The issue i'm having is that i have two subinterfaces configured on my 2611XM router however i get no response from hosts on the LAN's unless the subinterface is specified as the native vlan. Is that right? i thought you could have as many subinterfaces as you wanted and could communicate between all networks and hosts no problem? I've attached a copy of the config and a network diagram.
Any help would be appreciated.
You didn't mentioned whether you are using any vlans in your network. If yes you need to provide the vlan id after the encapsulation command encapsulation dot1Q XX.
You need to make the port as trunk on the switch which is connecting to the router.
interface FastEthernet x/y
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,x,y
switchport mode trunk
If your LAN is a flat network without any VLANs then you dont need subinterfaces, instead you can add the ip addresses as secondary on the main interface..
ip address 126.96.36.199 255.255.255.224
ip address 188.8.131.52 255.255.255.248 secondary
Pls rate if it helps