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I need to configure a modem for my asdl connection. I have 4 public ip to manage:

  • 1 for my modem

  • the others for servers that are on my LAN

The situation is this:

modem with public ip

My problem is: which is the configuration that I need to apply to my modem? I mean, what is the technique that I need to apply?

Thanks a lot!

closed as off-topic by Zac67, Ron Trunk, Ron Maupin Feb 8 '18 at 14:40

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "NE is a site for to ask and provide answers about professionally managed networks in a business environment. Your question falls outside the areas our community decided are on topic. Please visit the help center for more details. If you disagree with this closure, please ask on Network Engineering Meta." – Zac67, Ron Trunk, Ron Maupin
If this question can be reworded to fit the rules in the help center, please edit the question.

  • Unfortunately, questions about home networking and consumer-grade devices are explicitly off-topic here. You could try to ask this question on Super User. – user36472 Feb 8 '18 at 11:15
  • Hello Bau Miao, welcome to Network Engineering S.E. Please keep in mind that SOHO devices like your Fritzbox are off topic here. So we can answer to the question about the techniques to be used, but not about your modem configuration. It could also be debated if it's a good idea to have Internet facing servers behind such a device, without a true firewall. – JFL Feb 8 '18 at 12:07
  • Hi JFL! Ok I'm agree! The real target of my question is about the techniques. I have put the model of the modem only to be exhaustive. – Bau Miao Feb 8 '18 at 13:58
  • Sadly, consumer grade equipment is also off-topic. Super User is the place to ask this question. – Ron Trunk Feb 8 '18 at 14:00
  • I have cut off the modem model. – Bau Miao Feb 8 '18 at 14:25
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This is basic routing, a function that normally routers perform by default, without any special configuration other than setting the IP addresses on the interfaces.

Assuming the ISP take care of routing the 4 public IP addresses to your router, all you have to do is set the IP addresses on the servers and the router, and configure the router with whatever default route your ISP gave you.

SOHO routers have NAT enabled by default, and it is not needed if you set the IP addresses on the servers, so in this case you would have to disable it.

You also need to configure at a minimum some access list to filter the traffic that can reach the servers in addition to have the local firewall of each server properly configured.

  • Perfect. Thanks a lot JFL. My concern was about any advanced features that the router needed to have. – Bau Miao Feb 9 '18 at 10:09

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