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Configure Netgear L3 switch as router

Posted on 2009-12-23
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Hello Experts;

I have a Netgear FSM7352PS L3 switch which I need to configure as a router.  The administration manual indicates that routing must be enabled for the device, then the interfaces (or ports) must be enabled for routing.

- I have enabled routing using the GUI (SYSTEM > ROUTING > IP > CONFIGURATION > ROUTING MODE = ENABLE)

- I have enabled routing on two interfaces/ports.  The port leading to an edge router and the port connected to the client. (SYSTEM > ROUTING > IP > INTERFACE CONFIGURATION > ROUTING MODE = ENABLE)

- I have added a default route which points to the edge router

It might be worth mentioning that the only IP assigned to the switch is to the management interface.

The host is unable to access the internet.   Are there other configurations that need to be made in order to have the netgear switch route? Do I need to assign an IP to each interface/port?


EDIT:  As I think about this I think I need to add a few more details.  The edge router that is the DG for the netgear switch is on the same subnet as the hosts and the switch.  In fact there are two edge routers that the netgear switch will need to forward traffic to.

The netgear has an ip of 192.168.1.3
Edge router #1 (DG of netgear) has an ip of 192.168.1.1
Edge router #2 has an ip of 192.168.1.2

I want all clients on the network to use the netgear as their DG, which will then route traffic to the appropriate edge router.

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Question by:silsuba
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Expert Comment

by:Rick_O_Shay
ID: 26112354
Generally on L3 switches the IP interface is applied to the VLAN and you use a unique network or subnet for each VLAN.
The default gateway for clients attached to any of those VLANs would be the switch's address in that subnet.
The static default route on the switch would be pointing to the external router which would be in a differenet VLAN than the clients.
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Author Comment

by:silsuba
ID: 26114690
Rick;

So if I am understanding correctly, you are saying I would need to assign a IP to the VLAN.  In it's current configuration there is only the default VLAN.  I would then need to create a second VLAN with an IP on a different subnet but the same subnet as the external router?

In my configuration above, the two external routes and the L3 switch could not all be on the 192.168.1.xx subnet?
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LVL 21

Expert Comment

by:Rick_O_Shay
ID: 26115122
If you want to use it as an L3 switch that is how to do. You don't have to unless you want to separate the devices by VLAN.
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Author Comment

by:silsuba
ID: 26115145
Sorry.. it seems I am not catching on exactly.

I do not want to sperate the devices by VLAN.  I simply want the switch to act as a default gateway for devices on the subnet.
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Rick_O_Shay earned 2000 total points
ID: 26115218
In that case you just need to make it the default gateway for the devices. The routers can stay in that subnet as they are now.
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Author Comment

by:silsuba
ID: 26115315
Rick;

Well.. the problem is that it is the DG for the devices.  However there seems to be no routing going on.  
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Author Comment

by:silsuba
ID: 26116130
Ok.. I got this to work.. but purely by accident.   I enabled VLAN routing by assigning an IP address to the virtual port of 0/2/1.   Once all the routes were added everything just started working.

Thanks for your comments!
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