Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

Internet connection through different VLAN

Anyone could please help me in here.

Have  a 2 cisco SG500 (layer 3 mode) configured with 3 VLAN connected to an  adsl modem (Trendnet)  - vlan 1 Data, vlan 2 Voice, vlan 3 Testing.  Routing between vlan is ok i can ping any device in any vlan and have  internet access through vlan 1 but no internet access from other vlan ie  vlan 2 and 3. no ping to adsl if i plugged a device in vlan 2 or 3. My  question is do i need a router or a firewall in order to provide  internet access through all my vlans or is it possible with the SG500  connected to the adsl????have enable ip routing and default route in my  SG500 but still no luck. need internet connection for pcs as well as  voip devices.

Thanks

  • Small Business Routers
1 ACCEPTED SOLUTION

Accepted Solutions
Green

Internet connection through different VLAN

Hi Paul, the switch does not perform NAT function therefore if your modem is only a modem giving public IP addresses then you'd need a router to support the NAT function and support either the vlan or static routes.

If your modem is performing as a router, you would require static route on the modem to point to the SVI of the switch to allow the connecting vlan clients to communicate to the modem in turn which makes the internet work.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
2 REPLIES
Green

Internet connection through different VLAN

Hi Paul, the switch does not perform NAT function therefore if your modem is only a modem giving public IP addresses then you'd need a router to support the NAT function and support either the vlan or static routes.

If your modem is performing as a router, you would require static route on the modem to point to the SVI of the switch to allow the connecting vlan clients to communicate to the modem in turn which makes the internet work.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

Internet connection through different VLAN

Thanks sir your help is greatly appreciated. will look forward and work with your solution.

best regards

289
Views
0
Helpful
2
Replies
This widget could not be displayed.