Configuring additional fixed IP's - ADSL24

wonder_lander · 15 Jan 2008 at 12:46

I am with ADSL24 and have a block of 8 IP's

How do I go about assigning one of these IP's so that it routes me through to a server I am hosting at home?

I've got a DG834G router but am not sure if I need to configure something at the ISP or just something on the router?

Anyone provide some assistance?

tolien · 15 Jan 2008 at 12:57

AFAIK the DG834G can't do no-NAT (machine on the inside gets a public IP) or multi-NAT (everything gets an internal IP, and there's a 1:1 mapping between some of the internal and public IPs).

wonder_lander · 15 Jan 2008 at 12:59

Is that the short answer for saying, you can't do it

??

tolien · 15 Jan 2008 at 13:07

Indeed. What you're looking for is multi-NAT, which very few routers do (properly).

wonder_lander · 15 Jan 2008 at 13:08

OK Chap, thanks for the advice.

AndrewP · 15 Jan 2008 at 13:34

My DG814 does no-NAT fine, I'm surprised the newer/latest model can't. Depending on what kind of server you're running could you just forward any relevant ports to it?

mandelbug · 16 Jan 2008 at 06:14

Tolien said:
Indeed. What you're looking for is multi-NAT, which very few routers do (properly).

I used to run a DG834 (non wireless) at work when we had ADSL and I could run no-nat and have multiple rules in it for forwarding different IP's to different servers. Cant remember the exact setup as we dont have it now but it can be done. I used to have the DG834 forwarding our public IP to a PIX, another IP to webmail, and one for FTP.

Have a look on Zen's support forums as that is where I got the info from

mdjmcnally · 16 Jan 2008 at 10:48

I can state that the Speedtouch 516 does this very well.

Zen recommend the 536 which is a later version of the 516. I use my 516 with a static block of 8 no problem.

According to the Zen forums the DG834 will do what you want but you need to configure the firewall on the box to forward the traffic correctly. There apparently is no option to turn off the firewall, like there is on a Speedtouch.

tolien · 16 Jan 2008 at 11:17

mandelbug said:
I used to run a DG834 (non wireless) at work when we had ADSL and I could run no-nat

No-NAT isn't multi-NAT: the OP mentioned giving a public IP to one machine, and leaving the rest as is.

I stand corrected on no-NAT working, though the Netgear forums suggest it's iffy.

mdjmcnally · 16 Jan 2008 at 11:33

The way I have mine is from my block of 8, 1 IP is used for the ADSL Routers Ethernet interface, 1 for the Network ID, 1 for Broadcast leaving 5 usable public IP's that I can assign to individual machines. Every machine on my network at home though has a public IP address.

In my profile I have NAT turned off, I also have DHCP turned off and manually assign addresses.

If you can imagine a block of 8 as 40.40.40.0/255.255.255.248

.0 is the network
.7 is the broadcast
.6 is the router

You manually configure the profile on the box using a custom profile, say that is not to NAT, and also say no DHCP and confgure 40.40.40.6/255.255.255.248 as the IP address for the Ethernet. The WAN port is left dynamic as you don't care what that is.

if you make .5 a mail server then on your firewall on the DG834 you need to allow smtp to and from .5. This is routed through the box not forwarded on. As the IP is statically assigned then this works very well as the router just has to route the traffic to the correct pc.

Effectively it turns my ADSL router into the same sort of scenario as using a leased line and ISP router at a business.

AndrewP · 16 Jan 2008 at 19:30

With my DG814 I've just turned NAT off and set the LAN and WAN addresses to be the same (one of the two in my /30). The Speedtouch 536 is fine with a /29, we have one on a connection at work and couple of devices with external addresses 'behind' it, there's also a Voyager 210 doing the same thing without a problem.