SOURCE: How to create subinterfaces on a 3845 series cisco router
Its like router on stick configuration??enter the interface which you have to configure and in that interface as mentioned below
Hostname(config)#interface FastEthernet0/1
Hostname(config-if)#no ip address
Hostname(config-if)#no shutdown
Hostname(config)#interface FastEthernet0/1.1
Hostname(config-if)#encapsulation dot1Q 1 native
Hostname(config-if)#ip address x.x.y.y < subnet mask >
interface FastEthernet0/1.2
Hostname(config-if)#encapsulation dot1Q 2
Hostname(config-if)#ip address x.x.y.y < subnet mask >
SOURCE: How do I connect cable modem to cisco 3560 switch and configure it?
The cable modem will need to go through a router because it needs a NAT and PAT translation table, connecting the cable modem direct would lose the ability to get to the internet.
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