Our network works over our ISP's IP VPN cloud and we are running BGP. We have several sites connecting to our main area centre.
We have a device(eg laptop) at site X which connects to a device(laptop) at our HQ. If we make the device(site x) x.x.x.1 /30 and our router interface x.x.x.2 /30 and try to do a simple file share over the network the link is extremely slow,400 - 500bps, yet if we swap the IP's around,ie device x.x.x.2 and our router interface x.x.x.1, then the connection is fine. We are blaming our ISP and they are saying it's our configuration that is the problem. I have tried different routers and there is no difference. We had a CCIE at our office last week and he couldn't understand the problem!
All our links work over fibre and terminate on a Hauwei Echolife ONU.
Attached is a partial configuration of a router at one of our sites.
Is there anyone that has perhaps had a similar problem over IP VPN?
interface FastEthernet0/0 - TO ISP
ip address 10.1.1.2 255.255.255.252
interface FastEthernet0/1 - TO LAN
ip address 192.168.21.2 255.255.255.252
router bgp 65001
bgp router-id 10.1.1.2
neighbor 10.1.1.1 remote-as 64517
neighbor 10.1.1.1 activate
network 192.168.21.0 mask 255.255.255.252