Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm managing a big building, with a lot of services/vendors and I have a DMZ'd 4-port cable modem, Model: SMC8014, that has 4 separate networks branching off each of its 4 ports. Each network has its own equipment (Its own router/firewall). It's very difficult for me to mess with those networks.

I need to add yet another network that is directly on the WAN and normally I would just plug it into the extra slot on the modem. However, the modem is full. So I'm wondering... Would it mess anything up if I bought a switch to "add more ports" to my modem? I mean can I directly connect a switch to my modem, then from there attach X networks, all with their own routers?

Otherwise, plan B would be to buy a bigger modem, if they make them.

I'm assuming I'd have to get my ISP to give me another IP address for the extra networks as well.

share|improve this question

closed as not a real question by MDMarra, Ward, mdpc, RolandoMySQLDBA, longneck May 29 '13 at 20:19

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

You left out most of the pertinent information required to answer this question. A diagram, some background information, model numbers for all the equipment and the details of how all the different networks are setup would all be helpful. – kce May 29 '13 at 16:27
up vote 7 down vote accepted

Those four ports on the back of that modem are merely switch ports. You should be just fine adding another "dumb" switch to gain more WAN ports.

share|improve this answer
Yeah I figured it was a stupid question lol. Thanks. – PolishHurricane May 29 '13 at 13:57
Unless they're not. I've seen Lancomm units that put each port on a seperate VLAN so you can have four segregated networks. If this is one of those setups... – Mark Henderson May 29 '13 at 21:50
@MarkHenderson - I have that exact model, so I spoke more strongly than I might have otherwise... – EEAA May 29 '13 at 23:03
Ah, fair enough – Mark Henderson May 30 '13 at 0:04

Not the answer you're looking for? Browse other questions tagged or ask your own question.