I have two questions regarding using the all ones and/or the all zeros
subnet.
Recently one of my co-workers started studying for CCNA and while
reviewing subnets he kept telling me that you could not use the all zero
or all ones subnet. The Win95, NT, and LINUX hosts didn't have a
problem with it nor did the routers. I tested it with RIP & EIGRP.
(skipped OSPF since it is classful).
I found that Cisco and others vendors agree that it will work, but they
"Strongly discourage using the all ones or all zeros subnets"
PS: if some of you try testing this; note that prior to 12.1 you'll need
to enter
(config)# ip zero-subnet
before the router will accept a zero subnet on a interface. Starting in
12.1 the zero subnet is enabled by default.
Question #1: What type problems could you run into by using a all
ones/zero subnet.
Question #2: For you folks that are in design; Do you follow or
ignore the "DO NOT USE ALL ONES/ZEROS" rule?
I'm trying to get a real world idea of what the standard practice is.
I work at a large corp, so I haven't a clue what sane people do.
DaveC
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=695&t=695
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