[App_rpt-users] New ACID release - BeagleBoard MAC Address

[Keith Williamson]

You might consider writing a simple script that issues a "gratuitous" arp to
the router and run it in rc.local (or equivalent).

Cheers,

Keith
KF7DRV
Allstar: 2541

On Thu, Aug 25, 2011 at 10:01 PM, Kevin Walsh <w8khw1 at gmail.com> wrote:

> Hi Jim,
>
> Thanks as always for the timely response.
>
> My requirement has nothing to do with DHCP. I believe that was the
> problem from the earlier post I mentioned, but that's not the problem
> herre.
>
> My BeagleBoard configuration is using a static IP address, the content
>  /etc/network/interfaces is posted below:
>
> #Static IP configuration
> auto lo
> auto usb0
> iface lo inet loopback
> iface usb0 inet static
> address 172.22.32.132
> netmask 255.255.255.0
> gateway 172.22.32.1
>
>
> (Note - I attempted to add the hwaddress tag to force a fixed mac
> address, but id didn't work.)
>
> The problem is that when the mac address of a device changes, the
> content of the arp table on my firewall can no longer talk to the
> BeagleBoard - because the MAC address changed. (IP address equals MAC
> address in arp lookup table, right?) If I clear the arp table on the
> firewall and then attempt to contact the BeagleBoard at the above
> static IP address, it will learn the new MAC address and associate the
> new MAC with the static IP. That all works fine until the BeagleBoard
> is re-started for whatever reason - and the whole problem above starts
> again.
>
> I would hate to have to put the BeagleBoard outside the firewall and
> dedicate a static routable IP address to just this device.
>
> Hope that helps explain the problem.
>
> 73,
> Kevin
> W8KHW
>
>
>
> On Thu, Aug 25, 2011 at 11:16 AM, Jim Duuuude <telesistant at hotmail.com>
> wrote:
> > This "somewhat misfeature" of Pickle (or at least the Ubuntu distro) was
> > never intended. However when it was first pointed out to me a realized
> > how much of an incredible blessing in disguise it was.
> >
> > The reason being is: Threre is NEVER, EVER, EVER, *ANY* reason
> > why ANYONE should trust a "toy" router to even accurately keep track of
> > much less observe static DHCP bindings. That is *JUST NOT* an acceptable
> > way of assigning a "static" LAN IP address.
> >
> > Routers that allegedly support this "feature" (boy that's being nice)
> > generally
> > don't very well and/or stably. I have had NOTHING BUT HEADACHES over
> > the year when people attempt to do this. PLEASE, DONT LET IT HAPPEN
> > TO YOU.
> >
> > Just assign a *REAL*static LAN IP on the Pickle system. Use the netsetup
> > script if you arent comfortable with editing files in the Ubuntu distro.
> > Assign
> > a LAN IP address that is outside the range that the router assigns DHCP
> > addresses. Sometimes, in rare cases, some routers will, by default
> > use the entire LAN range for assigning DHCP address. If so you
> > will need to configure the router to change this behavior, and "create"
> > a range of LAN addresses outside the routers range of DHCP addresses.
> >
> > Believe me, this small amount of extra work when setting up a system
> > TOTALLY is worthwhile and WILL save you some major grief in the future.
> >
> > JIM WB6NIL
> >
> >> Date: Thu, 25 Aug 2011 02:21:19 -0400
> >> From: w8khw1 at gmail.com
> >> To: app_rpt-users at ohnosec.org
> >> Subject: [App_rpt-users] New ACID release - BeagleBoard MAC Address
> >>
> >> Hi,
> >>
> >> I was wondering if the next pickle image might address the random MAC
> >> address issue. I saw there was a thread earlier on the list about this
> >> issue, but didn't find a resolution. I have found several references
> >> to "patches" that will correct the problem, but haven't really had
> >> time to dive into the issue. I did try setting a static MAC in the
> >> network config, but that didn't seem to work by itself.
> >>
> >> The main issue I need to resolve is that I create a static NAT
> >> translation through my firewall to the BeagleBoard (based on the IP
> >> address). The firewall caches the MAC address associated with that IP
> >> address in the arp table, so when the BeagleBoard is re-started (and
> >> the MAC address changes) it will no longer work through the firewall
> >> unless I clear the firewall's arp table.
> >>
> >> 73
> >> Kevin
> >> W8KHW
> >>
> >> On Mon, Aug 22, 2011 at 6:14 AM, Jim Duuuude <telesistant at hotmail.com>
> >> wrote:
> >> > Its there now.. and no, the ISO file generally does not
> >> > change when a new release comes out.
> >> >
> >> > JIM
> >> >
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> >> App_rpt-users at ohnosec.org
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> >
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