Question for Floobie

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Question for Floobie

Postby redwarrior666 » Wed Dec 27, 2006 12:35 pm

I have a question I think this will work ...when i get home I'm going to try it. I have an ISA server with three NIC's in it, one WAN and 2 LAN. The two LANs i will bridge with one ip address. One LAN goes to the access point and the other LAN nic goes to my comptuer. The purpose of this is to eliminate a switch as i only need 2 ports for this at home. Also I want ot run ISA Server 2006 and play with it.
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Postby FloobieDoobie » Wed Dec 27, 2006 2:16 pm

Yes it will work but it's not the best way to do it.
You will need to assign different subnets to each interface or else the routeing will get all fubar.
If both lans have the same subnet as in:
Lan1 = 192.168.1.1/24 (wireless)
Lan2 = 192.168.1.2/24 (to your PC)
Wan1 = 209.32.24.121/30

YourPC = 192.168.1.3/24
WirelessPC = 192,168.1.4/24

When you try to ping from your PC on Lan2 to the WirelessPC on Lan1 your NIC will simply attemp to connect right to it. You will issue an ARP request that says "Who has 192.168.1.4? Tell 192.168.1.3." Since your PC thinks that it's on the same network the packet will go out with a destination address of FF:FF:FF:FF , problem is this is not routable and your server Nic at 192.168.1.1/24 will see it and ignore it because it's not his address and it's not going to route a broadcast (that would be very bad).

If you make sure that you treat each interface as a seperate subnet then things will work. I'll use 24 bit (255.255.255.000) masks to make it easier but a 30bit (255.255.255.252) would work on the LAN2 and a 28bit (255.255.255.240) on the wireless segment to give you enough IPs for your wireless clients.
LAN1 = 192.168.1.1/24 (to wireless)
LAN2 = 192.168.2.1/24 (to your PC)
Wan1 = 209.32.24.121/30

YourPC = 192.168.2.2/24
Wireless = 192.168.1.2/24

Now when your PC tries to connect to a node on the wireless side it says "Hey 192.168.1.2 is not on my local network I need to send this to my default router to deliver". So it sends it to 192.168.2.1 (ISA Server) which then looks at it's route table and delivers it to LAN1 as it's route table tells it to. The node your pinging get the ICMP Ech request and sends out an ICMP Echo Reply back the same way.

Now I haven't played with the newest version of ISA and that may be able to do transparent bridging but you'll be opening up an annoying can of worms if it does.

PS: I used to teach a lab that had a very similar sort of feel to what you're doing. It's a great way to learn subnetting and supernetting.
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Postby redwarrior666 » Wed Dec 27, 2006 2:28 pm

Thanks Floobie you shed much more light on the subject for me.
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Postby rhonnin » Wed Dec 27, 2006 2:30 pm

It's so hawt when you guys talk all geek and stuff. Floobie, you sexy sexy man, have my babies.
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Postby FloobieDoobie » Wed Dec 27, 2006 2:45 pm

ROFL!
Rhonin's a Geeky-Chaser!
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Postby BigBossMonkey » Wed Dec 27, 2006 7:26 pm

OMG I UNDERSTOOD FLOOBIE!
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Postby FloobieDoobie » Wed Dec 27, 2006 9:37 pm

As long as you can understand, "It puts the lotion in the basket.", you'll be fine :)
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Postby jediknight » Thu Dec 28, 2006 7:40 am

dont hurt my fucking dog!
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Postby Gunther » Thu Dec 28, 2006 9:57 pm

FloobieDoobie wrote:As long as you can understand, "It puts the lotion in the basket.", you'll be fine :)

She puts the lotion in the basket.
She puts the lotion in the basket.
She puts the lotion in the basket.
Put the lotion in the Basket, Bitch!!
GuntertE, Lv 1, NC on Waterson
GunthertE, Lv3, TR on Mattherson
Landain, Lv3, TR on Jaeger
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Postby FloobieDoobie » Fri Dec 29, 2006 12:07 am

One of the best movies ever made.

BTW. Monkey what part did you understand?
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