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New Member

InterVLAN routing

Hi all,

I got a little problem when configuring a switch Cisco Catalyst 3750. Maybe, it is a kind of easy for you guys, but I couldn't do it. So, I'm asking from you.

Here is my problem. There are two vlans on the switch. Vlan 1 is connected to internet, and Vlan 2 port is involved to LAN A. My question: how can any client of LAN A access to Internet through the switch by using Vlan 1 connection? If you have any docs about that, share me URLs pls.

Thank you,


New Member

Re: InterVLAN routing

VLAN 2 Users should have as their gateway the ip of the vlan 2 interface on the switch. On the switch you will have to add a static default route to the internet through the ip that connects to the internet on vlan 1.

New Member

Re: InterVLAN routing

Thanks your comment,

I did exactly what u said.

VLAN 1 has IP address such as, and gateway is

VLAN 2 has IP address such as which is the gateway of LAN A.

interface vlan 1

     ip address

interface vlan 2

     ip address

ip route

ip default-gateway

that is configured on the switch.

So, is there anything should I do?


New Member

Re: InterVLAN routing

With these settings it should work. Do a show ip route and see what it gets. Is ip routing enabled in your switch (it should be).

ip default gateway is only for the switch management traffic you do not need that sent to the internet.

New Member

Re: InterVLAN routing

What is configured on your router where the WAN interface is? Are you Natting Vlan 2 for your user's to get out? The interface from the 3750 to your router, is it trunked, routed or have a sub-interfaces? On the router does it have both subnets in the routing table? Are you using static routes on the router or dynamic? Is there a path for LAN A?

A drawing might be helpful and a basic config of the router could help.