Dynamic Switch Routing

[Douglas Turner]

I am using a 3750 with a router provided from Time Warner. I am unable to access the internet from any devices and I believe it is from the IP address changing on the router. How can I configure the switch to maintain the connectivity?

[Richard Bradfield]

The ISP supplied router should do the NAT for you.

can you get to the internet if you plug a device directly into the router?

do your devices pickup an IP address from the router?

and what is the config of the 3750?

[Douglas Turner]

Thank you for your response and assistance.

I am able to access the internet with a direct connection and all devices receive an IP

On each fast Ethernet port I have created vlan 3 with switchport access.

gig1 is currently no switchport because I have been trying to follow other instructions that didn't work.

interface Vlan3
 ip address 192.168.0.30 255.255.255.0
!
ip default-gateway 192.168.0.1
ip classless
ip http server
ip http secure-server
 

[Jason Dance]

Is Gig1 the uplink to your TWC router? If so, you should set to to be an access port just like the fast Ethernet ports. Edit: it should also be a part of vlan 3 as well.

[Douglas Turner]

This is what I had set up before I made changes.

interface FastEthernet1/0/24
 switchport access vlan 3
 switchport mode access
!
interface GigabitEthernet1/0/1
 switchport access vlan 3
 switchport mode access
!
all of the fast Ethernet ports are the same. gig 1/0/2 is not being used so it is not configured.

[Richard Burts]

Which interface of the switch connects to the Time Warner router?

If you connect a PC to one of the switch ports what IP address does it get? And what does it get as the default gateway address?

If you connect a PC to one of the switch ports can the PC ping the switch address of 192.168.0.30?

If you connect a PC to one of the switch ports can the PC ping the default gateway at 192.168.0.1?

HTH

Rick