router died - temporary solution with layer 3 switch?

[eto-my-Icon]

Hi 

We are going to be without a router for a week, I'm wondering how to route the traffic using my existing 3560G switch until the new router arrives.

model = WS-C3560G-48TS  SW version = 12.2 (35) SE5    SW image = C3650-IPBASE-M

I have an internet connection provided by dhcp.

i setup a new vlan because i want to leave the configuration of the existing setup as intact as possible.

how do I configure a port on the switch so I can patch the internet source and have my new vlan route traffic out.

gi0/10 - internet connection in. (provided by dhcp from external source). 10.103.3.xxx

vlan 14 - new vlan 

ip address 172.16.16.16  255.255.255.0

gi0/20 - pc on vlan 14

gi0/21 - pc on vlan 14

gi0/22 - pc on vlan 14

gi0/23 - pc on vlan 14

if anyone can tell me how to configure the relevant ports or even point me in the right direction that would be much appreciated.

thanks

jim

[Mark Malone · Accepted solution]

Hi

The problem is a switch cant do NAT , you need a router for that to break out  to the internet if your planning on connecting the internet circuit to the switch

ipbase can do basic routing statics , stub eigrp etc but without NAT you cant get to the internet , the switch wont know how to translate private to public addresses

[rikshit4aggarwal]

Perhaps you can configure ports 20,21,22,23 as switchports and then put these ports on the relevant vlan(eg. vlan 14). You can enable "ip routing " on the switch and the put a default route as the next hop of the internet interface ip address( eg. if 10.103.3.1 is the ip assigned to gi0/10 and 10.103.3.2 is the next hop, then "ip route 0.0.0.0 0.0.0.0 10.103.3.2"

Regards,

Rikshit

[devils_advocate · Accepted solution]

As Mark says, the switch cannot do NAT which rules out plugging the internet connection into the switch.

In order to access the internet, you need a router which has an ethernet WAN port for your internet connection and is capable of configuring static routes as you have multiple IP ranges.