[CentOS] Re: alias ip-addresses at loopback

Dmitry Cherkasov doctorchd at gmail.com
Mon Sep 15 16:14:12 UTC 2008


2008/9/15 Robert Nichols <rnicholsNOSPAM at comcast.net>:
> Dmitry Cherkasov wrote:
>>
>> Hello everybody!
>>
>> Could anybody advice on the following problem.
>> I need to assign several ip-addresses to 'lo' interface (beside
>> 127.0.0.1). It is convenient to me to implement NAT with such
>> addresses.
>
> The "lo" interface already accepts packets with any 127.x.y.z
> address.  Do you really need more addresses than the 127.0.0.0/8
> block?

Yes.
I need addresses to use for NAT masquerading. If there is more than
one outbound interface for traffic it is inconvenient to use addresses
bound to a particular physical interface.
Another example is some service that may require moving from host to
host. It is easy to move the service together with its ipaddress bound
to loopback.
There are also some other examples when such settings may be useful.


>
>    $ ping -c1 127.111.222.123
>    PING 127.111.222.123 (127.111.222.123) 56(84) bytes of data.
>    64 bytes from 127.111.222.123: icmp_seq=1 ttl=64 time=0.104 ms
>
> I did absolutely nothing special to set that up.  I also routinely
> have an stunnel process listening on 127.0.0.25:465, and again, I
> did nothing special with the interface configuration or routing
> tables to allow that to work.
>
> --
> Bob Nichols     "NOSPAM" is really part of my email address.
>                Do NOT delete it.
>
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-- 
Dmitry Cherkasov


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