why dyn or static?

brian

VIP Member
well i was thinking (i know i do that a lot :D) but is'ent it harder for Internet providers to give dyn ips? i mean dont they have to keep track of it? wouldn't it be easier to give a static?
 
IP addresses are bought and sold, like anything else. So, for ISP's it's a numbers game (especially the smaller / local ISP's), they can buy a certain amount IP's (I'll make this very basic and not get into the details), and use them for a greater amount of people. For example: JoeShmoeISP wants to spend as little money as needed to accommodate the 2000 customers that he has. So knowing that more than half of his customers are not online at the same time, he only buys 1000 IP addresses, and puts them in a dynamic pool... saves him $$$. You'll notice that if you contact your ISP and request a static IP Address... they charge you a monthly fee for it (and it's not that cheap).
 
no it is actually easier to give dynamic IPs. For example, Time Warner my own an IP range of 64.0.0.1 ~ 64.255.255.254 or whatever. Then they set up their network, to assign that IP range to its clients. The IPs have lease times and will renew. Depending on server side configuration you can be assigned the same IP to your Modem's MAC address. So, their DHCP servers are broadcasting all the time, and once your modem is activated it knows that it can assign it an IP. Setting statics would be a lot harder, and they would have to be tracked in some sort of huge database so you never assign the same static twice.

Plus, when you micromanage your network you can set technology by IP. So, your ISP can say IP range 64.128.x.x is only static, and the rest is DHCP. That way anything that is IP driven can be assigned to allow x amount of bandwidth on this range, and y amount of bandwidth on this range. Then you can even set up things like VLAN.
 
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