I'm still a student so please forgive me for my ignorance. I'm still learning. So I got a T1 line to practice and learn with and they gave me 5 IPs to play with. For example,126.96.36.199/29 8.8.8.[1-5]. Now I have my line going directly into a Sonicwall Pro 1080 set up with an IP of 188.8.131.52. I want to add a Cisco 881 and give it the IP address of 184.108.40.206. I'd like to do it without plugging into the 1080 and use NAT. So I dropped a switch in front of my 1080 to run the lines in parallel, but once I plugged the 881 in, I lost all Internet access through my 1080. Is this something that can be done? Is there a better way of doing this? BTW, the switch I am using is a Buffalo BSL-PS-G2108M.
On the SonicWall 1080 & the Cisco 881 are you using the same Default-gateway (the IP of the T1)? In your example, 220.127.116.11/29... 18.104.22.168 would be the default gateway of the T1 provider. So your sonicwall should be .2, 881 should be .3 (.2-.6 usable IPs) You are correct that your topology/setup 'SHOULD' Work. Although you can run into oversubscription issues on your T1 doing that, but is fine for learning/practice.