[120464] in North American Network Operators' Group
Re: how it routes and network question
daemon@ATHENA.MIT.EDU (Deric Kwok)
Tue Dec 22 07:32:38 2009
In-Reply-To: <000b01ca8297$b8755410$295ffc30$@net.au>
Date: Tue, 22 Dec 2009 07:31:58 -0500
From: Deric Kwok <deric.kwok2000@gmail.com>
To: Bruce Forster <bruce@tubes.net.au>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi Bruce
Thank you so much to explain me in detail. I would like to know about
this it in case i can get another hosting company
Yes. I think the netmask should be 255.255.255.255
1/ but why they are using this netmask setting? save ip address?
then does the router handle many routes in this setting?
2/ What is this advantage for the hosting company?
3/ If I need more ip in the same server, how it works?
4/ Why you said the hosting company is cheap to use this configuration?
Thank you again.
>
> <SNIP>
> 2/ lf =A0the network card in server has problem and need change another
> one, will my ip address change to another ip address also?
> </SNIP>
> Yeah well thats how dhcp works, via ma caddy, i guess you can always spoo=
f
> your old mac address.
>
> <SNIP>
> 3/ why hosting company is using /32 and dhcp? what is advantage? ls it
> easy for administration?
> </SNIP>
> Im guessing because the users are to stupid to understand what a subnet
> mask/gateway is its just easier to get the mac address and assign it to a
> user then let the user assign a ip.
>
>
> Normally in a co-location setup its not like this, inless its very cheap
> hosting.
>
> My co-location has the following setup, and this is how MOST networks sho=
uld
> be run.
>
> Core router using BGP to transit providers, and other local peers.
> Switched network useing ospf to handle the routes and also VLAN's for the
> customers subnets.
>
> So customer should get a vlan assigned to them (which they have no need t=
o
> know what the number is, they are handed a access mode port.
> Customers also issued a /30 (at least) in most cases a customer will get =
a
> /29 or /28 depending on what they need.
> In this case of a /30 its a total of 3 address's
> 1, GATEWAY (put on the ISP/HOST switch
> 2, IP ADDRESS FOR SERVER TO USE
> 3, BROADCAST ADDRESS.
>
> Heres an eg of a /30:
>
> Address: =A0 192.168.1.1 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.00=
0000 01
> Netmask: =A0 255.255.255.252 =3D 30 11111111.11111111.11111111.111111 00
> Wildcard: =A00.0.0.3 =A0 =A0 =A0 =A0 =A0 =A0 =A000000000.00000000.0000000=
0.000000 11
> =3D>
> Network: =A0 192.168.1.0/30 =A0 =A0 =A0 11000000.10101000.00000001.000000=
00
> HostMin: =A0 192.168.1.1 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.00=
0000 01
> HostMax: =A0 192.168.1.2 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.00=
0000 10
> Broadcast: 192.168.1.3 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.0000=
00 11
> Hosts/Net: 2 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Class C, Private Int=
ernet
>
>
> Heres an eg of a /29:
>
> the % ipcalc 192.168.1.1/29
> Address: =A0 192.168.1.1 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.00=
000 001
> Netmask: =A0 255.255.255.248 =3D 29 11111111.11111111.11111111.11111 000
> Wildcard: =A00.0.0.7 =A0 =A0 =A0 =A0 =A0 =A0 =A000000000.00000000.0000000=
0.00000 111
> =3D>
> Network: =A0 192.168.1.0/29 =A0 =A0 =A0 11000000.10101000.00000001.00000 =
000
> HostMin: =A0 192.168.1.1 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.00=
000 001
> HostMax: =A0 192.168.1.6 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.00=
000 110
> Broadcast: 192.168.1.7 =A0 =A0 =A0 =A0 =A011000000.10101000.00000001.0000=
0 111
> Hosts/Net: 6 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Class C, Private Int=
ernet
>
> Hope this makes sence.
>
> Regards,
>
> Bruce
>
>
>
