VLANs and subnetting

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VLANs and subnetting

Postby Celt » Sat Jan 18, 2014 8:34 am

OK, so been helping out a local charity with their network and stuff. they want to separate their backoffice network from their guest wi-fi, as they rent out their building for conferences. I've been looking at the Netgear SRX5308 WAN Firewall, which allows them to create multiple VLANs and route them both to the WAN connection (ISP) yet keep them isolated . . . all good . . . apart from security one of the reasons to do this is that they run out of IP addresses on their DHCP server (as they have lots of people in the office with PCs, smartphones, iPads, etc. The Wireless solution I have designed can create multiple SSIDs if you have VLANs, so the backoffice will get completely seperated from the usage of their hall, whiich can accomodate 400-500 people. All good, but then if they have a guest network, and we given that a class C of its own it will stil only have 250 or so IP addresses . . .

Here's the question . . . Can I create a /23 subnet (i.e. subnet mask of 255.255.254.0), so we get an IP address range of 192.168.10.1 through 192.168.11.254? And can DHCP provide that many IP addresses?
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Re: VLANs and subnetting

Postby Fuzz » Sat Jan 18, 2014 10:44 am

I'm sure it would depend on the DHCP server, are you planning on using the one built into the Netgear? We use a Sonicwall that allows a completely segregated WIFI guest network handled entirely by the sonicwall, while the other is handled by Windows Server. I haven't checked if it can do larger scopes, but I'd be surprised if it couldn't.
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Re: VLANs and subnetting

Postby Celt » Sat Jan 18, 2014 3:24 pm

Well we can do both. The Netgear can route to four VLANs and can do different DHCP configs on all four but we can implement DHCP on a Windoze box too . . . I was going to ask Netgear if the DHCP servers can handle anything larger than a Class C . . . If not then it's probably off to Cisco land . . .
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Re: VLANs and subnetting

Postby Fuzz » Sat Jan 18, 2014 3:58 pm

Cisco! eek! run away! hehehe I've been really happy with the sonicwall, if you end up looking for alternatives.
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Re: VLANs and subnetting

Postby Hammer_Time » Sat Jan 18, 2014 8:08 pm

Even though Sonicwall is now owned by Dell, it is still a great product!

http://community.spiceworks.com/product/3968-sonicwall

Super easy to setup too... I have not used it myself but numerous reviews on the product state that about it...robust and easy to set up... cannot be too bad if Dell bothered to buy the company... :)
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Re: VLANs and subnetting

Postby Fuzz » Sat Jan 18, 2014 9:18 pm

I wouldn't call them easy to setup. The wizards are helpful, but they are rather obtuse. Once you understand them, they are not bad, but they work a bit differently...
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Re: VLANs and subnetting

Postby Hammer_Time » Sat Jan 18, 2014 10:12 pm

... so does Celt!! :wink: :twisted: :mrgreen: Sounds like a match made in heaven then! :scout: 8) :D
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Re: VLANs and subnetting

Postby Celt » Sun Jan 19, 2014 1:19 am

Except I worry about a company that calls their product "NSA" :twisted:
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Re: VLANs and subnetting

Postby Sauron_Daz » Sun Jan 19, 2014 3:25 am

That should worry anyone...
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Re: VLANs and subnetting

Postby Celt » Sun Jan 19, 2014 2:17 pm

Had a look at those and they look promising . . . Have to strike a careful balance on cost v functionality but there are some attractive bundles especially on content filtering . . . Good call my sphenisciphobic friend!
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Re: VLANs and subnetting

Postby Sauron_Daz » Thu Jan 23, 2014 6:56 am

Celt wrote: Good call my sphenisciphobic friend!

:lol:
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Re: VLANs and subnetting

Postby Hammer_Time » Thu Jan 23, 2014 6:02 pm

Celt wrote:Had a look at those and they look promising . . . Have to strike a careful balance on cost v functionality but there are some attractive bundles especially on content filtering . . . Good call my sphenisciphobic friend!


Who you calling a "sphincter"???!!! :moon: :P :lol:

Oh, you meant this:

http://www.itsgoodtomock.com/2010/12/sp ... -nuns.html

sphenisciphobia - fear of nuns


I too fear them!!! FEAR THEM!!! Get thee to a Nunnery!!! :twisted: :mrgreen: :lol: :whistle:
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Re: VLANs and subnetting

Postby Sauron_Daz » Fri Jan 24, 2014 1:27 am

:lol: :lol:
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Re: VLANs and subnetting

Postby Celt » Fri Jan 24, 2014 4:25 am

Canadian dictionaries . . .:roll:

Fear of penguins laddie . . .
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Re: VLANs and subnetting

Postby DIREWOLF75 » Fri Jan 24, 2014 2:29 pm

Celt wrote:Canadian dictionaries . . .:roll:

Fear of penguins laddie . . .

:lol:

Well... The black&white combination looks similar, hmmm. :mrgreen:
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Re: VLANs and subnetting

Postby Sauron_Daz » Sun Jan 26, 2014 11:37 pm

:lol:
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Re: VLANs and subnetting

Postby Celt » Mon Jan 27, 2014 12:05 am

In the end we went for the simpler solution and got a Draytek Vigor 3900 . . . mostly because neither Cisco or Dell could be arsed to assist with such a small beer installation . . . which rules them out of any future work for this charity . . . EVER!
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Re: VLANs and subnetting

Postby Hammer_Time » Mon Jan 27, 2014 10:35 am

The richest man is not he who has the most, but he who needs the least. No good deed goes unpunished...

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Re: VLANs and subnetting

Postby Fuzz » Mon Jan 27, 2014 10:51 am

Never heard of them, British? I guess you just have to work around the problem of it taking a tea break at 2:00pm every day....
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Re: VLANs and subnetting

Postby Hammer_Time » Mon Jan 27, 2014 11:48 am

:mrgreen:

http://image.food-stock-images.com/rz_1 ... 66a282.jpg

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Just got back from walking the dog in -25C windchill right now ( I know that is warm for Dire but that is pretty darn cold for me!! Brrrr ), so now I am putting on a pot of tea, thanks for the reminder Fuzz!! 8) :D
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