Without a proper understanding of the fundamentals, you could very easily make part of, if not all of your network unusable. A subnet calculator is a handy little tool, but you really should have a good grasp of the underlying concepts before taking on a challenge of [re]subnetting your network.
A prerequisite to IP Addressing and Subnetting is understanding Binary and Decimal numbers. And I can tell you from an experience, if you are re-configuring switch or router, you assuredly want to do it from the command line and have full-control of what you are doing. There are web interfaces out there that will take additional liberties with settings based on what you choose in the "wizard" interface. -- Espi On Tue, Jan 10, 2012 at 11:23 AM, Don Ely <[email protected]> wrote: > " No I'm fighting with my switches to change to /22, looks like my Dell > switches I have to connect the cable and do it from the CLI command line, > can't edit the IP in the GUI! " > > That's for a very good reason that most networking experts would > understand without even attempting... > > > On Tue, Jan 10, 2012 at 9:24 AM, Stefan Jafs <[email protected]>wrote: > >> No I did not but i got the idea, i used the "Advanced Subnet Calculator" >> that shows me all my IP's. >> >> No I'm fighting with my switches to change to /22, looks like my Dell >> switches I have to connect the cable and do it from the CLI command line, >> can't edit the IP in the GUI! >> >> Stefan >> >> On Tue, Jan 10, 2012 at 11:36 AM, Micheal Espinola Jr < >> [email protected]> wrote: >> >>> Are you guessing, or did you try writing it out as explained to you? >>> >>> -- >>> Espi >>> >>> >>> >>> >>> >>> On Tue, Jan 10, 2012 at 7:37 AM, Stefan Jafs <[email protected]>wrote: >>> >>>> So for me *.255 are usable exept 3.255, correct? >>>> >>>> Stefan >>>> >>>> On Mon, Jan 9, 2012 at 11:00 PM, Ben Scott <[email protected]>wrote: >>>> >>>>> On Mon, Jan 9, 2012 at 7:32 PM, Heaton, Joseph@DFG <[email protected]> >>>>> wrote: >>>>> >>> .255 is broadcast >>>>> >> >>>>> >> Not always. >>>>> > >>>>> > Very true, if we go and break up a class C, that is absolutely true. >>>>> But, >>>>> > seeing as he's going the other way, and making the subnet bigger, >>>>> not smaller... >>>>> >>>>> ".255" is still not always the broadcast address. For example, in a >>>>> /23, there will be two addresses where the dotted-decimal ends in >>>>> ".255". One will be the broadcast address, and the other will just be >>>>> a regular host. >>>>> >>>>> -- Ben >>>>> >>>>> ~ 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 >>>>> >>>>> >>>> >>>> >>>> -- >>>> Stefan Jafs >>>> >>>> ~ 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 >>>> >>> >>> ~ 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 >>> >> >> >> >> -- >> Stefan Jafs >> >> ~ 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 >> > > ~ 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 > ~ 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
