[TriLUG] Specifying fixed addresses using DHCP (was Re: enabling SSH into private network)

[Neil L. Little]

I have set a device (NSLU2) with a static IP underneath or over top of 
the DHCP range on a router using a DHCP server.
EX: DHCP range of say... 192.168.1.100-150 assign static addresses 
between 192.168.1.2-99 or 192.168.1.151-254

Also, going through a NAT use the same IP address but translate the 
ports. (but that can get confusing some times). Of course
if you are using a consumer router (Linksys) that has not been flashed 
with 3rd party firmware it might be problematic going this way.
I am using this port translation scheme to run more than one web server 
on one device (NSLU2). However it is a commercial (SMB)
grade router ( Cisco 851W).

73,
Neil, WA4AZL
JARS Forever!!

Lance A. Brown wrote:
> Jason Watts said the following on 1/2/2008 5:25 PM:
>   
>> being the non networking expert I am, didnt know that was possible.  I guess
>> the next question to be asked should be does his router support that :).
>>     
>
> That is a good question, if whatever is providing his DHCP doesn't do
> fixed assignments than he won't be able to do that. :-)
>
>
>   
>> With what you described.  does the router hold the IP's/mac's indef or for a
>> specified amount of time?
>>     
>
> On linux, using bind DHCP server, you do something like:
>
>         host wrt54g-bearsden {
>                 hardware ethernet 00:aa:bb:cc:dd:ee;
>                 fixed-address 192.168.0.10;
>         }
>
> to specify a fixed IP address for a mac address.
>
> On my WRT54G wireless router/access point, there is a configuration web
> page to specify IP addresses for specific mac addresses.
>
> --[Lance]
>
>
>