SUMMARY: IP aliasing

From: Paulette Koble <pkoble_at_halcyon.com>
Date: Tue, 14 May 1996 16:37:44 -0700 (PDT)

Thank you to the following for answering my question about setting up
ip aliasing on our Alpha.

        Bob Morse <rem_at_MATH.AMS.ORG>
        jason andrade <jason_at_dstc.edu.au>
        Dave Cherkus <cherkus_at_UniMaster.COM>
        LAURA GRABINSKI <GRABILAU_at_aquinas.edu>
        Chris Jankowski <chris_at_lagoon.meo.dec.com>
        Gerhard Nolte <gnolte_at_gwdg.de>
        Arnaud Valeix <fnet_at_ifh.sncf.fr>
        Helgi Viggosson <helgi_at_ott.is>
        Ned Zaldivar <ned_at_uhdux2.dt.uh.edu>
        Peter Flack <flack_at_rtp4me.enet.dec.com>

>From Peter Flack--

See the man page on ifconfig - you can add multiple IP
aliases to each network interface using the alias option of ifconfig. If
you want these to remain after rebooting, you should create a script in
/sbin/init.d to do the alias(es) and then add a soft link from an "S"
script in /sbin/rc3.d and a "K" script in /sbin/rc2.d to start and stop
the aliases at the correct run levels. You can use a script like
/sbin/init.d/lpd to get an example script.

>From Chris Jankowski--

The main limitation is that the IP alias address must be from the same
subnet as the main IP address on the interface. Other configurations are
not supported and may cause unpredictable behaviour. This fact is
probably not well documented if at all. If you try to use IP alias from
different subnet several things may break. I have seen ARP breaking and
routing updates not send to this alias when the alias was not on the same
subnet as the main IP address.

A couple of respondents also sent copies of the scripts they use to set up
their own systems! Thanks to all for taking the time to respond.

pmk

_________________________________________________________________________
Paulette Koble -- System Administrator pkoble_at_halcyon.com
Northwest Nexus - Professional Internet Services Bellevue, WA USA
Voice: 206 455-3505 Web: http://www.halcyon.com/ Info: info_at_halcyon.com
Received on Wed May 15 1996 - 02:09:05 NZST

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