Date: Thu, 10 May 2001 13:35:34 -0400 From: "Gerald T. Freymann" <freymann@eagle.ca> To: "Wayne Pascoe" <wayne.pascoe@realtime.co.uk> Cc: <freebsd-questions@FreeBSD.ORG> Subject: Re: TCP/IP Subnetting Message-ID: <005b01c0d977$9e4b1430$0f01a8c0@phantom> References: <86r8xxnncd.fsf@pan.penguinpowered.org.uk>
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> I have a /25 IP range that I need to subnet. I need to give 4
> addresses to one network and the remaining addresses to the other
> network.
But you also must remain in the proper boundaries of subnetting. You may
find you can't split it exactly as you want, but at least something close.
If you have a look here:
http://www.again.net/cidr
You want a 4 useable IP subnet... but it shows 2, 6 and 14.
Network A:
Network Address: 192.168.1.128
Broadcast Address: 192.168.1.135
Subnet Mask: 255.255.255.255.248
Range: 192.168.1.129 - 192.168.1.134 (6 useable Addresses)
Network B:
Network Address: 192.168.1.136
Broadcast Address: 192.168.1.255
Subnet Mask: 255.255.255.136
Range: 192.168.1.137 - 192.168.1.254 (118 useable Addresses)
But how much you wanna bet a subnet of 255.255.255.136 is invalid? I dunno.
When subnetting there have areas where I thought hey, I can just split it
here, and there, using variable length subnet masks, but when I go to the
router to enter it, it whines.
My guess is you'll likely have to stick with the CIDR prefix lengths.
Possibly splitting your half a Class C into 3 or 4 pieces. Just a wild,
wild guess.
-gf
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