Two static IP and two routers

ElkyElky

Hi everyone

My isp, Eclipse Fibre, has given me two static IP addresses and I'm trying to configure them with my two routers.

I have a switch plugged in to the Openreach modem, and both routers are plugged in to the switch. Router 1 automatically connects and obtains the first static IP and has a local IP of 192.168.1.x.

I've been trying to configure router 2 with the second IP address, entering it manually in to the router along with my isp username and password however it doesn't connect to the internet, it's local IP is 192.168.2.x.

Is there a specific way of setting this up? I don't really have much experience with this so I'm obviously doing something wrong. Not entirely sure how to utilise this second IP address.

Many thanks.

GunJack

you don't, unless you have a second phone line installed. There is only one allocation of an IP address to one phone line....

ElkyElky

GunJack wrote: »

you don't, unless you have a second phone line installed. There is only one allocation of an IP address to one phone line....

But they've given me 2 addresses, surely there'd be a way to utilise it? Seems a bit pointless Eclipse allocating me a second address if it can't be used.

GunJack

it can be used, IF you have a second line

GunJack

pointless to you maybe, but to eclipse it's a way of hanging on to it's allocation of ip adresses, so it could "reclaim" the second one from you to give to a new customer

ElkyElky

GunJack wrote: »

it can be used, IF you have a second line

Well that sucks. I thought it was just a case of entering it in to the second router and bob's your uncle.

GunJack

never mind, you won't be missing out on anything....

debitcardmayhem

Of course the two static ip addresses may well just map to the mac address of your one router, i.e. the two addresses (external) map to their internal switch (your one ip /mac address with them). You will have only one outgoing address but still have two incoming .....(come on GJ keep up :cool:). It is called NAT ...of course someone may prove me wrong

securityguy

GunJack wrote: »

it can be used, IF you have a second line

No, in principle it could be used. I have sixteen IP numbers from my boutique ISP, and I can assure you that I don't have sixteen phone lines.

My set up is the most obvious way to do it, which is that my ISP in fact gives me 17 IP numbers. One is used for the outside of the router, and the other sixteen are available on the inside (well, fifteen, because the all-ones address is the broadcast address). Loosely, I have two inside networks, one which is private and NAT'd to that seventeenth address, one which is public and has the machines using IP numbers from the set of sixteen (it's slightly more complex than that because some of the machines are sat on both network, and it's all done with VLANs rather than physical networks).

With only two IP numbers, you could in principle put one of them on the outside, and then have two networks inside, one using private IP numbers, the other containing just one machine using the other public IP number. You would then use the "DMZ" function of the router to pass everything addressed to the outside IP number to a specific machine on the private network. That way, you could have two distinct systems which are individually addressable from outside.

However, doing this with a commodity router is probably quite painful, and you either want OpenWRT or a cheap "enterprise" router like a Mikrotik. I'm also not sure how useful this would be.

What we really need is proper deployment of IPv6. I have a /48 at home, so I have 1208925819614629174706176 IP numbers. I'm relatively comfortable in assuming that I'm unlikely to have that many computers at home (it's roughly a million billion billion).

GunJack

always happy to be corrected, but more than a little faffy and impractical for domestic use, surely?

securityguy

GunJack wrote: »

always happy to be corrected, but more than a little faffy and impractical for domestic use, surely?

It depends on what you need. Clearly, none of this is remotely useful for the typical home environment. But there's hardly a shortage of people who either currently or historically ran large networks and therefore have home networks that are scale models.