Vlan and internet access

[bearvalley]

Hello all.

I hope someone can point me in the right direction here.I have a 2650 which is configured for a default VLAN1 and a new vlan 10 for guests.The 2650 is acting as the default gateway as it has ip routing enabled with a default route pointing towards my internet modem/router.Both vlans are working as expected except i cannot access the internet from vlan 10. if i replace my internet modem/router with a simple pc i can ping this from both vlans but when i use the modem i cannot. am i missing something here?

many thanks

 

[TheBublitz]

Make sure you have a route BACK to you vlan 10 in your router/internet modem.

Vlan1 192.168.1.0
Vlan 10 192.168.10.0

192.168.10.0 255.255.255.0 192.168.1.(ip of vlan 1 on your switch)

Billy Bublitz
Integrity Windows and Doors

 

[FWHATER]

It could be your cabling ? Are you using a straight through for the router/modem ? Try a crossover. You're definitely using a straight through for the pc into the switch with native vlan 1, but the router might need a crossover.

As long as the lan interface of your router is on the same subnet as the switch, a route back to the switch is unnecessary. The routers job is to send traffic from the inside to the outside. It already knows what's on it's internal network.

 

[testbench]

Are the P.C's on vlan 10 using the vlan 10 interface address as thier default gateway?

Nice