topic Re: HOWTO: Setting up multiple static IP's on NON BT Hardware. in Archive

HOWTO: Setting up multiple static IP's on NON BT Hardware.

gRoberts — Thu, 13 May 2010 17:26:44 GMT

Hey everyone,

Well... After I'd say 3 months of battling with BT, I finally managed to get them to pull their finger out (Thank you Fiona for her help) and support an issue caused by them.

I've been looking ALL over the internet for help on setting up an ADSL Modem/Router with multiple static IP's and I never found any.

What's even more annoying is, the solution is SO simple.

First of all, You need to make sure you have an ADSL modem that is capable of disabling NAT.

I tried everything and couldn't get anywhere and the nice people at ITSM resolved the problem within minutes.

BT gave me the following information:

Gateway IP: 81.xxx.xx.222

Range: 217-221

Netmask: 255.255.255.248

So first of all, I logged into the ADSL Modem, put in my login credentials and disabled NAT.

After that, you need to change the IP Address of the ADSL modem and it's internal DHCP range (or disable DHCP) to reflect your details above.

Set the IP Address to 81.xxx.xx.222 and set the subnet mask to 255.255.255.248.

Then, if you have DHCP enabled, set the starting IP as 81.xxx.xx.217 and the end 81.xxx.xx.221.

Now all you need to do is either plug in your devices and let the DHCP assign the addresses, or you can set the IP manually on the device.

When setting it manually, make sure you set the Gateway IP and DNS as 81.xxx.xx.222. For the secondary DNS server, I use OpenDNS's servers.

Then, go to http://www.myipaddress.com to confirm it all...

If anyone has any problems, post here and I will "try" to help, or hopefully it will encourage others to help out.

Fingers crossed, BT won't delete this.

Cheers

Gavin

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

Fiona — Fri, 14 May 2010 09:54:05 GMT

Hi GRoberts,

Thanks for posting the solution up. We wont be taking this post down as it will be a big help for other people on the forum.

Thanks again,

Fiona

BT Business Forum Moderator

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

gRoberts — Fri, 14 May 2010 09:56:01 GMT

Thank you Fiona, it wouldn't of happened without your help!

You can understand why I'd think BT would want to delete it though.

If anyone see's any flaws in my post, please do let me know and I will update it accordingly.

Cheers

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

gabi_cavaller — Fri, 28 May 2010 12:00:09 GMT

This should certainly not be deleted.

I have been trying to set this up in one of our offices and failed, 4 attempts in the last 6 months and still no luck.

Spoken to numerous techies and none able to help with this scenario.

As soon as you mention you are using a none BT router, you're asked if you want to speak to the additional support team at a cost. (why should I pay, when I am already paying for extra IP's and also, it's their own line - regardless of the device you use, the settings are all the same.*)

I will be trying this out shortly and seeing if I can get this up and running.

Many thanks, this thread has been ever so helpful,

Regards,

Gabi.

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

gabi_cavaller — Fri, 28 May 2010 12:58:07 GMT

Sadly, didn't work.

I will have more of a play later.

What LAN IP with you give your router?

My config was as follows.

Gatway : 217.xxx.xxx.254

Range: 249-253

Network Mask 255.255.255.248

ROUTER > FIREWALL > PCS's (via a switch)

ROUTER:

WAN 217.xxx.xxx.254

NAT off

DCHP off

LAN IP: 192.168.1.1

FIREWALL:

WAN 217.xxx.xxx.249

LAN 192.168.1.10

................................................

Thanks,

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

spank — Mon, 31 May 2010 09:08:56 GMT

Hi there,

You can't assign a WAN IP, this must be set to obtain automatically. Set the router LAN to one of your static IP's or enable DHCP and set the range as gRoberts suggests.

Bear in mind this will only work for a limited number of PC's, once you run out of static IP's you cannot add any more without additional hardware unless your router is capable of dealing with two subnets like a Vigor 2xxx.

Thanks

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

alastair — Thu, 03 Jun 2010 08:52:56 GMT

Dude (gabi), this has been covered a hundred times in these forums.

First off BT don't support 3rd party routers because they did not supply them and any service provider will do the same. They will support the equipment they supply and have a next level of tech support or people who know what they are doing and this service will be chargeable. BT do it. Virgin do it and i'm sure others will do it too. it would only make sense. Why would you get equipment you clearly don't know how to set up yourself and then expect someone else to help you with it for free?

Anyhoo i digress, one more time for your benefit.

This works on most routers. some routers are slightly different.

First log into the router GUI. (graphical user interface)

leave the WAN (wide area network) ip to obtain automatically. you specify this and it wont work.

go to LAN (local area network) setup and change the LAN range from your default e.g. 192.168.0.1 (i love netgears) to the multi static gateway address. you can have DHCP on if you want for the 5 ips but sensible people turn it off to avoid duplicate assignment of ips.

apply those settings and you will lose access to the GUI. you now specify one of the 5 static ips as the pc ip address and put the routers new gateway address as the default gateway.

this is just to give access to the gui again.

you now find the tick box for NAT (network address translation) and untick it or select disable. save the settings and then reboot the router. when it comes back on you should get internet access on the pc. (remember to specify DNS in the TCP/IP settings or it also wont work) if it does then its all good and your firewall is ready to go on.

Hopefully this is not too complicated and you will manage to set this up.

If not BT have their ITSM desk that can talk you through this but it is chargeable remember.

PS - Spank - no, thats wrong. the network of PCs will go behind the hardware firewall that will have a WAN ip of 1 of the 5 static ips and a normal private network that will host all the pcs.

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

spank — Thu, 03 Jun 2010 10:19:44 GMT

You can't assign a WAN IP to the BT router...you just said that yourself too. And how do you expect the static IP's and the 'normal' network as you say to communicate without additional hardware. There needs to be hardware that is capable of bridging the 2 subnets, a firewall or most routers won't do this.

Multiple statics may be confusing the issue, why do you need multiples?

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

alastair — Thu, 03 Jun 2010 12:14:21 GMT

Perhaps you mis-read

Yes. you cannot assign a static ip to the WAN of the router.

You can assign a static ip (the 5 static ips not the gateway ip) to the WAN of the device behind the router, in this case the hardware firewall. it was this devices WAN i was referring to.

The static ips and normal network are seperate as the network should be

Router > Hardware Firewall >PCs

not

Router > Hardware Firewall + PCs (this is the physical setup you are confusing this with, which yes this is wrong for multi statics and will cause issues in regards to networking and if you have a single ip you can do this but it makes the Hardware Firewall pointless.)

so lets go with an example of how a network should be physically set up for multi-statics.

lets say i have 5 ips

1.2.3.4 - 1.2.3.8

gateway is 1.2.3.9

we have: Router (WAN - Auto LAN IP - 1.2.3.9) > Hardware firewall (WAN IP 1.2.3.4/5/6/7 or 8 LAN 192.168.1.X (or whatever you want as the private range)) > PCs (obtain DHCP from Hardware Firewall)

this is the common setup for multi static ips at a basic level.

Hopefully this clears up confusion

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

a-hill — Thu, 03 Jun 2010 10:44:13 GMT

I'm inclined to agree with alastair, the LAN side of the firewall will be handling the private network while the WAN side sits with one of the static IP's in the range. It would defeat the point of the firewall if the PC's were sitting along side it and not going through it.

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

alastair — Thu, 03 Jun 2010 11:06:49 GMT

Also, Pank n Spank....

We are talking about non BT routers. FYI

even then the network setup is the same. its just the 2700 router is terrible for recognising statically assigned devices

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

spank — Thu, 03 Jun 2010 11:10:47 GMT

Yeah that works fine for 1 of the 5 static IP's, its the rest I'm on about. That setup doesn't allow for use of the other 4 IP's. My comment was to advise on that particular fact and to bear that in mind when setting it up the way you are suggesting.

Also ITSM don't suport hardware firewalls, just the router setup.

There are numerous ways to configure firewalls and all are different. You would need to read the manual to decide on whether you should be using multiple or single statics or even if the firewall is capable of what you want it to do then choose the BT package accordingly.

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

alastair — Thu, 03 Jun 2010 11:57:38 GMT

technically speaking the other 4 ips can be used if you have a router for each one behind the main router, each with a static ip on its WAN and the LAN ip of each router within the hardware firewalls LAN range but addresses not being used by pcs. eg 253 252 251 250 etc...

i should probably draw this...

some hardware firewalls can actually use all 5 static ips and router them accordingly

Right.... drew this VERY crude and quick diagram of a theoretical advanced network setup utilising the 5 ips.

remember that this would be rare if used at all and it is only 1 possible method. you could also use servers instead of routers 2 - 5 as long as they have 2 network cards and you correctly set up routing and remote access.

Inbound traffic will route using port forwarding on the HW firewall and routers 2 - 5 to the correct internal 192 address.

in this network either the HW firewall or most likely a domain controller (server) would run DHCP.

the default gateway ip determines the route the traffic will take out of the connection. sensibly you would set it to the hardware firewall. you could also in a large network set different DGs to load balance network traffic.

i realise this is advanced for the small and medium networks BT customers use. BUT.... it is possible

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

spank — Thu, 03 Jun 2010 14:45:22 GMT

Thats a bit serious tbh... if you purchased a vigor router and used IP aliasing it would do the same job. In fact, the BT router would also do the same job without having to purchase extra routers.

Removing the routers from your diagram should be possible as well since the PC's are capable of being configured for multiple IP's...just add a static one in advanced tcp/ip and it will see the router and be visible via the static. Still, only one static is being routed through the firewall and that might be an issue for some users.

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

alastair — Thu, 03 Jun 2010 14:48:55 GMT

Yes it is serious. i was making a point that it is possible.

You didn't seem to be grasping the concept so i had to give that example.

and yes it is possible to do it with a vigor. and cisco hardware firewalls (amoungst others)

but i wouldn't place much money on the 2700 doing it as although it CAN set this up... the 2700 has that good ole fashioned issue of not recognising statically assigned ips and yes yes i know you can ping the ip and it possibly maybe come up but one day it will probably forget the device or need factory reset yadda yadda yadda. hell, even in this rant i am remembering all the reasons i would never use a 2700 on a non basic network... um where was i?...

yea, thats basically it.

you seem to speak of this BT router alot when we have already dismissed them as not being used at all. im beginning to think you are just one of BTs frontline techies that sticks to what you know. and even then either you aren't being clear (your posts read like the 2700 will use static ips + private LAN addresses too), or haven't grasped the concept..

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

spank — Thu, 03 Jun 2010 15:04:00 GMT

lol...just lol. I'm done.

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

jzedward — Thu, 03 Jun 2010 16:46:18 GMT

slightly off topic, same q on a BT 2700 router.

I have 5 static BT addresses; I want (at least) 3 servers accessible on the internet servicing multiple ports (80 & 443 minimum) ie port mapping is no use to me as that's a one-to-one WAN to local mapping

In your example I want 1.2.3.5:80 and 1.2.3.6:80 both accessible externally; can I do this with a BT hub, or anything else!

Thanks in advance

John

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

alastair — Thu, 03 Jun 2010 17:07:10 GMT

Before a suggestion can be made can you tell me...

will these 3 or more servers need to be accessible locally aswell?

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

jzedward — Thu, 03 Jun 2010 17:10:01 GMT

they are accessible on the home LAN now (1.2.3.4 routes ok to them), but I can't see them externally

If they're on the public internet thye'll be available anyway?

One is Dynamics CRM, one Home Server Vail beta and one WS2008R2 (SBS to come later...)

Re: HOWTO: Setting up multiple static IP's on NON BT Hardware.

jzedward — Fri, 04 Jun 2010 08:49:48 GMT

SORTED - the site *was* visible externally, it's just that I couldn't see it on my OpenZone connected iPad for some reason. The advice in the post means I'll be able to set up my multiple servers ok. Thanks for feedback