[GRLUG] finding dhcp lease info

[Mike Williams]

+1 to this. A while back, the newer versions of the venerable WRT54G 
series of routers started shipping with much weaker hardware and a 
VxWorks operating system instead of the classic Linux firmware. Not 
coincidentally, they also started to suck at the same time! I recommend 
Tomato firmware if your device can take 3rd party builds. I ran it on my 
current router for years, only replacing it because my box doesn't have 
enough memory to run a 2.6 kernel.

As I understand it, a DHCP reservation for a particular device can be 
added within the scope of the dynamically assigned ones. I think that's 
even the official way, although all but the stupidest firmware could 
hand one out from outside the range also.

On 01/25/2014 01:11 AM, Dave Chiodo wrote:
> Sounds screwy. But with the canned firmware those things comes with, 
> who knows. I tend to avoid the "stock" firmware and prefer OpenWRT or 
> Tomato.
>
> I can't imagine any reason having some fixed-IP devices would be a 
> problem. Technically even if they were in the DHCP range it should be 
> ok, as the DHCP service SHOULD do a ping to make sure an address isn't 
> claimed before assigning it. (keyword "should" - so probably better to 
> keep them non-overlapping)
>
>
> On Fri, Jan 24, 2014 at 9:55 PM, Eric Beversluis 
> <ebever at researchintegration.org 
> <mailto:ebever at researchintegration.org>> wrote:
>
>     On Fri, 2014-01-24 at 21:28 -0500, Dave Chiodo wrote:
>     > The guy sounds like he has no idea what he's talking about.
>     >
>     >
>     > Are you trying to get the IP address that has been assigned to the
>     > router from upstream(the ISP)?
>     >
>     >
>     > Or are you trying to see which IP's its DHCP server to client
>     > PCs/devices?
>     >
>     Just wanting to see which leases the router has provided to my various
>     computers and printers. The attached devices list doesn't give all the
>     outstanding leases and, for some reason, doesn't show the address
>     assigned to the Mac, just shows its MAC and dashes in the IP addr box.
>
>     It's probably worth my while to reset the router to fac default and
>     reconfig it to see if that helps.
>
>     Is there any reason that having some devices with fixed IP addresses
>     should cause problems for a lower end router like this? There's no
>     overlap with the assigned DHCP range.
>
>     >
>     >
>     >
>     >
>     >
>     > On Fri, Jan 24, 2014 at 7:36 PM, Eric Beversluis
>     > <ebever at researchintegration.org
>     <mailto:ebever at researchintegration.org>> wrote:
>     >         I just spent a frustrating time (incl 20+ min waiting)
>     on chat
>     >         with
>     >         Netgear to learn how to find the dhcp leases on one of their
>     >         wireless
>     >         routers (WPN824N). After being hassled for when and where I
>     >         bought it (I
>     >         thought Microcenter, but wasn't sure) the guy finally said
>     >         that you
>     >         couldn't find the info there but had to look at the modem.
>     >
>     >         "As I checked my resources about the concern, there is no
>     >         settings in
>     >         the router which you can configure and view the DHCP list.
>     >         Because it
>     >         can only be found on the modem's interface.
>     >         Eric Beversluis: ???? That's never been the case with any
>     >         other wireless
>     >         router I've had. The moden wouldn't know anything about it
>     >         since the
>     >         NAT'ing is done with the router.
>     >         Johnpaul Delatorre: You can check on the modem's interface
>     >         where to
>     >         locate the list of DHCP leases and how to configure it."
>     >
>     >         Am I totally wrong in thinking this was nonsense? The router
>     >         is doing
>     >         the NAT'ing and assigning the DHCP leases, so why would that
>     >         info be on
>     >         the modem and not on the router?
>     >
>     >         I'm thinking they just didn't bother to make that info
>     >         available on this
>     >         particular model. But why would they do that? Surely
>     it's just
>     >         some
>     >         boilerplate coding to include in the webconfig pages. I
>     don't
>     >         think I've
>     >         ever had a wireless router that didn't show this.
>     >
>     >         Or am I all wet?
>     >
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