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Conference turris::digital_unix

Title:DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:Welcome to the Digital UNIX Conference
Moderator:SMURF::DENHAM
Created:Thu Mar 16 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:10068
Total number of notes:35879

4141.0. "Multiple IP address to one H/W Interface" by ORO50::REEVES (Fire and Forget.) Sat Jan 27 1996 08:28

T.RTitleUserPersonal
Name
DateLines
4141.1KITCHE::schottEric R. Schott USG Product ManagementSat Jan 27 1996 10:503
4141.2EEMELI::SYVANENTero Syv�nen MCS @FNO 879-4567Sat Jan 27 1996 13:4410
4141.3Better performance if...RICKS::OPPSat Jan 27 1996 19:578
4141.4Beware of the subnet ...ZUR01::SUTTERWho are you ??? - I'm BATMAN !!!Sun Jan 28 1996 07:039
4141.5Really ?LEMAN::AGASSIShttp://www-mcs.geo.dec.com/Mon Jan 29 1996 09:4446
4141.6CRONIC::LEMONSAnd we thank you for your support.Fri Jan 03 1997 17:0149
4141.7VAXCPU::michaudJeff Michaud - ObjectBrokerFri Jan 03 1997 21:1710
4141.8CRONIC::LEMONSAnd we thank you for your support.Wed Jan 08 1997 11:347
4141.9SANITY::LEMONSAnd we thank you for your support.Fri May 02 1997 13:197
    Hi
    
    This question has reared its head again.  Is the use of aliases, as
    described in 4141.6, a 'supported configuration' under Digital UNIX?
    
    Thanks!
    tl
4141.10SANITY::LEMONSAnd we thank you for your support.Tue May 06 1997 22:234
    Should do an informational QAR on this?
    
    Thanks!
    tl
4141.11KITCHE::schottEric R. Schott USG Product ManagementTue May 06 1997 22:439
I don't see any question about aliases in .6

perhaps you can be more clear with your question...

there are aliases in the hosts file
there are aliases in mail
there are ifconfig -alias

I don't see you asking about any of them here.
4141.12SANITY::LEMONSAnd we thank you for your support.Mon May 12 1997 13:009
    Eric
    
    Thanks for asking for clarification.  Here is my question:  is the
    assignment of multiple IP addresses to a single adapter, using the
    ifconfig -alias method, a supported feature of Digital UNIX V3 and
    greater?
    
    Thanks!
    tl
4141.13KITCHE::schottEric R. Schott USG Product ManagementTue May 13 1997 04:192
Yup...we expect the addresses to be on the same subnet as
the interface.
4141.14SANITY::LEMONSAnd we thank you for your support.Tue May 13 1997 11:3426
    Thanks.  I have an FDDI adapter in a Digital UNIX server.  This server,
    which performs backups and restores over the network, takes care of
    backup clients in ~8 different IP subnets.  So, I've attached addresses
    in eight different subnets to this FDDI adapter, as in:
    
    ifconfig fta0 alias 16.127.32.4  netmask 255.255.255.0  # FAB 6 TOOL
    SEGMENT
    ifconfig fta0 alias 16.127.48.4  netmask 255.255.255.0  # FAB 6
    ifconfig fta0 alias 16.127.64.4  netmask 255.255.255.0  # WSM (Original
    WSM network)
    ifconfig fta0 alias 16.127.80.4  netmask 255.255.255.0  # WSM2
    (overflow network)
    ifconfig fta0 alias 16.127.192.4 netmask 255.255.255.0  # CIME
    ifconfig fta0 alias 16.127.208.4 netmask 255.255.255.0  # FAB 6 (2nd
    network)
    ifconfig fta0 alias 16.127.224.4 netmask 255.255.255.0  # SMT (ASD or
    UOG)
    ifconfig fta0 alias 16.127.240.4 netmask 255.255.255.0  # SMT
    ifconfig fta0 alias 16.128.0.4   netmask 255.255.255.0  # FINANCE, IM&T
    and MATERIALS
    ifconfig fta0 alias 16.128.160.4 netmask 255.255.255.0  # SPT
    
    Said this way, is this legal and supported?
    
    Thanks
    tl
4141.15not supportedSMURF::DUSTINWed May 14 1997 12:058
    Said that way, no, it is not legal and it is not supported.
    
    A related question might be, will it work?  The answer is it
    probably will work, although a few things might be a little
    flakey, depending on what you are trying to do...
    
    John
    
4141.16SANITY::LEMONSAnd we thank you for your support.Fri May 30 1997 16:1112
    Hi John
    
    Thanks for the response.  Rats.  May I poke at this a bit?  I believe
    it is legal to have two network adapters in the same system, each with
    a different IP address.  True?
    
    So what makes a single network adapter with two IP addresses illegal in
    Digital UNIX?  Windows NT supports this; it's one method used for
    offering multiple Web servers on a single system.
    
    Thanks
    tl
4141.17same subnet restrictionSMURF::DUSTINFri May 30 1997 18:3411
    Your particular addresses are in different subnets, which is
    the problem.
    
    Digital UNIX supports thousands of IP aliases associated with a
    single interface.
    
    Anyway, legal or not, it will probably work ok if you pay attention
    to routing tables and set things up right.
    
    John
    
4141.18SANITY::LEMONSAnd we thank you for your support.Mon Jun 02 1997 14:527
    Hi John
    
    You mentioned that "Digital UNIX supports thousands of IP aliases
    associated with a single interface."  So these addresses would all need
    to be in the same subnet, in order to be 'legal'?
    
    tl