SUMMARY: VLSM and Solaris

Date: Thu Oct 16 1997 - 12:36:06 CDT

Thanks to the following for their responses:

Stephen <>
Casper Dik <>
Scott Woods <>
Benjamin Cline <>

The Question:
Is variable-length subnet masking (VLSM) not supported until
Solaris 2.6? Or are there any workarounds/patches for earlier
I am looking at putting a Solaris-based webserver on the DMZ of
an NT-based FireWall-1 setup, and am wondering if I will need to
use an entire subnet for it.

The Summary:
Solaris versions before 2.6 can use non-class A/B/C subnet masks
on local networks only, since the route command has no provision
for a subnet mask to be specified. So a Solaris-based webserver
should be just fine with a partial subnet mask (specified with
ifconfig), since it's not doing any routing. In fact, you should
be able to split a class C subnet between the outer and DMZ
subnets on a Solaris-based Firewall-1 box as well, as long as
any non-local internal networks have standard netmasks.

Derek Schatz

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