On Thu, Aug 29, 2013 at 08:32:56AM -0700, John Chludzinski wrote: > Both 127.0.0.7 and 127.0.0.10 exist in /etc/hosts for the client apps to > use when connecting to the server. The clients use both > gethostbyname() and getservbyname() for connecting. Currently, there > are *no* multiple loopback interfaces defined. > > I wrote my own example TCP socket code to test the set up and found > problems. > What problems? > Without defining multiple loopback interfaces using 127.0.0.7 and > 127.0.0.10, are 127.0.0.7 and 127.0.0.10 simply the same interface? > Yes. > BTW, this is code I inherited. > > ---John > > > On Thu, Aug 29, 2013, at 06:49 AM, Reindl Harald wrote: > > 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@rh:/etc/sysconfig/network-scripts]$ cat /etc/sysconfig/network-scripts/ifcfg-lo:1 > > > DEVICE=lo:1 > > > IPADDR=127.0.0.2 > > > ONPARENT=yes > > > > > > [root@rh:/etc/sysconfig/network-scripts]$ ifup lo:1 > > > > > > [root@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@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@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) Alternatively you can set /proc/net/ipv4/conf/l0/route_localnet to true -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
