How can we provide enough IP address to MAN network
Hi nanog, When we build MAN (Metropolitan Area Network), we're basically enable the ip layer communication between millions of end system - taking into account the number of family, business building PCs,etc. Recall the scarcity of IPv4 address, I wonder how this huge ip address demand was met in US ? In my mind, we have the following choices: 1. Build the MAN into a private address network, a class A network 10.x.x.x will be sufficient for most metropolitan. But the cons is: need PAT/NAT to access public Internet, and that leads to the potential performance bottleneck. 2. Just wondering, can we use a distributed DHCP system? In this scenario, we can almost convert the address consuming MAN into a 10 to 1 (or 20 to 1) address pool, which achieve nearly the same address utilization efficiency of dialup address pool. Cons: don't know the scalability of DHCP, any comments? 3. Build the MAN into a IPv6 network, and use address conversion at the interconnection point between v4 and v6. Just an idea, feeling that conversion efficiency between v4-v6 should be better than NAT/PAT, any support comments? thanks ! Yu Ning -------------------------------------- (Mr.) Yu Ning, Chief Eng. Internet Network Product Dep. Data Com. Bureau, China Telecom Beijing, P.R.C. +86-10-62072357/54 --------------------------------------
At 06:54 01/01/01, Yu Ning wrote:
Recall the scarcity of IPv4 address, I wonder how this huge ip address demand was met in US ?
More than 50% of the IPv4 address space is not yet allocated, so they aren't so scarce. APNIC should be able to provide sufficient address space -- but you will need to give them a plan for your network to explain why you need so much address space.
In my mind, we have the following choices: 1. Build the MAN into a private address network, a class A network 10.x.x.x will be sufficient for most metropolitan. But the cons is: need PAT/NAT to access public Internet, and that leads to the potential performance bottleneck.
One could build the MAN using private addresses, but put customers in public global addresses, which would mean no need for NAT/PAT. As I said above, you should be able to get enough address space from APNIC by providing documentation for your planned network.
3. Build the MAN into a IPv6 network, and use address conversion at the interconnection point between v4 and v6. Just an idea, feeling that conversion efficiency between v4-v6 should be better than NAT/PAT, any support comments?
Conversion efficiency will not be any different and you would still need to get enough IPv6 address space. You should probably start by talking with APNIC about getting enough IPv4 address space to meet your planned network. That is the simplest and lowest cost approach. Best wishes, Ran Atkinson rja@extremenetworks.com Senior Scientist Extreme Networks Herndon, VA, USA
In my mind, we have the following choices: 1. Build the MAN into a private address network, a class A network 10.x.x.x will be sufficient for most metropolitan. But the cons is: need PAT/NAT to access public Internet, and that leads to the potential performance bottleneck.
Build the network on sequential /24's in the 192.168.x.x range. Makes routing easier. Using 10.x.x.x addresses leads to people messing up netmasks and broadcasting all over the network. I've done two city wide networks this way and it looks good in theory but sucks in practical applications. Then, as you need 'public' IP's you can route smaller subnets of public addresses throughout this network. This also keeps your public servers limited to ones you know about.. (at least some). DHCP? You have got to be kidding for a MAN. Networking philosophy opinions are like bellybuttons, we all have them, we all like our own, other peoples look funny, and most of them smell bad. =================------------------------------------------------------------ mike@geeklabs.com mercenary geek soon to be looking for a new leige
On Mon, Jan 01, 2001 at 07:54:46PM +0800, Yu Ning wrote:
Recall the scarcity of IPv4 address, I wonder how this huge ip address demand was met in US ? [...] Data Com. Bureau, China Telecom
Scarcity? You are aware of how much IPv4 space is reserved for China and its neighbors, yes? :-) -adam
On Mon, 01 Jan 2001 18:58:13 EST, Adam Rothschild said:
Scarcity? You are aware of how much IPv4 space is reserved for China and its neighbors, yes? :-)
Hint 1: Check a Chinese census. Hint 2: With the positioning of net 127, it's hard to get a clear shot at a unallocated /2 prefix ;) -- Valdis Kletnieks Operating Systems Analyst Virginia Tech
participants (5)
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Adam Rothschild -
Quark Physics -
Ran Atkinson -
Valdis.Kletnieks＠vt.edu -
Yu Ning