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Question for home networking - 5 useable IP's




Posted by abridgel, 05-31-2010, 11:23 AM
Hi there: I am new to hosting in general. I got 5 useable IP's from my ISP. How do I set it up so that each of my computers from home can act as a server of some sort. I am familiar with port forwarding but that's not what I am looking to do here. I want to be able to ssh or ftp, etc into each server with a unique IP address from the outside world. How would I acheive this? I currently have a speedtouch 780 that currently acts as my gateway but I also have a small inexepnsive smart switch from netgear. How could I use thie switch to help me acheive having 5 distint IP's to access from the outside world? Thanks

Posted by fwaggle, 05-31-2010, 01:13 PM
Does the speedtouch grok routing 5 WAN IPs to your LAN? When we had 5 static IPs from AT&T, I had to go back to using our Cayman 3546 instead of our Speedstream 4100 in front of my FreeBSD router. The Cayman simply picked the highest IP and used that as the default NAT IP (ie, all outgoing connections would be initiated from that IP, and all requests to that IP went to whatever was configured as the DMZ or configured via port forwarding). I was then able to configure "IP Maps" (that's a Netopia name, I don't think it's what every manufacturer calls the process) to other machines to make them "servers" as well... your router may have a capability to do this, your mileage may vary. It should be noted that any machine you set up via an "IP map" (or whatever your router calls it) will be effectively DMZed on it's own IP, and won't have the benefit of the NAT device as a firewall - so you don't need port forwarding, etc. I'm sure your ISP can probably help you out, or tell you if you need additional hardware.

Posted by abridgel, 05-31-2010, 01:25 PM
Could I thoertically configure it as follows DSL Modem -> Switch -> Router ->> Home PC1, PC2, PC3 Than plug my 2 Ubuntu boxes directly to the switch and they could theoretically connect with public IP's? Also is there any benefit of setting up the LAN ports on my Router as WAN ports?

Posted by fwaggle, 05-31-2010, 01:51 PM
That depends entirely on your router's capabilities - whether it understands handing out the WAN IPs to LAN devices or not. So you'll have to either contact your host and ask them, or wait and see if anyone else here is familiar with your router (you could also try searching and eventually posting over at broadbandreports as someone there might be knowledgeable with your situation). My Speedstream for example will happily hand out the WAN IP to a LAN device if I so configure it, but it'll only ever do one device - it doesn't understand NAT or anything of that nature and it only supports a single WAN IP. I have to use the Cayman to understand multiple IPs, and it doesn't hand the WAN IP out to the LAN device. Yes, if you have something that doesn't traverse NAT well, having it in the DMZ can help it work. Like I posted earlier though, you lose the protection of the router acting as a firewall - the machines DMZed with static WAN IPs will basically be naked on the internet so you'll want to make sure they have good host-based firewalls.

Posted by abridgel, 05-31-2010, 02:11 PM
In this configuration I wouldn't want my home PC's available via public IP DSL Modem -> Switch -> Router ->> Home PC1, PC2, PC3 So if I plug my Ubuntu boxes into the switch (essentially naked) I would be able to access them via public IP? I understand I would need a rock solid firewall on both Ubuntu boxes but isn't this what Linux is famous for? Plus I am sure I can configure Ubuntu to only listen on particular ports and block all others

Posted by fwaggle, 05-31-2010, 03:30 PM
Again, that's how it should work, but that's entirely dependent on the capabilities of your DSL modem.

Posted by abridgel, 05-31-2010, 03:33 PM
The DSL modem can be setup in bridged mode - which will allow pass through I believe



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