Changing subnet mask?
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@dashrender said in Changing subnet mask?:
@scottalanmiller said in Changing subnet mask?:
@siringo said in Changing subnet mask?:
I know the subnets are different, but with all devices having 10.0.0.x addresses I'm thinking they still may be seen by the /24 devices????
Yes, if everything falls within the scope of a /24, then all of the devices that are in a larger pool will keep working. But they ALL have to be already in the smaller pool and ONLY the subnet mask gets changed.
But again... why?
Forgetting about the - but why part...
The OP could make sure all devices are in the /24 before touching anything by changing DHCP to only hand out addresses in /24 range, then move by hand any staticly assigned devices into that range.
Yes, quite doable.
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@dashrender said in Changing subnet mask?:
@scottalanmiller said in Changing subnet mask?:
@siringo said in Changing subnet mask?:
I know the subnets are different, but with all devices having 10.0.0.x addresses I'm thinking they still may be seen by the /24 devices????
Yes, if everything falls within the scope of a /24, then all of the devices that are in a larger pool will keep working. But they ALL have to be already in the smaller pool and ONLY the subnet mask gets changed.
But again... why?
Forgetting about the - but why part...
The OP could make sure all devices are in the /24 before touching anything by changing DHCP to only hand out addresses in /24 range, then move by hand any staticly assigned devices into that range.
I gave that process above.
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@irj said in Changing subnet mask?:
@siringo said in Changing subnet mask?:
@dashrender said in Changing subnet mask?:
Then comes the question - does he have the gear needed to do that?
the answer is no, the answer to whether I have the desire or need is also no.
That's a very sad answer IMO
sorry to have disappointed you
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@dashrender said in Changing subnet mask?:
@travisdh1 said in Changing subnet mask?:
@jaredbusch said in Changing subnet mask?:
@travisdh1 said in Changing subnet mask?:
You're conflating VLANs with security.
You need to realize who you are talking to.
@IRJ is probably the most skilled security person on the community.
I know this, and statements like he made give me headaches after having to explain to other people that VLAN does nothing for security if you don't have firewall/access rules as well.
The types of places @IRJ has worked at, I agree that it would be insane to have a flat network.
This is my thoughts - most small businesses don't need/want more complexity than a flat network.
^^^ real world.
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@scottalanmiller said in Changing subnet mask?:
@siringo said in Changing subnet mask?:
Inherited an old SBS network which has been upgraded, but is still using the 10.0.0.0 /8 setup.
I was thinking of changing the subnet to /24.while the old addressing is insane, what's the reason to change? Unless there is a benefit, why? Just reducing the address pool isn't going to buy you anything.
Yes this ^^^ exactly Scott. I'm of the same mind, that's part of why I threw the question out there, I wanted 2nd opinions.
Everything is working fine ATM, why would I want to make an unneccessary change that provided no benefit but could introduce downtime. I susbcribe heavily to the KISS principal, hence my lack of interest in VLANing in this instance.
The only reason I came up with, when thinking about the change is that it may make the environment 'look' more professional by having a more appropriately scoped, network.
Thanks for all the opinions and information it is all greatly appreciated.
