Re: 16 bit subnet segmentation

You'll need another NIC in the ISA box or you'll need to buy a router.

"RickyVene" <RickyVene@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:E22363D1-A5A0-4323-BA5D-EEF761534F38@xxxxxxxxxxxxxxxx
Can you tell me the basic connections? I have ISA 2004 edge firewall. So
how I connect this on the internal?

Thanks,
Ricky

"Neteng" wrote:

As Phillip mentioned, a router.

"RickyVene" <RickyVene@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:8FDAC361-3975-436A-9BC3-0986845D1D22@xxxxxxxxxxxxxxxx
Are you saying that 16 bit segments can communicate with 24 bits? By
what
devices I need to use?

Please advise more.

Thanks,
Ricky

"Phillip Windell" wrote:

"RickyVene" <RickyVene@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:07E26D90-19FA-4317-B453-8BD412AD1817@xxxxxxxxxxxxxxxx
I'll try that segmentation, but what is the best way to do that?
By
bridges
or by router segmentation.

Bridges are just another name for Switches. Switches are Layer2.
Segmenting
is Layer3, Routers are Layer3,...so you have to use a Router. There
are
a
lot of devices being sold now that are both a Router and a Switch in
the
same box,...they are called Layer3 Switches. These are a very good
option,
just be sure to keep separated in your mind the router functionality
from
the switch functionality even though it is happeing in the same box.

How about the L2TP/IPSEC for VPN on ISA 2004? Right now, I'm only
using
the
PPTP protocol. Is it advisable to go to ipsec?

VPN is already encapsulated with just using PPTP,...that's what PPTP
is.
I
have never messed with L2TP/IPSec,...it has never even interested me
or
made
me curious enough to try. Some people love it,...I couldn't care
less
about it. Your choice. I have also never wanted to spend the $$ to
buy
the
Certs to do it and the MS Cert Services is just too big of a hassel
to
mess
with for me.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com


Thanks,
Ricky




"Phillip Windell" wrote:

You can add two 24bit segments alongside of the existing ones and
migrate
to
the new segments over a period of time. If you can wittle down
the
16bit
segment to less than 254 Hosts and have them grouped into IP#s
that
fall
into a 24bit range,...then all you have to do is change the mask.
At
that
point even the mask can be changed over time because both a 16
and 24
bit
mask would work for those simultanously.

Once the original 16 segment is split into 24bit segments you
could
even
get
rid of the new ones you created that aren't needed anymore. It
is up
to
you
how to deal with that.

Once you are out of the woods with all this,...always keep your
segment
at
254 hosts or less (24bit mask). Ethernet looses effieciency after
about
300
hosts per segment. It is even true with gigbit however it just
isn't
as
noticable to "humans".

IPSec is not meant for running between every Host on a LAN. That
is
horrible. IPSec has a high overhead. It was intended to be used
in a
"point-to-point" situation like maybe a WAN link between two
sites.

IPSec's primary purpose is to prevent "eavesdropping" by Sniffers
by
encrypting the packets. On the Local LAN your Switches already
do
that
by
isolating the session between a pair of "talking" hosts to its
own
"virtual
circuit". You have to specifically configure the Switch with a
Monitoring
Port to use a Sniffer. So you don't need IPSec for that.

You can do "firewall-like" filtering with IPSec too, but you can
do
that
without IPSec anyway, so what's the point? Plus the LAN has to
be
almost
"wide open" just to function normally, so there isn't a lot of
filtering
even possible there.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com




"RickyVene" <RickyVene@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message
news:9596A79B-CDFF-4E5A-A9D1-B269091F5224@xxxxxxxxxxxxxxxx
Hi,

I have a 16 bit subnet which is hard to administer especially
with
Network
speed.

I disable my ghost because it's a network killer.

Can I do segmentation with 16 bit subnet with another router?

I need also to implement IPSEC. Does this going to be a big
impact
on
it?

Can't change my subnet, it's a big task and additional fees
because
our
integrated VOIP, UNIX and others are already in-placed.

Please advise.

Thanks,
Ricky











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