I am using a cisco 2811 router.I am running short of Layer3 interface.
Can i use L2 interface on the router for connecting my LAN segment.
To explain in detail.
I have totally 4 L3interface on the router.
2 interfaces will be used for WAN connection
1 intercae will be used for internet connection
1 interface for HSRP
Now can i use the L2 interface for connecting my LAN segment and still have connectivity to 2WAN,Internet,HSRP
Yes you can do it. Consider HWIC-4ESW as a mini layer 3 switch with 4 ports. Now when you will add this card in ur 2811, you will see 4 L2 fastethernet ports. These ports are layer 2. So you need to create Interface Vlan 1 (SVI) and assign it your lan IP (which will serve as a gateway to your lan machines). Like this
Interface vlan 1
ip address 10.0.0.1 255.255.255.0
Now all the L2 ports of HWIC are part of vlan 1 and therefore part of this SVI.
Rate if helps