Linux box
Hi all, we actually have two lines connecting us and our services to the
Internet, a 2 mbit payed on a per traffic base, and a 512K flat payed.
We have 32 IPs on the 2 mbit and 64 IPs on the second line. We cannot
reconfigure or access the router. We would like to setup a linux box to
create a "bridge" between the two networks so that the traffic that goes
from one network to the other does not pass to the internet (i.e. we
have a backup mail server and a backup dns server for net2 in net1.
I would like that the messages being handled by the backup mail server
pass through the linux box and not through the 2mbit line, once they
arrived to the backup mail server, to avoid paying twice the traffic.
The same goes for data backup, even if in this case i can put two NICs,
one on each net)
I know it's as easy as putting a static route on the router, pointing to
the linux box. But we cannot access the routers =( I also thought about
putting the route into the routing table of the mail servers. This
solves the problem, but we have to put the route pointing from net1 to
net2 and vice versa in each server, and we have a couple of server which
are not ours and i cannot access and modify they're routes.
I also thought about using the linux box as default gateway for each
server in each net, and it works, but it work this way:
Net1--------------Linux----------------Net2
|
Router1-------------+------------------Router2
Net1 and Net2 can share the traffic between them without accessing the
Internet. If linux box has router 1 as default gateway all the traffic
to the internet is routed through router1, same goes for router2 if
router2 is the default gateway for the linux box. This is correct and
works.
What i would like to know is: Is it possible to configure the Linux box
to route all the traffic originated from net1 and destined to the
Internet through router1 only, and route all the traffic originated
from net2 through router2 only?
We also need traffic shaping and accounting, but as i see once we set up
the linux box to handle the traffic, we can also account and manage it!
I thought about various setup, a possible one would be using the
bridging function of linux, but i understand it would work and solve the
problem of firewalling and managing traffic for each net without
reconfiguring the routers, not the "routing" problem.
One last question: since we have two lines we would like to be able to
use them each one as backup (i.e. if line1 goes down traffic is rerouted
through line2)
As i understand we need to be an Autonomous System to do this, and the
two routers must be configured using BGP or some other dinamic routing
protocol, is this correct?
Thank you very much if any of you could help, or point to some links and
documentation we can study and apply!
Riccardo
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