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Re: [LUG] Linux - and security

 

On 03/11/12 11:46, Julian Hall wrote:

>> Most routers can give the same IP address to the same machine every
>> time, which in practise gives you static addresses. I think that's
>> good enough.
> Three ways of achieving that;
> 
> a) Turn off the router's DHCP server and assign all machines static
> internal IPs.  Will cause problems for anyone who visits you should they
> want access to the internet e.g. on a smartphone etc.  Come to think of
> it I don't think you can give any smartphone or a(ndroid) tablet a
> static IP at all, so if you plan on using one on WiFi for these this is
> not the option for you.  (I'm open to being corrected on the latter point).
> 
I do have a smart phone myself and use my wifi router to connect to the
internet on it. When my son visits he also uses my wifi on his phone!!

> b) Shift the IP range of the DHCP server up enough to allow space for
> the machines you already have, and then assign them static IPs.  e.g.
> 
> router IP range 192.168.0.2 -> 192.168.0.50
> 
> Alter the range to 192.168.0.5 -> 192.168.0.50 :- That gives you three
> free IP addresses at the bottom of the range to assign static to a
> desktop and two laptops - 192.168.0.2/3/4.
> 
> If however you add more machines at a later date you have to fiddle with
> the range again, potentially screwing up current connections.
> 
> c) Use IP reservations (assuming the function is available on your
> router.  This tells the router to give the same IP addresses to
> equipment based on their MAC addresses.  For example on my home system
> my desktop, WiFi printer and NAS all have reserved IPs, so as far as the
> network is concerned they're fixed.  However my phone and tablet cannot
> so they're dynamic and able to use the range available above the
> reservations, as is anyone who visits.  You still have to alter the
> reservations if you change equipment, but only on devices that change.
> 
> Julian
> 
Thanks for all that. I will have a look at how the router is set up and
take it from there.

Neil

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