[CentOS] binding additional IP addresses to centos6 on one interface

Mon Nov 14 00:44:29 UTC 2011
Ljubomir Ljubojevic <office at plnet.rs>

Vreme: 11/14/2011 01:28 AM, John R Pierce piše:
> On 11/13/11 4:15 PM, Ljubomir Ljubojevic wrote:
>> gives you 6 (six), not 10 IP's.
> and one of those 6 is typically reserved for the gateway IP, leaving 5
> usable hosts.
Does not have to be. System they are on can be designated gateway.

- Router A = ISP's router and default gateway to system B.
- System B (our server) has /30 subnet used to link router A (one IP) 
and system B (other IP = xxx).
- On Router A route/direct /29 subnet (our 6 IP's) to point to System 
B's main IP (other IP = xxx).
- Place all 6 IP's from subnet /29 as aliases to system B and DNAT/SNAT 
internal IP's to them.

All router A will now is that traffic is coming from that /29 subnet 
(those 6 IP's), and it will not care how they reached them. The response 
traffic will be directed/routed via System B's main IP and system B will 
accept them as it's own IP's and do what ever it is supposed to do.


Ljubomir Ljubojevic
(Love is in the Air)
PL Computers
Serbia, Europe

Google is the Mother, Google is the Father, and traceroute is your
trusty Spiderman...
StarOS, Mikrotik and CentOS/RHEL/Linux consultant