Networkers — I ran into configuring one of these routers for a client and I wanted to bring something up in case anyone finds themselves in front of one of these guys.

Now — these models are meant for small businesses, they have only 4 fastethernet ports, and one mgmt ethernet port. It also has an option for a Wireless module as well.

One thing I ran into was putting the public IP directly on a port — but when I did this I got the following message.

% IP addresses may not be configured on L2 links.

Huh? Well how was I suppose to put a static IP on one of the interfaces so I can get out to the internet? Looking a Cisco Quick-Start Guide didn’t really help too much, but I remembered that this is a SMB model, not a enterprise model that I’m used to. Even the routers auto-config wizard that you get when you first startup the router didn’t really help me.

Then I remembered the ASA 5505 models. They are unique than the 5510+s where you need to put the public IP on a SVI, not an interface. So I went again and configured an new SVI called “int vlan2” and put the public under there.  I also put one of the fastethernet ports under “switchport access vlan 2” and connected that port to the provider.

A poof — that was it. I just had to change the NAT statements to reflect the vlan2.  Hope this  helps someone out there working with this model!

William Zambrano

William Zambrano

NYC networkers is run by William Zambrano, a passionate network engineer who has been in the IT industry for eight years who posts up blog articles, YouTube videos, and holds events in the NYC area. He lives in Queens, New York and has consulted in various different companies in the NY area. Previously William worked as a Cisco Certified Systems Instructor (CCSI) but now currently works for Arista Networks serving as a Systems Engineer. William can be reached by email at

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