I have a 1811 router that I am trying to use to loadbalance internet connectivity over two ISP connections. It is the single box set up having the router as the Master and Border. The two routers attaching to the 1811 are performing the NAT translation, so only the prefix routing is being done by the 1811.
The setup works for about a minute and then stops internet access. DNS lookups still complete though so there is internet access. I cannot see from the config where this might be going wrong. Disconnecting one of the routers enables web browsing again, but this is expected. Config snippet below.
key chain OER key 1 key-string 7 12362025 oer master max-range-utilization percent 10 keepalive 1 logging ! border 126.96.36.199 key-chain OER interface Vlan10 internal interface FastEthernet1 external interface FastEthernet0 external ! learn throughput protocol tcp protocol udp periodic-interval 1 prefixes 200 expire after time 120 aggregation-type prefix-length 32 max prefix total 2500 no max range receive unreachable relative 500 backoff 180 360 mode route control mode select-exit best periodic 180 resolve loss priority 1 variance 1 resolve delay priority 2 variance 1 resolve utilization priority 3 variance 1 resolve range priority 5 ! ! oer border logging local Loopback0 master 188.8.131.52 key-chain OER active-probe address source interface FastEthernet0 ! !
! ! ! ! interface Loopback0 ip address 184.108.40.206 255.255.255.255 ! interface FastEthernet0 description ****WAN 1**** ip address 10.10.10.2 255.255.255.252 duplex auto speed auto ! interface FastEthernet1 description ****WAN 2**** ip address 10.10.10.6 255.255.255.252 speed auto full-duplex ! interface FastEthernet2 switchport access vlan 10 duplex full speed 100 spanning-tree portfast ! interface Vlan1 no ip address shutdown ! interface Vlan10 description ****Inside**** ip address 192.168.0.254 255.255.240.0 ip nat inside ip virtual-reassembly ! ip route 0.0.0.0 0.0.0.0 FastEthernet0
ip route 0.0.0.0 0.0.0.0 FastEthernet1
Any help appriciated
---- ISP #1 --- NAT box ---+ +--- 1st OER external (int f0) INTERNET Router --- LAN +--- 2nd OER external (int f1) ---- ISP #2 --- NAT box ---+
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