How Big Should Your LAN Be SAMIT Video



  • Youtube Video

    In the 1990s, we were all taught that networks should be no larger than a /24 or what used to be called a Class C network. But a lot has changed since then. How big should your LAN be today?



  • The timing on this might seem like I recorded it because of some other threads that were asking about this, but it just took a while to get posted. This was actually recorded a week or two ago.



  • @scottalanmiller

    Hi,

    I always opt for /24 and if working with big company where 254 machines/servers/printers wont be suffice go with
    /16, however I never used /21 /22 or /23

    Perhaps i should have used them, but in a sense /16 worked and seems responsive enough, even though it is way bigger than the slots I need



  • @emad-r said in How Big Should Your LAN Be SAMIT Video:

    @scottalanmiller

    Hi,

    I always opt for /24 and if working with big company where 254 machines/servers/printers wont be suffice go with
    /16, however I never used /21 /22 or /23

    Perhaps i should have used them, but in a sense /16 worked and seems responsive enough, even though it is way bigger than the slots I need

    You should not use arbitrary CIDR sizes like that. As with everything, it should be designed to fit the business.



  • @emad-r said in How Big Should Your LAN Be SAMIT Video:

    @scottalanmiller

    Hi,

    I always opt for /24 and if working with big company where 254 machines/servers/printers wont be suffice go with
    /16, however I never used /21 /22 or /23

    Perhaps i should have used them, but in a sense /16 worked and seems responsive enough, even though it is way bigger than the slots I need

    It also makes it bigger than it is possible to use, encouraging problems and the bigger you make it, the more likely you are to experience problematic overlaps.



  • @jaredbusch said in How Big Should Your LAN Be SAMIT Video:

    @emad-r said in How Big Should Your LAN Be SAMIT Video:

    @scottalanmiller

    Hi,

    I always opt for /24 and if working with big company where 254 machines/servers/printers wont be suffice go with
    /16, however I never used /21 /22 or /23

    Perhaps i should have used them, but in a sense /16 worked and seems responsive enough, even though it is way bigger than the slots I need

    You should not use arbitrary CIDR sizes like that. As with everything, it should be designed to fit the business.

    I wish I could upvote this a few more times. At my last job, they were using a /11 network! That gives something like 2million IP addresses per subnet, I think. This was in 2004, with a colllege of 1,000 people at most. I couldn't even use tools like Spiceworks because they would balk when I told them I wanted to scan 2 million IP addresses, lol.

    We fixed that later, of course.



  • Isn't that what they say in Texas...the more bigger, the more better...(sarcasm emoji)