Cisco850 router can’t handle the speed

I just got a Comcast upgrade to my home router for new speeds and here is what I found out! My old speed measured was 30 Mbps down, 11 Mbps up.

The guy installed the new Comcast box and then I tried again and same speeds! This was from my PC which went through two hubs, and a cisco850 router before getting to the Comcast box.

I then plugged a laptop right into one of the Comcast ethernet ports and got 120 and 11, which is sweet! Well, the 120 is sweet.

Then I plugged the laptop into the cisco850 and I was back to the 30Mbps again. The cisco is rated for 10/100 so I thought it would go up higher, but no such luck. So now I need to get a new router for my home network and see how that performs!

More later.


Cisco851 Router Working With Comcast

I got a Comcast connection the other day so now my house is dual-homed to the Internet! I have DSL with 5 static IPs (which is why I am keeping it), and now a lickity quick Comcast connection.

I did have problems getting the NATing properly working on the Cisco851 however. The first attempt had the Cisco getting the Comcast IP assigned properly w/ DHCP, and the router could ping out just fine. But, no computers behind it using NAT could get out. After much trial-and-error and dozens of google results, I got the following config that worked. I haven’t fully cleaned it up yet and fleshed out the access lists completely, but the important stuff is there 🙂

Another point to add, is that I had heard things about the MAC address getting tied to the first computer you plug in. When I was troubleshooting, I called Comcast and talked to a tech about this, and it is NOT a worry when you are plugging a router in. They claim they only use the MAC with Comcast equipment. I will say that I had first plugged a laptop in to test the line, and then I switched to the cisco without reseting the box, so my experience seemed to prove the tech’s statement.

Click here for the cisco config