Multiple Loopback Interfaces

[Reindl Harald]

BTW:

try to ping 127.0.0.1, 127.0.0.2, 127.0.0.3............

here they are pingable as default

the instruction below if only needed if the application
checks that a configured IP exists via ifconfig or lookalike

Am 29.08.2013 15:46, schrieb Reindl Harald:
> Am 29.08.2013 15:38, schrieb John Chludzinski:
>> I need to used multiple loopback addresses (interfaces) for an server
>> application that communicates with multiple clients running on the same
>> machine.  Since a loopback interface short circuits the network stack
>> (looping back in the IP layer) it is a more efficient means of
>> communication, hence better for my purpose.
>>
>> How do I define multiple loopback interfaces?
>>
>> BTW, I'm a newbie to this mailing mailing list.  Hopefully this is an
>> appropriate question?
> 
> if you are running network.service it's trivial
> NetworkManager -> no ida, i do not touch it
> ___________________________________________
> 
> [root at rh:/etc/sysconfig/network-scripts]$ cat /etc/sysconfig/network-scripts/ifcfg-lo:1
> DEVICE=lo:1
> IPADDR=127.0.0.2
> ONPARENT=yes
> 
> [root at rh:/etc/sysconfig/network-scripts]$ ifup lo:1
> 
> [root at rh:/etc/sysconfig/network-scripts]$ ifconfig lo:1
> lo:1: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>         inet 127.0.0.2  netmask 255.0.0.0
>         loop  txqueuelen 0  (Lokale Schleife)
> 
> [root at rh:/etc/sysconfig/network-scripts]$ ping 127.0.0.2
> PING 127.0.0.2 (127.0.0.2) 56(84) bytes of data.
> 64 bytes from 127.0.0.2: icmp_seq=1 ttl=50 time=0.056 ms
> ___________________________________________
> 
> that's the "lo" config shipped with Fedora
> 
> [root at rh:/etc/sysconfig/network-scripts]$ cat /etc/sysconfig/network-scripts/ifcfg-lo
> DEVICE=lo
> IPADDR=127.0.0.1
> NETMASK=255.0.0.0
> NETWORK=127.0.0.0
> # If you're having problems with gated making 127.0.0.0/8 a martian,
> # you can change this to something else (255.255.255.255, for example)
> BROADCAST=127.255.255.255
> ONBOOT=yes
> NAME=loopback

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