The first thing to understand is if you are prepaired to adequately route with your own IPs.
There is a clear advantage to ahving your own IPs, from the perspective that you will no longer be held hostage by your upstream, having the freedom to be portable between transit providers. However, most people do not consider or understand all the real issue, relating to their own IPs. Just because you have the freedom to be portable, does not mean that it is techncially possible to route well with your current Network design and upstreams. Its easy to route properly when you have Large blocks (/18 and larger) or when you have all your Transit providers located at one location. The primary problem you will run into is Large ISPs that have OLD routers, that are very limited to the amount of RAM that they have. A perfect example are Cisco 3550s, very common layer2/3 GB switches. What you find is that the routers are not capable to handle all the routes for local connections, and often will limit the minimum size block that they'll accept advertized to them. So if you have a /24 in one city's transit connection, and a /24 on another city's transit conenction, you might be able to advertise the /24s appropriately, but it doesn't mean that they'll accept or keep the routes in their tables. The bottom line is that your network.IP design needs to have it built in what will happen to the path of data, if the routes are not able to adequately be routed to the right upstreams, or for that matter any Peer of that Upstream. The advantage of using IPs from an Upstream, is they make sure their own IPs route optimally over their own network. And you dont have to be hassled by it, if you use theirs. The truth is, they WILL do it better. Also understand that when you use a block (ex /20) you then have the right to ask for a larger one (/19), effectively doubling your space. When you get large allocations, you have a LOT more free IPs to reserve for a specific region, so you can maintain a clear routing design, based on large blocks that all ISP wil l except. With small allocations... Its not really posible to Reserve IP for a region, because it will be to hard to use up all your IPs to justify the next allocation, and to easy to run out of IPs in an area. So you end up assigning IPs all over the place, and when you grow, will probably end up having to compeltely renumber to be able to have routing ppolicies that make sense that match the capacities of your internal network. I'm probably not explaining that clearly. In summary I'm saying small blocks are harder to route. Large BLocks allow you to allocate large blocks in more places. In using your own IPs, whether it be IP4 or IP6, to make it worth it, to have to deal with the headaches of small block allocation, you have to have a clear justifiable reason why you don't want to use your upstream's IPs. For example, will you likely want to change Upstreams? In our case... We defined a clear reason (application/design), why we wanted our Own IPs, but more importantly why we needed control our routing of those IPs. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "John McDowell" <[EMAIL PROTECTED]> To: "Motorola Canopy User Group" <[EMAIL PROTECTED]>; "WISPA General List" <[email protected]> Sent: Friday, September 05, 2008 12:51 PM Subject: [WISPA] Considering ARIN and buying our own IPs....IPv4? IPv6 > Hey guys and gals, > We are looking at our first redundant fiber connection from a second > carrier > and feeling the need to have our own IPs so that this will work out well. > > Anybody have advice on where to start with ARIN, besides just fishing > around > on the website, and what should we be looking at buying. We have a little > over 350 subs right now and growing about 30 subs/month on average. We > have > a block of 2000 IPs from AT&T. > > We want to plan for future growth, and for IPv6....any advice? > > Thanks, > > -- > John M. McDowell > Boonlink Communications > 307 Grand Ave NW > Fort Payne, AL 35967 > 256.844.9932 > [EMAIL PROTECTED] > www.boonlink.com > > > > > > > This message contains information which may be confidential and > privileged. > Unless you are the addressee (or authorized to receive for the addressee), > you may not use, copy, re-transmit, or disclose to anyone the message or > any > information contained in the message. If you have received the message in > error, please advise the sender by reply e-mail [EMAIL PROTECTED], and > delete the message. E-mail communication is highly susceptible to > spoofing, > spamming, and other tampering, some of which may be harmful to your > computer. 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