BT2700HGV making Server available to internet

[msaunders]

HI there I have a BT2700HGV router with the following settings

DHCP turned off

Router IP 192.168.1.254

Wireless: WPA2

Broadband IP network: Obtain IP address automatically

DNS: Obtain automatically

I have a block of 5 IP addresses

I have 5 client PCs on the network and 1 Small Business Server 2008 server

The Small Business Server is doing the following:

DHCP

DNS

SharePoint

Active Directory

Exchange 2007

Now all the clients can get out onto the internet but I am having trouble assigning one of my Static IPs to the Server.

When I log into the router and go to Settings > Lan > NAT & Address Allocation I can see the Server entry but when I try to change the Wan IP mapping to one of my public IPs I get the following error

Errors: For the public routed subinterface only wan IP mapping is allowed

When I look further down the list of devices I can see a internal device has a static IP assigned and it accessible from outside the network via port 81

Why cant I assign a static Ip to the Server?

Thanks

[msaunders]

Ok so I have been reading that for a small business server I need 2 NICS.

1 Nic with a Public IP  and the other with a internal 192. address

Is this correct?

[Tracey]

Hi msaunders,

I am sorry to read about the problems that you are having.

However I have had a look into this for you. First of all, if you do not require all 5 static ip Addresses we would suggest to downgrade to the single static IP. It is much easier to set up as you can use port forwarding on the router for anything you need and you will not need a second network card.

If you do require all 5 Static IP's you would need to make sure that your server has two network cards. Example of the setup would be like this..

Network card #1 - LAN

Network card #2 - Internet/router/WAN

#1

IP - 192.168.0.1

Subnet - 255.255.255.0

Default Gateway  - Blank

DNS - 192.168.0.1

Then you would need to set up DNS forwarders to the router address and also some external IP's if you know of some.

#2

Network card should be set to obtain automatically.

Then in the 2wire it will be able to take an IP address from your pool, the reason this isn't working at the moment is that the 2wire uses DHCP address allocation, the dead giveaway there being the DHCP, if the server isn't using DHCP on the network card that is connected to the router this it is going to be extremely difficult to get it all up and working.

Hope this is of help

Tracey

BT Forum Moderator

[msaunders]

Hi Tracey 

Thanks for replying

I have now fitted another NIC

Here is my setuo

NIC 1 (SBS Internal)

IP 192.168.1.1    (Static)

Subnet 255.255.255.0

Gateway 192.168.1.254

NIC 2 (SBS External)

Set to Obtain an IP automatically using DHCP   (DHCP is bing handled on the server not the router)

When I login to the router and go to NAT & Address Allocation it says that NIC 2 is on a static

What am I doing wrong?

[msaunders]

If I assign my second NIC the Static IP that I need will that work?

[Tracey]

Hi msaunders,

The first SBS Internal address must be a different range (192.168.0.1 or 10.0.0.1 for example).

On the SBS External make sure it's set to DHCP and then do a release/renew on it.

Also, it sounds and looks like you have both NIC's connected to the 2wire. The only device connected to the 2wire should be the server via the SBS External network card, all the client computers should be connected via a switch/hub to the server via SBS Internal - Just make sure you run the Routing and Remote Access wizard and that will get the rest of the computers an internet connection. If you need wireless access to the network you would be required to install a wireless access point (You can use a normal router if you turn off DHCP and put it on the same as the internal network, I would also recommend putting an exclusion into the DHCP setting on the server for it).

The server should be essentially acting as a middle man between the router and the client machines. Ensure there are no cables that would bypass the server and remember that any wireless access would need to be done on the LAN side of the server so using the 2wire wouldn't work in this situation. 

Hope this is of help

Tracey

BT Forum Moderator

[msaunders]

Thanks for the reply

The first SBS Internal address must be a different range (192.168.0.1 or 10.0.0.1 for example).

Why does it have to be a differenet range?

OK once the 2 wire can see the external NIC as a DHCP address for example 192.168.0.45 what do change the Address assignment to?

Is this how the network should look?

[alastair]

first off, you should only have one DHCP server on a network (havent read all posts because dont have the time so sorry if i repeat stuff)

if your server and the 2700 do DHCP you are going to potentially have dns resolution issues in the future

in your particular network if you require the 5 static ips then you will definately need 2 NICs

you can specify the ips on both cards one for public and one for local ip

you only need to use a different LAN ip for the 2nd NIC if the network is set up as :

BB router -> Server -> PCs

you seem to have:

BB router ->  switch > server + pcs

msaunders, the picture you posted is when you would need to have a seperate lan address + configure routing and remote access

if you have      BB router ->  switch > server + pcs then you can use the same LAN

[Tracey]

Hi msaunders,

Ok, so your set up is exactly how it should be assuming it is how the picture is.

Except for one problem, the internal NIC needs to be on a different IP range than the External NIC.

The reason for this is to get NAT working with routing and remote access.

If you leave your external NIC set to obtain automatically you should then be able to assign a Static IP via the 2wires webpage. Once you have done this just do a release/renew on the external NIC.

Hope this helps

Tracey

BT Forum Moderator

[msaunders]

Thanks Tracey you have been very helpful

I will report back once I have it all up and running