Thanks for the info, I was afraid that was the case. I hope your holiday good.
Kim From: Reimer, Mark [mailto:[email protected]] Sent: Friday, May 25, 2012 4:16 PM To: NT System Admin Issues Subject: RE: subnetting question Yes. For a /22 mask, you need to be on a 4,8,12... boundary. As in your subnets below, the /23 all start with an even number and include the next number (16-17, 18-19, etc) As you probably know, masks are based on binary math. I can't quickly find a tutorial for this, but many exist, as do subnet calculators. For you Americans, have a great long weekend. Us Canucks had ours last weekend. Mark From: Kim Longenbaugh [mailto:[email protected]] Sent: Friday, May 25, 2012 2:58 PM To: NT System Admin Issues Subject: subnetting question I must not understand all I know about subnetting.... Here's the deal: I started out with these two subnets (I'm including the subnet and broadcast addresses): 172.16.8.0/22 = 172.16.8.0-172.16.11.255 172.16.12.0/22 = 172.16.12.0-172.16.15.255 I planned to segment my campus, so I planned to use the following subnets, which I wanted to have 512 addresses instead of 1024: 172.16.16.0-172.16.17.255/23 not in use yet 172.16.18.0-172.16.19.255/23 not in use yet 172.16.20.0-172.16.21.255/23 not in use yet 172.16.22.1-172.16.23.254/23 in use, working ok 172.16.24.1-172.16.25.254/23 not in use yet However, when I tried to use this subnet, with a /22 for 1024 addresses, my router doesn't like it, and when creating a DHCP scope, it tries to make a superscope. 172.16.26.0/22 = 172.16.26.0-172.16.29.255 It seems to me I should be able to do what I've described, but apparently I'm misunderstanding things. So one question is, why can't I do what I've outlined? Another way to put it is, if I want a /22 subnet, I still have to make them on the 4,8,12,16,20,24,28..... boundaries? ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected]<mailto:[email protected]> with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected]<mailto:[email protected]> with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
