No internet access SG300

Hello everybody,
I am setting up a small lab (before I roll this out to production) and I as the subject of this discussion indicates, I don't have access to the internet from inside the configured vlans.
Here is my setup
Internet
   I
Broadband Router (TrendNET TW100-S4W) LAN IP: 192.168.77.1/24 - This will eventually be replaced with Sonicwall firewall TZ205
   I
   I           link to router using interface gi10
   I
SG300-10P IP:192.168.77.254/24
   I
VLANs 10, 20
ip default-gateway 192.168.77.1
VLAN Interfaces
VLAN10: 192.168.10.254/24 - PROD
VLAN20: 192.168.20.254/24 - FACULTY
I am able to configure the VLANs and I am able to ping between them.
So for example if I configure a PC on VLAN 10 with IP 192.168.10.4, it can ping a PC on VLAN 20 with an IP of 192.168.20.45
From inside the switch, I can ping both of the above PCs, the router's LAN interface (192.168.77.1) AND the internet both by ip (8.8.8.8) and with dns resolution (www.google.com)
However, from each one of the above PCs on VLANs 10 & 20, I can also ping the switch's IP (192.168.77.254) BUT I CANNOT ping the router's LAN interface (192.168.77.1) nor the internet.
I am using interface gi10 to connect both the SG300 and the router, any ideas as to what am I missing?
I have attached the configuration file.
Also, I have been reading about changing the native vlan from 1 to something else. Is this recommended why/why not and what is the process to do this?

Hi Robert, you need a static route on your gateway device to point back to the switch SVI. Your modem box essentially has no idea where to send the traffic.
-Tom
Please mark answered for helpful posts

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Message Edited by scraig8877 on 07-30-2009 12:41 PM
Solved!
Go to Solution.

Do continuos ping ping 192.168.1.1 -t and check how many replies or RTO you will have. If you have replies even just a bit connect your PC to the modem to get internet connection and download the latest firmware and upgrade utility for your Router.
FIRMWARE
1. Go to www.linksys.com/downloads
2. Enter the Model Number of your Router
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1. Go to www.linksys.com/downloads
2. Enter the Model Numner BEFSR41
3. Choose Get Downloads
4. Select Device Version - Version 4.0
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After downloading those files.
Connect your PC back to the Router then run the TFTP(Utlity) set Server = 192.168.1.1; Password = admin; then choose the firmware file that you have downloaded. Then Upgrade the firmware of your router.
Note : Make sure the you have set the TCP/IP and DNS Server of you computer back to OBTAIN IP ADDRESS.
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