Not able to used internet via intravlan

Question

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?***********

Answer 1

There are plenty of packet data services that your phone can use & some provider does not offer or configured automatically in your phone. When you browse the internet without using the modem, you might be connected by WCDMA (packet data) & when you use the modem, it's using another services such as GPRS in which your phone is not configured or your service provider not activated. Go to connection & check all access point if all are in order.
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