Newbie: where do IP addresses come from...

goasakawagoasakawa Member Posts: 58 ■■□□□□□□□□
Ok, just passed the A+ a while back, on the way to my N+. While reading the book (passport for N+) it says on a class c you wouldnt be able to add 500 nodes. The reason stated is it only will distribute up to 255 respectively.

1-My question is if i wanted to hook my companys 500 pcs to a network what class should i use. DOes Class A & B only go up to 255?

2-And if they DO in fact go up to 255, THENif i had (2+) routers to slit up the IP routers 'bridge' networks from diff shemes? (Ex. Router A & B has ..totallying around 400+ nodes. If I want to share files from Router A to B, will i have access?
(I ask because at work a guy set his network up as The internet router is He cant access shares on anyone above 192.168
.0.1. Whats going on?


  • remyforbes777remyforbes777 Member Posts: 499
    How are you getting 400+ nodes with a network address. you can only have 255 nodes on a class c ip scheme which means you can only use
    If your friend is using that is a class B scheme, I am assuming he is using a subnet mask. Is his router using the same subnet mask. How is he getting the address of on his workstation? If he is using the router to hand out DHCP and his router is I am assuming that he is using the subnet of because thats what most home routers default to. So basically if his internal router interface is not configured with the network ID as the default gateway to the other network then you are not going to be able to see the other nodes.
  • goasakawagoasakawa Member Posts: 58 ■■□□□□□□□□
    hi. well, now that i think about it,the real question was:

    1-I need 400 nodes. i have 3 routers [assuming thats what i should be using ]. how do i getall those 400 nodes to act as one network?

    2-yes, hes on a linksys router [w.ith DHCP]. the offices router is x.x.1.1. his router is x.x.0.1. hes can use the lan printer but not any workgroups above x.x.0.1.
  • remyforbes777remyforbes777 Member Posts: 499
    I think the best way to do this is set the IP scheme for each router as such
    for the router , use a network ID of with a subnet of
    for the other router use with a network ID of and a subnet of
    You can use and
    The router will then route traffice in between both networks once you connect the routers up. Hopefully there is a routing protocol enabled on the routers that will allow them to configure the routing tables automatically.
    If anyone else has a suggestion of think that this is totally wrong please let me know. I dont mind critiquing or being corrected.
  • goasakawagoasakawa Member Posts: 58 ■■□□□□□□□□
    Ok so in theory I can make the 400 or any number abouve 254 [computers] act as one network with a couple of routers and a lil' subnetting know how?
  • remyforbes777remyforbes777 Member Posts: 499
    Yes that is true, you can also use a class B ip address scheme, only thing is , you will have more IP addresses than you need and that can pose security risk. but you could also do some subnetting to use less IP's. I'm not an expert on subnetting but I will read more about it and give you some tips if needed. Like for instance you can have a subnet of and that only yields you so many IP's that can be used, thus limiting security risk, because if you use a class b ip scheme and you dont use all of the IP's someone could hop on your network and you would not know.
  • DrakonblaydeDrakonblayde Member Posts: 542
    Well, ok, you could theoretically supernet two class C's together on the router... if you define as the network address with a mask of, that'd give you 500+ nodes on the same network ( to

    The problem is, you can't do that on a Linksys router. They'll allow you to subnet down a Class C, but not supernet, so if you're using a Linksys router, you are limited to handling 254 nodes on a linksys router. The only way around it is to either use a different router, or use 2 routers to route for each subnet. Linksys routers do support RIP, so it shouldn't be too hard to get two different networks to talk to each other.
    = Marcus Drakonblayde
    ==[X]===[X]====[ ]=====[ ]====[ ]==
  • remyforbes777remyforbes777 Member Posts: 499
    Thanks for the clarification Dragon. I knew that it could be done but just wasnt technically for sure how. I have read about supernetting but didnt really dive into it.
  • goasakawagoasakawa Member Posts: 58 ■■□□□□□□□□
    WOW, Even though the N+ (so I hear) wont be sweating Subnetting a lot, I think at least Im getting a taste of the real world and a lil of the CCNA (which I would love to get into). Thank you guys for all the help in clarifying things.

    I tried last night to play with subnetting but pulled my hair out. Its to early in my certifacation game to get to far ahead of myself anyways.....

    But if you guys/gals have some awsome quick links to subnetting, RIP (whatever that it?) and so forth.......would you mind posting? Thanks a bunches! icon_eek.gif
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