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not able to used internet via intravlan

I HAVE ONE LAYER-3 SWITCH.(SGE2000-CISCO SMALL BUSINESS).
I HAVE THREE WEB MANAGED SWITCH.(SRRW224G4-CISCO SMALL BUSINESS)

NOW, ALL WEB MANAGED SWITCHES ARE FIXED IN THREE DIFFERENT DEPARTMENT. & LAYER-3 SWITCH IS FIXED IN CENTRAL SERVER LOCATION.

IN L-3 SWITCH, I HAVE CREATED THREE DIFFERENT VLANS & GIVEN DIFFERENT SUBNET TO EACH VLAN.
NAMELY,
(DEFAULT VALAN ID -100 & SUBNET IP:192.168.100.1/24)
(FIRST VALAN ID -10 & SUBNET IP:192.168.10.1/24)
(SECOND VALAN ID -20 & SUBNET IP:192.168.20.1/24)
(THIRD VALAN ID -30 & SUBNET IP:192.168.30.1/24)

NOW,
EACH DEPARTMENT SWITCH ARE ATTACHED TO L-3 AS PER THE PARTICULAR VLAN SEGMENT.

ON L-3 SWITCH,
TWO SERVERS ARE ATTACHED ON DEFAULT VALAN WITH THE SAME CLASS IP & GATEWAY OF DEFAULT VLAN IP(i.e. 192.168.100.1)
IN THIS CASE ALL THE PC FROM DIFFERENT VLANS ARE ABLE TO PING THE SERVER DUE TO INTRAVLAN COMMUNICATION.

*******
PROBLEM:
I HAVE ALSO ATTACHE ONE LINKSYS BROAD BAND ROUTER(WRT54GL) IN DEFAULT VLAN OF THE L-3 SWITCH, WITH THE IP ADDRESS OF 192.168.100.20/24.
I AM NOT ABLE TO GIVE THE GATEWAY ADDRESS ON THE LAN SEGMENT OF THE ROUTER & HENCE INTRA-VLAN PCS ARE NOT ABLE TO PING THEM & NOT ABLE TO USE THE INTERNET.

********* HOW INTRA-VLAN PCS ARE ABLE TO USE INTERNET?***********

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