Add IP Address Block

[sohtnax]

I recently requested additional IP's from my ISP. In response they contacted me with the following ip info xxx.xx.xxx.xx/26 How do I add this new block of IP's to my network? What needs to be done on the router?

 

[StarTAC]

hmmm.. u mean u want to 'acquire' them in some way.. once they give them to u, it's just on paper..

all u have to do is subnet it onto your interfaces, and assign clients/users who r attached on those interfaces... e.g. ethernet, serial, ATM e.t.c

then u can say, that block is on your network.. u can't announce it to the internet (bgp), as it's too small..

good luck..

 

[sohtnax]

What are the commands for sub-netting them onto my interface??

 

[phineasgage69]

Commands are the last thing you need, not the first.
What StarTac is telling you is that you first need to decide how and where you're going to use these new IP addresses. Plan this on paper before you even think about implementing them on the router. A few things you need to think about are:
How many segments are you going to run? How many hosts on each segment? Are you running routing protocols? How can you best summarize your routes? etc, etc, etc.
IF you're simply going to use this /26 as a flat allocation (no subnets), then you only need to pick one of the new addresses as your router address and assign this address to the correct interface. For example, your ISP assigns you 192.168.1.0/26. You pick 192.168.1.1 as your router ethernet interface and assign it with the "ip address 192.168.1.1 255.255.255.192" command.

 

[sohtnax]

I am simply adding these. For what I am using them for, I do not need routing protocols, subnets, etc. I am adding these additional IP's to a router which already has IP's from this ISP. My problem is that they are not sequential. I hope this clarifies my question.

 

[jimmyzz]

sohtnax,
I think you need to first digest what it means to be assigned an IP address range from an ISP. When the ISP grants you a new public IP range, they are effectively "routing" this range to your internet router. It does not mean you have to load all the IPs into your router like its some sort of CD-staker.

Decide what you want to do with IP address. You may want to assign public IPs to your web or application servers. If so, then on your router, simply create the access-list/route statement to allow traffic access the host with the new public IP. You may not use all IPs asssigned to you, so just add access-list/route statements for the public IPs you use.

The ISP still offically own the IP range, they simply administer where to route IP range. When you change ISP, they will revoke the IPs from you, assign it to a new customer and start routing traffic for that IP range to the new customer's internet router.

JimmyZ