[ale] IP Aliasing (please help!)

[jimpop at yahoo.com (Jim Popovitch)]

On Wed, 2005-05-18 at 17:59 -0400, Ryan Fish wrote:
> Hello all,
> 
>  
> 
> I am in need of temporarily setting up IP Aliasing on a web server to
> allow traffic from IPs on two different subnets of the same class C to
> be answered by this one server.  My problem lies in not knowing how or
> where to add the second Default Gateway and Network ID.  I figure the
> Network ID would just be setup in ifcfg-eth1:N though?

Do you really need a second default gateway?   Once you add the aliased
IP it will create a route for it's subnet that should suffice most
cases.   In order to setup the second (third, etc..) interface you need
to alias the "dummy" module.  One of my /etc/modules.conf (Redhat) has
entries like this: "alias dummyX dummy" where dummyX is the name of the
aliased interface (i.e. alias0, or dummy0).  You then need to add
(again, assuming
Redhat) /etc/sysconfig/network-scripts/ifcfg-eth0-range0 

See this for details:
https://www.redhat.com/archives/fedora-list/2003-December/msg02964.html

-Jim P.


> 
>  
> 
> I am attempting to find this info on Google but have been unsuccessful
> so far.
> 
>  
> 
> Subnet one
> 
> Network ID = xxx.xxx.242.192
> 
> Subnet Mask = 255.255.255.224
> 
> Default Gateway = xxx.xxx.242.193
> 
> Available IPs = xxx.xxx.242.195 ? xxx.xxx.242.222
> 
>  
> 
> Subnet two
> 
> Network ID = xxx.xxx.242.224
> 
> Subnet Mask = 255.255.255.224
> 
> Default Gateway = xxx.xxx.242.195 (not sure how this can be though
> since it is listed as a usable IP above)
> 
> Available IPs = xxx.xxx.242.225 ? xxx.xxx.242.254
> 
>  
> 
> Thank you for your assistance.
> 
> -Ryan
> 
> 
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