02-20-2014 01:14 PM - edited 03-04-2019 10:23 PM
Hi all
We have 2 ISP routers from 2 providers, running bgp
I then have 2wan routers running Ospf , these connect to the ISP routers which also run Ospf to the LAN then bgp to the ISPs
What is the best way of pulling the internet traffic from the LAN to theses routers?
My thoughts are run default information originate on the ISP routers, as bgp will have a default route on each Ospf will then use this
Then redistribute Ospf into bgp
Is this the best way?
Would the traffic from the LAN get load balanced to each ISP router?
Am I right in saying without Ibgp between the ISP routers they wouldn't be intelligent enough to pick the closest route per ISP ?
02-20-2014 01:20 PM
Well to answer this i have a few questions.
1. Do you have a public network address range that you use?
2. If so, are these Provider Independent (ie you own them and can take them to a different ISP), or are the Provider Assigned(The ISP owns this block)
Do you want to load balance or have an Active/Standby setup?
02-20-2014 11:25 PM
Hello, Carl.
I agree with John - could you please share network diagram including IP-addresses per link (interface) and LAN?!
If you are using pribvate addresses somewhere, then what device[s] is doing NAT?
02-21-2014 05:11 AM
I would like to load balance
we have our own AS and PI block and are provider independant
firewall behind the devices are doing NAT and will point to a hsrp address of the wan routers
02-21-2014 05:34 AM
Carl,
So just to be sure, your LAN routers (The ones you own), are your firewalls connected directly to these two routers, and what are the addresses that these are all connected to? Are they on the same broadcast network? Please feel free to put dummy IPs to hide your real ones
02-24-2014 12:40 PM
Hi
Yes the firewalls are on the same subnet as the routers' they are all using public addresses
On the firewalls we point the default gateway to the hsrp address of the routers
Look forward to your replies
02-24-2014 12:58 PM
Car;,
The firewalls are on the same subnet as the routers?
So does your topology look like this?
ISP1 ISP2
| |
R1 R2
| |
(Firewall)
|
(Local Area Network)
02-24-2014 03:36 PM
Yes that is correct
02-24-2014 04:05 PM
Carl,
Sorry for all the questions. This part just confused me a little bit.
What is the best way of pulling the internet traffic from the LAN to theses routers?
My thoughts are run default information originate on the ISP routers, as bgp will have a default route on each Ospf will then use this
Then redistribute Ospf into bgp
What is the best way of pulling the internet traffic from the LAN to theses routers?
You could run 'default information-originate' command with OSPF, and have OSPF on your firewall (depending on how well this works). If you receive a default route via your eBGP neighbor from your ISP, then if your eBGP peer to ISP2 were to go down, this will not have the default route anymore, since it won't be listed, and OSPF should remove this.
You could configure two static default routes on the firewall, but if one ISP goes down, I"m not sure how this will affect the firewall, this would depend on the make and model.
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