OKay.....so I'm confused here....I'm sure it's simple, but I'm baffled. Everything is always simple....only if you know it however....
Please help me! Let me know if I need to provide anymore information which may assist.
Below are my troubleshooting steps and my configuration on a cisco 2611 router connected to a DD-WRT Router attached to my cable modem. The DD-WRT home router has 192.168.1.0/24. All devices can ping each other from the 192.168.1.0/24 and the 192.168.5.0/24 subnets. The 192.168.5.0/24 subnet can't access http when using the browser, RDP also works between the 192.168.1.0/24 and the 192.168.5.0/24 subnets. The configurations are good on the SG200 switch.
Cable Modem --->DD-WRT home router--->Cisco 2600--->SG200---->Laptop
The Linksys isn't supporting your other vlans or natting for them. I can't help you with that, but I can tell you that you can configure nat on the 2600 and nat out all of your subnets on the 2611 to the wan interface of the 2611 that the Linksys knows about.
For testing, try this: (Using vlan 5 for testing)
ip nat out
ip nat inside
access-list 100 permit ip 192.168.5.0 0.0.0.255 any
ip nat inside source list 100 interface e0/0 overload
If this works, you'll want to configure "ip nat inside" on all of your subinterfaces that you want internet access for.
Thanks for all your assistance and knowledge sharing! I implemented what you noted and the laptop behind the SG200 was able to resolve dns and get to the internet with one exception currently...the NAT-ing....
I was not able to connect to the laptop via RDP (or ping it) after issuing "ip nat out" on interface e0/0 (connection to DD_WRT Router), however the command got me out to the internet. There seems to be a conflict due to the NAT-ing. The "ip nat out" command also made it not possible to ping from the 192.168.1.0/24 to the 192.168.5.0/24 subnets, but I was able to ping from the laptop on 192.168.5.0/24 to 192.168.1.0/24.
So far vlan 5 can access the internet, the second part is to get vlan 5 (192.168.5.0/24) to be accessible from 192.168.1.0/24. Vlan 5 can be accessible if I remove the "ip nat out" but the the laptop on Vlan5 would not be able to access the internet....
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