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Greg Rundlett (freephile | 1 Sep 2009 16:41
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Help connecting to two networks (Adding a virtual interface)

I need a little help with networking.  I'm running Ubuntu Jaunty Jackalope 09.04

I have a LAN that has 2 separate logical networks. I want to be able
to have my PC be on both networks so that I can SSH to an Asterisk
server on the second LAN.  The PC LAN is 192.168.5.1-255 and the VoIP
LAN is 192.168.2.1-255.

Both lans use the same physical network. Vlan tagging separates the traffic.

How do I configure my notebook to be on both networks? I'm currently
using wireless (not using my wired interface at all) making it easier
to got to get up and go into a conference room.  I assume I need to
add a virtual interface on my wireless card so that I can be on both.
What is the preferred method to add a virtual interface?

I use Network Manager Applet which doesn't seem to touch
/etc/network/interfaces, yet I've seen posts that describe putting
something like the following in /etc/network/interfaces

auto wlan0
iface wlan0 inet dhcp
    netmask 255.255.255.0
    network 192.168.5.0
    broadcast 192.168.5.255
    gateway 192.168.5.1

auto wlan0:1
iface wlan0:1 inet dhcp
    netmask 255.255.255.0
    network 192.168.2.0
(Continue reading)

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Ben Scott | 1 Sep 2009 18:00
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Re: Help connecting to two networks (Adding a virtual interface)

On Tue, Sep 1, 2009 at 10:41 AM, Greg Rundlett
(freephile)<greg@...> wrote:
> Vlan tagging separates the traffic.
> How do I configure my notebook to be on both networks?

  You need to tell the OS that you want it to recognize VLAN tags on
the interfaces.  You'll then get multiple interfaces of the form
"foo0.1", where 0 is the physical interface number and 1 is the VLAN
ID.  You can also still use "foo0" for untagged frames, if that's how
the network is configured.

  Note that is a dot (.) not a colon (:).  (Colons are used for
interface aliases, which is a way to do multiple IP addresses on one
physical interface, while maintaining the illusion of multiple
interfaces for programs which can't handle multiple IPs on a single
logical interface.  (You can do the same thing easier with multiple
"ip addr add dev foo0" invocations, but some software assumes
"interface == address".))

  The manual way to configure a VLAN interface is with the vconfig(8)
command.  For example:

	vconfig add eth0 42

will create the "eth0.42" VLAN interface.

  I don't know the way to configure VLANs with Debian/Ubuntu config automation.

  For Red Hat, you can create an "ifcfg-foo0.1" interface description
file, add "VLAN=yes", specify "DEVICE=foo0.1", and the rest happens
(Continue reading)

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Greg Rundlett (freephile | 1 Sep 2009 19:02
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Re: Help connecting to two networks (Adding a virtual interface)

On Tue, Sep 1, 2009 at 12:00 PM, Ben Scott<dragonhawk@...> wrote:
> On Tue, Sep 1, 2009 at 10:41 AM, Greg Rundlett
> (freephile)<greg@...> wrote:
>> Vlan tagging separates the traffic.
>> How do I configure my notebook to be on both networks?
>
>  You need to tell the OS that you want it to recognize VLAN tags on
> the interfaces.  You'll then get multiple interfaces of the form
> "foo0.1", where 0 is the physical interface number and 1 is the VLAN
> ID.  You can also still use "foo0" for untagged frames, if that's how
> the network is configured.
>
>  Note that is a dot (.) not a colon (:).  (Colons are used for
> interface aliases, which is a way to do multiple IP addresses on one
> physical interface, while maintaining the illusion of multiple
> interfaces for programs which can't handle multiple IPs on a single
> logical interface.  (You can do the same thing easier with multiple
> "ip addr add dev foo0" invocations, but some software assumes
> "interface == address".))
>
>  The manual way to configure a VLAN interface is with the vconfig(8)
> command.  For example:
>
>        vconfig add eth0 42
>
> will create the "eth0.42" VLAN interface.
>
>  I don't know the way to configure VLANs with Debian/Ubuntu config automation.
>
>  For Red Hat, you can create an "ifcfg-foo0.1" interface description
(Continue reading)

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Bill McGonigle | 1 Sep 2009 21:45
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Re: Help connecting to two networks (Adding a virtual interface)

On 09/01/2009 10:41 AM, Greg Rundlett (freephile) wrote:
> Vlan tagging separates the traffic.
> 
> How do I configure my notebook to be on both networks? I'm currently
> using wireless

IIRC, many wireless AP's don't support 802.1q in 802.11.  You might get
away with multiple SSID's, if the hardware supports that, one for each
network.  I don't think the Network Manager GUI supports that, though.
Then there's hardware/driver support (a second USB NIC is an easy, but
ugly workaround).  You'd at least have to tag the WAP's ethernet port
with both VLAN's, or if it knows how to do VLAN's, just trunk it.

Even with 802.1q in 802.11 support I don't think you'll get any QoS on
the wireless side, so why not just dump all the traffic onto the
wireless un-tagged and then use a simple ethernet alias on the laptop?

-Bill

--

-- 
Bill McGonigle, Owner
BFC Computing, LLC
http://bfccomputing.com/
Telephone: +1.603.448.4440
Email, IM, VOIP: bill@...
VCard: http://bfccomputing.com/vcard/bill.vcf
Social networks: bill_mcgonigle/bill.mcgonigle
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Bill McGonigle | 1 Sep 2009 21:54
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Re: Simple email list setup

On 09/01/2009 08:14 AM, Larry Cook wrote:
> If you'd be willing to give me an example rule for matching the From
> address and forwarding on that would be really helpful with my learning
> process.

the syntax is pretty arcane, but 'man procmailex' is really useful.

Something along the lines of:

  :0                                      # new rule
  * ^From:.*authorized-user <at> example\.com  # match your user's From
  * ^TO_.*fake-list-address <at> example\.com  # match TO, CC
  !real-list-address                      # forward, possibly local

  :0                                      # new rule (last didn't match)
  * ^TO_.*fake-list-address <at> example\.com  # to the list (but not authed)
  /dev/null                               # bitbucket (or autoresponder)

(strip out the comments, check the syntax, etc.)

-Bill

--

-- 
Bill McGonigle, Owner
BFC Computing, LLC
http://bfccomputing.com/
Telephone: +1.603.448.4440
Email, IM, VOIP: bill@...
VCard: http://bfccomputing.com/vcard/bill.vcf
Social networks: bill_mcgonigle/bill.mcgonigle
(Continue reading)

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Bill McGonigle | 1 Sep 2009 22:09
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Re: Wifi <at> Nashua Library?

On 08/26/2009 04:53 PM, Neil Joseph Schelly wrote:
> I've been on public networks before where I can't get a DHCP response, while 
> Windows users don't have a problem.  I've never come up with a thorough 
> explanation and it's rare enough for me that I've never really investigated.

I have a vague recollection of one time having to ask dhcpcd to send a
certain option in the dhcp request to get a server to respond.  It was
basically just mimicking Windows, and nothing important - probably a bug
in the dhcp server (only tested against windows machines, perhaps).

-Bill

--

-- 
Bill McGonigle, Owner
BFC Computing, LLC
http://bfccomputing.com/
Telephone: +1.603.448.4440
Email, IM, VOIP: bill@...
VCard: http://bfccomputing.com/vcard/bill.vcf
Social networks: bill_mcgonigle/bill.mcgonigle
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Ted Roche | 1 Sep 2009 22:47
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Fwd: Pearson Education User Group Program Newsletter -- September 2009

Some good deals and discounts. Note the 35% off Python books!

-------- Original Message -------- Subject: Date: From: Reply-To:
Pearson Education User Group Program Newsletter -- September 2009
Tue, 1 Sep 2009 16:26:10 -0400
InformIT User Groups <usergroups-bJzBLHNCuvtWk0Htik3J/w@public.gmane.org>
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Ben Scott | 1 Sep 2009 23:37
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Re: Simple email list setup

On Fri, Aug 28, 2009 at 8:56 AM, Larry Cook<lcook@...> wrote:
> I am looking for suggestions on setting up a simple announcement email
> list with about 50 static members (no self-subscribe/unsubscribe), of
> which only 4 members can send to the list.

  Okay, I've watched the suggestion traffic flow by, and since nobody
has come up with something really good, let me suggest GNU Mailman.
You're right, it is overkill for what you want, but on the other hand
it comes pre-configured with many distributions, and management is
wicked easy with the web UI.  Plus once you have it, you may find
other uses for it.

  Yell if you need help setting it up for the first time.  In most
distros, you only need a handful of commands, all of which are pretty
easy.  Typically it will be something like:

yum install mailman
mailman newlist mailman
mailman config_list -i /usr/share/mailman/data/sitelist.cfg mailman
mailman msitepass

  Then browse to <http://server.example.com/mailman/admin/mailman> to
subscribe yourself to the site-wide "mailman" list (used for system
notifications).

  Then browse to <http://server.example.com/mailman/create> to create
the list for your users.  Follow the prompts.  Done.

  I did it for GNHLUG's server not long ago, when I had to rebuild the
server after the disk crash, and it wasn't hard at all.

-- Ben
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Ben Scott | 1 Sep 2009 23:49
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Re: Help connecting to two networks (Adding a virtual interface)

On Tue, Sep 1, 2009 at 3:45 PM, Bill McGonigle<bill@...> wrote:
> IIRC, many wireless AP's don't support 802.1q in 802.11.

  Why would the AP care?  VLAN frames are just regular Ethernet
frames, but with a particular frame type that VLAN-aware nodes
recognize as the VLAN tag.  Equipment that isn't VLAN-aware should
just see it as an unknown frame type.  VLANs even eat up a few bytes
of the regular Ethernet MTU.

  (Note that I'm not arguing against the possibility or actuality.
I've learned that tech mfgs could screw up a one-man parade in a ghost
town.  But I'm still curious as to why/how.)

> Then there's hardware/driver support ...

  If we're talking strictly Linux, VLANs are implemented in the
generic link-layer, above the NIC drivers.  It's not like 'doze where
the NIC drivers are actually responsible for VLAN implementation.

> You'd at least have to tag the WAP's ethernet port
> with both VLAN's ...

  You could also run one VLAN tagged and the other untagged, if you
have existing stuff you don't want to mess with, but that stuff only
needs one VLAN.  For example, Windows clients.

> Even with 802.1q in 802.11 support I don't think you'll get any QoS on
> the wireless side ...

  Probably not with the typical SOHO stuff, i.e., LinkSys, NetGear,
etc.  I've heard of (but not looked into) "enterprise grade" WAPs
which can do QoS for VoIP applications.  I have no idea how well they
work myself, although I've heard others -- who weren't selling them,
AFAIK -- recommend them for the purpose.  YMMV, etc.

-- Ben
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Thomas Charron | 2 Sep 2009 01:30
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Re: Help connecting to two networks (Adding a virtual interface)

On Tue, Sep 1, 2009 at 1:02 PM, Greg Rundlett
(freephile)<greg@...> wrote:
> On Tue, Sep 1, 2009 at 12:00 PM, Ben Scott<dragonhawk@...> wrote:
>> On Tue, Sep 1, 2009 at 10:41 AM, Greg Rundlett
>> (freephile)<greg@...> wrote:
>>> Vlan tagging separates the traffic.
>>> How do I configure my notebook to be on both networks?
> I'm reading more on VLANs [1] and now have at least installed vconfig
> and enabled the 8021q kernel module [2] :-)
> This article [3] looks like what I'm after, so I'll have to study, and test

  Based on your initial example, did I read that right?  You want to
request 2 different DHCP based addresses from the same physical
network?

--

-- 
-- Thomas
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