Multiple Static IP addresses

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krisby

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#28093 18-Nov-2008 15:41

We currently have a static IP assigned to our server as its our exchange server. However I have just built a new machine that will be an IMS, in order for our clients to get access that also needs a static IP, but Xnet say they can not supply more than 1 Static IP per DSL connection.

Our other option is to get another DSL connection on our fax line, but of course that involves more cost than we would like. I don't quite understand the reasoning behind only allowing 1 static IP, considering we have a Juniper router that is pretty complex and can handle up to 6 (I think) static IPs. Obviously there must be other businesses out there (like web hosts) that would have more than 1 static IP, how do they get additional ones? If anyone knows of an ISP that allows more than one static IP per connection please share.

Something else we have looked at is Dynamic DNS, unfortunately I'm not convinced at this stage on its abilities, so if anyone has experience with it that would be great if you could share your opinion.

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#178598 18-Nov-2008 15:53

Not sure if this applies to DSL but I have a range of 5 static IP addresses on my CityLink connection. One is the primary one we use, the other few are for ancillary systems, or i use them so that I can get into multiple PCs remotely if they're using the same port.

Maybe it's cheaper to upgrade from a DSL to a cable/fibre connection - maybe it's cheaper just to get an additional dsl line put in?

cyril7

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#178600 18-Nov-2008 16:12

As far as I am aware Telecoms DSLAMs are configured to only support one PVC and hence one PPP session, hence only one WAN IP, in theory a DSL connection can support multiple PVCs if so configured, but thats not the architecture Telecom have chosen, so I dont think there is any way to overcome this issue other than moving to a fibre connection. TCLs HFC netowrk only supports one IP per modem, although I understand thats also only a limitation of there configuration they can do multiple if the network allows.

Cyril

SiliconAudio

97 posts

Master Geek

#178945 19-Nov-2008 22:55

Usually you don't need multiple static addresses unless you have multiple servers that all need to listen on the same port numbers. Is your current Exchange server behind a NAT? Usually with ADSL it would be. So, why not just forward the appropriate ports to the servers as required.

Do you also run ISA server? If so, you have lots more options for publishing internal servers out to the net.

If you really do need multiple static addresses, you will need to move away from ADSL.

krisby

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#178948 19-Nov-2008 23:06

Thanks for the replies, we got it sorted this morning, it was the ports on our router, it wouldn't let us configure them previously but this morning it was allowing it, so we changed some code and the port address and voila, a-ok.

chriswiggins

413 posts

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#180558 26-Nov-2008 22:54

Just bringing this back up, doesnt the isp supply ip addresses that you have to route? therefore the modem only has to have 1 ppp session and 1 ip. You then route the ip's you have

krisby

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#180614 27-Nov-2008 09:35

Can only get 1 IP address though, so only 1 to route, but as our router can handle multiple IPs we were trying to get a 2nd. However having tried many times finally the router allowed us to configure the ports, so in the end we didn't need the 2nd static IP, which was just as well as our only other solution appeared to be dynamic DNS, which I was not convinced on.

MrPrimo

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#180618 27-Nov-2008 09:55

you will find its not a limiation of telecom or the network they designed but the ISP you are with, I use Inspire and have a standard Bitstream DSL line with them, over this they route me a /29 so thats 8 IP's + the static ip of the DSL connection, so it can be done as it is being done as I use it :)

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krisby

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#180632 27-Nov-2008 11:00

This is what Xnet told me:

"Multiple IP's was not something that was permitted on the Telecom DSL network so this is not a common service that is offered and I don't know of anyone who currently offers this."

It doesn't matter now anyway as we have sorted it with port routing, but I'm not sure Inspires solution would have been the solution anyway, as we needed a 2nd static IP, not 8 rotating ones, that wouldn't have necessarily helped with our routing/dns issues.

MrPrimo

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#180634 27-Nov-2008 11:04

its not rotating at all, its 9 useable IP's for 9 servers if you wish, which would be overkill on adsl anyway.

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mushion22

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#180666 27-Nov-2008 13:20

You need to understand a bit more about how DSL PVCs and IP Routing works in order to understand what Cyril7 and fishyman are saying.

In some countries it is possible to offer multiple "virtual circuits" over a single DSL line, which in effect creates multiple connections each with their own IP address that all get combined over the same physical line and then seperated by software running on the routers at either end. An alternative, as I assume Inspire have configured, is to use an ISP that can allocate you a block of addresses and set up their routers to know that all of those IPs belong to you. Most ISPs wont do that because of the hassle involved to do it on a large scale, especially not on a consumer/SME grade connection.

Enterprise fibre connections typically have that ability by default because most businesses who need a fast fibre connection will typically have multiple servers running (and the routing software typically used on those connections - BGP - is designed for it).

Not sure whether Inspire would be running BGP over DSL or just using static routes or maybe even RIP. Basically you get given the 9 addresses (or a bigger/smaller block if requested) and you set one of them up on your router, then its up to you as to whether you allocate the rest statically or dynamically to your other servers (obviously you would normally allocate them statically for web servers).

I think maybe you interpreted that as the range of addresses that your router can be allocated by the ISP is narrowed down to 9 different addresses? That wouldn't be very useful at all!

krisby

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Geek

#180687 27-Nov-2008 14:41

No I understood after his 2nd post, I mis read and so mis understood. However I was not aware of this feature anyway, as Xnet did not mention it as an option for DSL, but I was given the option for Fibre and UNS, which are both cost ineffective for us.

The person at Xnet knew what I was wanting to achieve so there was no misunderstanding there, it would seem they only offer 1 static ip per DSL connection, there was no mention of the option that Inspire offer, and she also claimed to have no knowledge of anyone else offering a solution either. Hence why we were looking into Dynamic DNS services, but didn't need that in the end either.

cr250bromo

222 posts

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#180688 27-Nov-2008 14:42

I remember years back when Telecom didn't allow static IPs on Jetstart, one ISP got around that restriction by allowing the user to setup a PPTP tunnel (using their dynamic IP) and then recieving a static IP via the tunnel which was the one they used for general internet access. This could be expanded to multiple static IPs over the tunnel, though don't know of anyone doing this.

/ben

Ragnor

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#180752 27-Nov-2008 20:01

Why does your new server need an ip address specifically, is there some reason you can't use a domain name eg: mail1.yourdomain.co.nz and mail2.yourdomain.co.nz etc?

krisby

19 posts

Geek

#180755 27-Nov-2008 20:15

because we have two servers on the same DSL connection, one deals with exchange and is our main file server, the new one is a new GIS IMS, so in order for the router to know where to send traffic we needed a 2nd IP, but as said already, we solved that by using port addressing on the DNS, its just that initially we thought the router would not allow us to, we thought we needed a firmware upgrade, but we have never verified ownership with juniper and you need to in order to update, and we can't find the receipt as it was given to us as part of our webhosting package.

But thats by the by, its all working now, so no more dramas.

chriswiggins

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#180758 27-Nov-2008 20:16

Does anyone know of a provider that will supply a subnet over PPTP? I need about 3 static addresses.

Cheers
Chris

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