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Re: Current recommended automatic laptop network configuration tools?

I use Ubuntu and I love Network Manager. I can set multiple profiles
for wired connections and more profiles for wireless connections. I
can set multiple profiles with different static IPs for each one. It
is wonderful. May be you should try.

Kind Regards,

2014-11-05 20:27 GMT-02:00 Michael Tria <mbtria@gmail.com>:
> I have a fondness for wired connections whenever possible. I think it makes
> a network faster, and more secure. Additionally there are almost always one
> or more dead spots in a home. This can be easily and cheaply resolved at
> work, but I am not sure how a home net-worker would take it.
> I also prefer static IP addresses to any variety of DHCP, although it is
> desirable to keep a 20-30 node range for DHCP, to allow testing and rapid
> installation of a system. Of course I have quite a few embedded systems all
> over the house, and they perform a variety of chores which are often
> dependent upon values obtained from another box in the house. Internal DNS
> resolution and or direct IP addressing can help make sure that
> communications between PCs are rock solid.
> Original MAC-IDs  are reputed to be world unique, but almost all cards and
> routers provide mechanisms for spoofing MAC-IDs. I understand there are ways
> of testing to see if the MAC-ID is original, but avoiding being dependent on
> MAC-IDs would seem to make the system safer, and less likely to corruption.
> Of course every-bodies situation is different. Wiring ethernet cables may
> not be feasible. You may have landlord problems, or physical difficulties. I
> live in my own house, and have access to almost all of the first floor from
> the basement, and have wiring to the important parts of the second floor.
> And I have a lot of embedded computers like Pi's, UDOO's, PCDuino's and more
> because I like to play with them, and the data they capture.
> Best wishes,
> Michael
> On Wed, Nov 5, 2014 at 4:28 PM, Bob Proulx <bob@proulx.com> wrote:
>> Brian Flaherty wrote:
>> > Like many, I have a laptop that I use in multiple settings:
>> > - home wired
>> > - home wireless
>> > - work wired
>> > - work wireless
>> > - roaming around (hotels, coffee shops, airports etc.)
>> Me too.
>> > Right now, I used wicd, but I get different IPs at home whether I'm on
>> > wired
>> > or wireless.
>> Each interface will have a different and unique ethernet MAC address.
>> The DHCP server will see each of those interfaces as a different
>> identity based upon the different ethernet address.  This is as per
>> standard practice for dhcp servers.  This is why your different
>> interfaces are getting different IP address assignments.  And if you
>> had both wired and wifi connected at the same time with the same
>> ethernet address it would cause routing confusion.  So this is all
>> good and by design.
>> > I'd like to set a static wired IP at home, but use dhcp wired
>> > at work.
>> > What do others do now with these sort of use patterns? Is whereami what
>> > I
>> > should learn to use? All the files refer to old kernels, APM, etc. Does
>> > it
>> > matter that it is not new?
>> As others have suggested you should instruct your dhcp server to
>> allocate the desired address.  Keep your interface using dhcp both
>> places.  At your home configure a static address for that dhcp
>> ethernet address.  Different dhcp servers call it different things.
>> Some home routers call it a dhcp reservation.  Others call it
>> different things.  But they should all have a way to configure that a
>> particular ethernet address is always allocated the same IP address.
>> If you do that then you will always get the same IP address at home
>> and will get a dynamic address at work and other places.  Easy.
>> If you want the same IP address on both wifi and wired that is a
>> little more interesting because they will have different ethernet
>> addresses.  If you promise not to connect both of them at the same
>> time then I would set the same ethernet address on both of them.  I
>> didn't test this so no guarantee but I think it would be worth a try
>> to try this:
>> $ cat /etc/network/if-pre-up.d/set-ethernet-mac-address
>> #!/bin/sh
>> address=so:me:ad:dr:es:sh:ere
>> ip link set $IFACE up address $address
>> That will set the ethernet address when the device comes up.  If you
>> set the same ethernet address for both eth0 and wlan0 then both of
>> those should negotiate the same address from your home router.
>> Note again that I didn't test the above so beware of problems that I
>> didn't anticipate.
>> > I found this page about netscheme.py:
>> >
>> > http://www.shallowsky.com/linux/networkSchemes.html
>> >
>> > I have to type with this one, whereas whereami sounds like it works in
>> > the
>> > background.
>> >
>> > I did also page through many months of debian-laptop, looking for
>> > threads
>> > about this, but nothing jumped out at me.
>> There are many different strategies all quite different all with the
>> same goal.
>> What I do is I set up OpenVPN on my laptop.  On the VPN network I
>> assign a static IP address.  My laptop always has a static address on
>> my VPN network and therefore the dynamically assigned IP address no
>> longer matters to me.  My router is also a Debian system and both it
>> and my mobile devices can easily run OpenVPN.
>> Bob

Marcos Alano

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