VLSM and Solaris

2007-12-25 11:33:00

Thanks to the following for their responses:

Benjamin Cline <benji@hnt.com>

The Question:

-------------

Is variable-length subnet masking (VLSM) not supported until

Solaris 2.6? Or are there any workarounds/patches for earlier

versions?

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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