5xStatic IPs & Own Router :: Default Gateway/Router Address ???

[dougster2k]

Hi,

I'm new to business infinity & have been issued with 5x static IPs (plus a 'network address' and a 'router/hub address')... I have a couple of questions for the good folks on the forum:

1) The 5x addresses I've been assigned are in the range 217.37.165.0, but I've not been told what the default gateway address is - should I try high (.254), or low (.1), or is it something else? I found some other threads covering single static IP addresses but they don't describe my situation.

2) Since I'm using my own router, not the BT hub, can I use the provided 'router/hub address' as the primary on the WAN port, thus leaving all 5 static addresses as secondary's for my own purposes?

I tried calling the support line but whilst the lady I spoke to tried very hard she simply couldn't understand the question or context so I'm hoping to find the answers here...

Thanks,

Doug

[dougster2k]

... further to my above post: I've read some additional forum posts that infer a static IP cannot be assigned as the primary address to the WAN port on a router; this however has been impicit not explicit in context, so I cannot tell wether its a constaint specific to BTs own equipment, or a more fundamental network operation constraint that would apply to all routers irreseptive of brand... perhaps someone could elaborate?

Doug.

[Burkem5]

Hi there 

What i would d is speak to the BT Infinity help desk (0800 169 3809)

get the full range the default gateway and the subnet mesk 

then go to the hub via 192.168.1.254
then settings > advanced > continue to advanced > static ip
enter the subnet mask and the default gateway this will give you your pool of ips 

It is true that BT do not allow you to assign one of these ips to the router its self

this is actually set up on the network so no equipment on bts network can get around this -  this is a security precaustion 

the 5 ips will be pingable once they have been assigned to a device though 

[adrianc]

Hi Doug,

The way that BT's multiple IP addresses work means that the 'router address' is one higher than the last IP in your range. So if you have 81.1.1.1 to 81.1.1.4 as your public addresses then the router address would be 81.1.1.5. However, this isn't assigned as a usable address for your router as the public IP addresses are set up as a secondary network on your router.

Your router's WAN-side IP address will continue to be assigned from a dynamic range and will change every time you reboot the router. The 5 public IP addresses are all already usable for your devices.

Hope this helps,

Adrian

Edited for grammar.

[jaketehcatuk]

I use a Juniper SSG firewall instead of the BT Hub.  The setup for my Juniper will be the same in principle for any firewall/router: -

1. Create a connection using PPPOE and set it to get it's IP address via DHCP.  When you do this, your firewall will receive via DHCP the default gateway that it needs to use for routing.

2. Depending on the router/firewall, you can now allocate your static IP addresses as additional addresses for your primary connection (how you do this differs from device to device).  Because you aren't using the BT Hub, you can use all six addresses that have been allocated to you.

You can now use your allocated static IP addresses for what ever you choose.