[LARTC] routable subnet as aliased IP's?

[LARTC] routable subnet as aliased IP's?

[3ds]

Greetings all!
I just got a colocated server space and the ISP has given me an IP address and a
routable /29 subnet.  Here's a partial snippet of the info they gave me (with
the real addressess changed for privacy)

== WAN Address
  Customer IP Address     : 100.0.33.14 
  Netmask                 : 255.255.255.248 
  Broadcast Address       : 100.0.33.15 
  Default Gateway         : 100.0.33.9 
== Routed Network
  IP Address Type         : 100.0.43.152/29 Class-C Subnet 
  Number of IP Addrs      : 6 
  Domain Name             : example.net 
  Customer IP Addresses   : 100.0.43.{153 thru 158} 
  Netmask                 : 255.255.255.248 
  Broadcast Address       : 100.0.43.159 

And they provided this chart:
                                                - 
                                                | 
                                                |      +----------+ 
                                                |      | Customer | 
                                                |------| Host #1  | 
                                                | .154 |          | 
                                                |      +----------+ 
            - WAN -                 - Subnet -  | 
+------+   Net/Mask   +----------+   Net/Mask   |      +----------+ 
|  ISP |  100.0.33.8  | Customer | 100.0.43.152 |      | Customer | 
|Router|---- /29 -----|Colocation|---- /248 ----|------| Host #2  | 
|      | .9       .14 |  Router  | .153         | .155 |          | 
+------+              +----------+              |      +----------+ 
                     ** REQUIRED **             | 
                     **  DEVICE  **             |      +----------+ 
                                                |      | Customer | 
                                                |------| Host #n  | 
                                                | .156 |          | 
                                                |      +----------+ 
                                                | 
                                                - 

I have a single server with Fedora Core3 (x86-64 2.6.10-1 kernel) installed, and
my intent is to use the iproute2 tools to set up aliases for .154, .155, .156,
etc. and then use IP Virtual Hosts in Apache.

So, to my question. I could get a router for routing the /29 subnet as the ISP
suggests, but can I use my Linux machine to do this?  Can I mount eth0 as
100.0.33.14 and then setup the 100.0.43.152-158 as aliases and write the routing
so that everything works?  I have read chapters 3 and 4 of the LARTC, and I
think it may be possible, but it's just not clicking yet as to how I might be
able to do this.

And to add one last twist to this...  let's say that I can do the above, what if
I wanted to take one of those IP's from the /29 subnet and route it on to
another system plugged into my eth1 while maintaining all of the other IP's as
aliases?

Am I dreaming?  Can you help me?

Thanks!
  Ray

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Re: [LARTC] routable subnet as aliased IP's?

[George Alexandru Dragoi]

I think you can just make aliases for all 8 ips (Yes i said 8)


ifconfig eth0:0 100.0.43.152 netmask 255.255.255.255 up
ifconfig eth0:1 100.0.43.153 netmask 255.255.255.255 up
ifconfig eth0:2 100.0.43.154 netmask 255.255.255.255 up
...
ifconfig eth0:7 100.0.43.159 netmask 255.255.255.255 up


On Fri,  4 Feb 2005 01:20:03 -0800, 3ds@norwesters.net
<3ds@norwesters.net> wrote:
> Greetings all!
> I just got a colocated server space and the ISP has given me an IP address and a
> routable /29 subnet.  Here's a partial snippet of the info they gave me (with
> the real addressess changed for privacy)
> 
> == WAN Address
>   Customer IP Address     : 100.0.33.14
>   Netmask                 : 255.255.255.248
>   Broadcast Address       : 100.0.33.15
>   Default Gateway         : 100.0.33.9
> == Routed Network
>   IP Address Type         : 100.0.43.152/29 Class-C Subnet
>   Number of IP Addrs      : 6
>   Domain Name             : example.net
>   Customer IP Addresses   : 100.0.43.{153 thru 158}
>   Netmask                 : 255.255.255.248
>   Broadcast Address       : 100.0.43.159
> 
> And they provided this chart:
>                                                 -
>                                                 |
>                                                 |      +----------+
>                                                 |      | Customer |
>                                                 |------| Host #1  |
>                                                 | .154 |          |
>                                                 |      +----------+
>             - WAN -                 - Subnet -  |
> +------+   Net/Mask   +----------+   Net/Mask   |      +----------+
> |  ISP |  100.0.33.8  | Customer | 100.0.43.152 |      | Customer |
> |Router|---- /29 -----|Colocation|---- /248 ----|------| Host #2  |
> |      | .9       .14 |  Router  | .153         | .155 |          |
> +------+              +----------+              |      +----------+
>                      ** REQUIRED **             |
>                      **  DEVICE  **             |      +----------+
>                                                 |      | Customer |
>                                                 |------| Host #n  |
>                                                 | .156 |          |
>                                                 |      +----------+
>                                                 |
>                                                 -
> 
> I have a single server with Fedora Core3 (x86-64 2.6.10-1 kernel) installed, and
> my intent is to use the iproute2 tools to set up aliases for .154, .155, .156,
> etc. and then use IP Virtual Hosts in Apache.
> 
> So, to my question. I could get a router for routing the /29 subnet as the ISP
> suggests, but can I use my Linux machine to do this?  Can I mount eth0 as
> 100.0.33.14 and then setup the 100.0.43.152-158 as aliases and write the routing
> so that everything works?  I have read chapters 3 and 4 of the LARTC, and I
> think it may be possible, but it's just not clicking yet as to how I might be
> able to do this.
> 
> And to add one last twist to this...  let's say that I can do the above, what if
> I wanted to take one of those IP's from the /29 subnet and route it on to
> another system plugged into my eth1 while maintaining all of the other IP's as
> aliases?
> 
> Am I dreaming?  Can you help me?
> 
> Thanks!
>   Ray
> 
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> 


-- 
Bla bla
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