VERY LATE SUMMARY: netmasks - using different netmasks for two ethernet ports

From: Dunstan_Vavasour (dunstan@cegelecproj.co.uk)
Date: Thu Mar 09 1995 - 15:49:06 CST


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I asked this question back in December.

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Subject: netmasks - using different netmasks for two ethernet ports
Author: dunstan@cegelecproj.co.uk (Dunstan_Vavasour) at xyz
Date: 12/13/94 9:48 AM

We are trying to reconfigure our network to use a reasonably limited
amount of addressing space. We have been allocated (don't ask me where
from - you don't want to know) two blocks of IP addresses, to whit
159.245.72-75 and 159.245.95-98. My routing machine is running SunOs
4.1.1 (to be upgraded to 4.1.4 later this week).
     
What we want to do is to run the whole block 72-75 as a large backbone
network, and then subnet the other addresses down into subnets of 32
hosts, so my routing machine will have attached to it
     
                      _________
159.245.72-75 ------ | machine | -------- 159.245.98.96-127
                      ---------
     
How do I do this ? My netmasks file entry is:
     
159.245.0.0 255.255.255.224
     
so do I need to do something weird with ifconfig in the boot scripts ?
Or is what I'm trying to do beyond the state of the art ?
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The bottom line is that we can't do it. I never understood if it was
actually not allowed within the IP subnetting standard or if it was
just SunOS4.1 which can't cope. But it is not possible to divide a
Class B address into different parts with different subnet masks (RIP
was cited as not supporting this).

Thanks to:

anthony@au.oz.aaii
Suzanne.Bryant@com.imagin1.internet
vuppala@cps.msu.edu
tag@mls.saic.com
scott@pccrisc.fda.gov
ukcphmr@ukpmr.cs.philips.nl
edward.kaczmarek@nrl.navy.mil
grevemes@VTC.TACOM.Army.Mil
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           __ | Dunstan Vavasour | Voice: (+44) 1788 563535
           \/ | | Fax: (+44) 1788 563763
----------------------- | Systems Design Divn |
| C E G E L E C | | CEGELEC Projects Ltd | Email: dv@cegelecproj.co.uk
----------------------- | Rugby, Warwickshire |
        Projects | CV21 1BU |
                         | United Kingdom |

GAT d++p+c++@lu+++e-(+)m++@s-/+n-(+)h----fg+w+(--)t+r-y?

CEGELEC Partout ou le present a de l'avenir
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