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Static ip to multiple Routers

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jvwjgames
New Contributor

Static ip to multiple Routers

How do I assign multiple Static ips to multiple routers?
Please and thanks.
Accepted Solution

Re: Static ip to multiple Routers


jvwjgames wrote:
So then if I can't tell me how does Comcast or others do it on there routers add multiple statics to multiple router as you see in traceroutes.

Consider the following example:

 

You have 4 routers. You would like to use 4 corresponding static IPs from Comcast on these routers. What you would do is, on each router's configuration page, set static IPs on the WAN interface, and enter the Comcast-provided values. So if Comcast gives you the static IP range 50.252.60.9-50.252.60-13, you would configure router A with 50.252.60.9 on the WAN, router B with 50.252.60.10 on the WAN, router C with 50.252.60.11 on the WAN, and router D with 50.252.60.12 on the WAN. All of the routers will have the same subnet mask, default gateway, and DNS servers, so here each router will have a subnet mask of 255.255.255.248, default gateway of 50.252.60.14, and DNS servers of 75.75.75.75 and 75.75.76.76.  This way, you can have separate networks behind each router, and each router is using 1 of your 5 static IPs.

 

Below is a very crude image:

 

net.png

EDIT you ask how Comcast & others will sometimes report multiple IPs for the same host, as you see in traceroutes..... I don't think the Comcast business gateways will allow multiple IP addresses on one device.... I believe they enfore a "1-IP-per-device" policy.

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Trusted Forum Contributor

Re: Static ip to multiple Routers

I'm not entirely sure I understand your question, but you should just be able to configure each router's WAN with a different static IP from within your block. So for example, if you have the IP range 50.252.60.9 through 50.252.60.13, you would assign each router a different address from within that range, and you would have each router's subnet mask, default gateway, and DNS server settings all match.

jvwjgames
New Contributor

Re: Static ip to multiple Routers

I did but still no internet connection
Community Manager
Community Manager

Re: Static ip to multiple Routers

Hi jvwjgames.  The steps outlined above by train_wreck are correct.  If you will provide additional details about the end to end network setup, cable gateway>>router/ firewall>>switch>>PC, etc..the Community members may be able to provide further assistance.   If your are using a private Comcast static IP please don not included the complete IP Scope,  LAN DHCP IP scopes are ok to list.

 

Thank You

jvwjgames
New Contributor

Re: Static ip to multiple Routers

Ok so it goes Cable Modem>Router-1>Router-2>Router-3 and then my servers but the routers i want to have a static ip on all of them for diffrent routing and security reasons but just want the initial connection to work before i do anything else. and the cable modem does do dhcp on the lan but that is not the issue cause i can get the static ip to work if i direct connect a server to the modem.

Trusted Forum Contributor

Re: Static ip to multiple Routers

So i REALLY don't recommend that setup; chaining 3 routers together like that is IMHO only asking for problems, and the performance hit you will likely take would be undesirable.

 

If you really DO want to have this setup, you will only be able to use your Comcast-provided static IP on the very first first router connected to the Comcast gateway; for the subsequent routers, you will need to configure each one's WAN with an IP address from within the subnet of the preceding one's LAN, and you would also need to keep each router's IP subnet numbering different to avoid IP conflicts, AND you would need to make sure that none of the routers are using the predefined 10.1.10.x/24 subnet that the Comcast gateway is confiured with by default, AND if you have any port forwarding rules you will need to recreate them on each router, keeping the port-to-IP mappings correct on each hop.......

 

I hope by now you see the drawbacks to using this setup Smiley Happy

jvwjgames
New Contributor

Re: Static ip to multiple Routers

So then if I can't tell me how does Comcast or others do it on there routers add multiple statics to multiple router as you see in traceroutes.
jvwjgames
New Contributor

Re: Static ip to multiple Routers

Also did the very first post you post say I can do it.
Trusted Forum Contributor

Re: Static ip to multiple Routers


jvwjgames wrote:
So then if I can't tell me how does Comcast or others do it on there routers add multiple statics to multiple router as you see in traceroutes.

Consider the following example:

 

You have 4 routers. You would like to use 4 corresponding static IPs from Comcast on these routers. What you would do is, on each router's configuration page, set static IPs on the WAN interface, and enter the Comcast-provided values. So if Comcast gives you the static IP range 50.252.60.9-50.252.60-13, you would configure router A with 50.252.60.9 on the WAN, router B with 50.252.60.10 on the WAN, router C with 50.252.60.11 on the WAN, and router D with 50.252.60.12 on the WAN. All of the routers will have the same subnet mask, default gateway, and DNS servers, so here each router will have a subnet mask of 255.255.255.248, default gateway of 50.252.60.14, and DNS servers of 75.75.75.75 and 75.75.76.76.  This way, you can have separate networks behind each router, and each router is using 1 of your 5 static IPs.

 

Below is a very crude image:

 

net.png

EDIT you ask how Comcast & others will sometimes report multiple IPs for the same host, as you see in traceroutes..... I don't think the Comcast business gateways will allow multiple IP addresses on one device.... I believe they enfore a "1-IP-per-device" policy.

skymeat
Frequent Contributor

Re: Static ip to multiple Routers

I'd say on the first router just use static nat to address the inside routers. Remember each interface on a router needs to be a different network.
JeffreyWest
Occasional Visitor

Re: Static ip to multiple Routers

Train_wreck - you stated:  I don't think the Comcast business gateways will allow multiple IP addresses on one device.... I believe they enfore a "1-IP-per-device" policy.

 

Are you saying that I couldn't install a router that supports mulitple IPs behind the Comcast Business Gateway?

Life's too short for bad wine.
Hege
New Member

Re: Static ip to multiple Routers

Did you eever get an answer to this one?

Official Employee

Re: Static ip to multiple Routers

Hi Hege and welcome to the business forums.

 

What exactly are you looking to do with your statics?

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