Questions[3g](server)

I want to connect a RPI to the internet via an UMTS stick. I could get it working with some manual interaction. As the RPI is place on an external location where i don't have access to all the time, it should completely "come up" automatically when its booted.

What is did:

sudo apt-get install wvdial ppp sg3-utils

set /etc/wvdial.conf to:

[Dialer Defaults]
Init1 = ATZ

; Huawei E182E:
;Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0

; Huawei E173
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2

Init3 = AT+CGDCONT=1,"IP","web.vodafone.de"
;Modem Type = Analog Modem
Modem Type = USB Modem
ISDN = 0
New PPPD = yes
Username = ''
Password = ''
Modem = /dev/ttyUSB0
;Modem = /dev/bus/usb/001/011
Dial Command = ATD
Stupid Mode = 1
Phone = *99#
Baud = 115200
Auto Reconnect = on

set /etc/ppp/peers/wvdial to (no idea if this is required and what this does?):

noauth
local
name wvdial
usepeerdns

created /etc/network/interfaces.d/ppp0 (i have the impression that this does nothing as it does not "up" the interface at boot and the route is not set)

auto ppp0
iface ppp0 inet wvdial
up ip route add default dev ppp0

as the above interface configuration does not activate the interface at boot, i added this to /etc/rc.local-> wvdial&

When i (re-)boot the RPI after all these settings, the interface is properly activated but my traffic is not routed to the UMTS interface. When i execute ip route add default dev ppp0, everything works like it should be and the UTMS interface (ppp0) is used for internet traffic.

How can i automatically add this default route when the device is booted? or maybe better, when the ppp0 interface is connected?

We host a site with a 2900 series router with 3x 3G-HWIC cards installed.

It is hosted with telstra and plugs into our corporate WAN.

The card authenticates against radius and advertises a route into the WAN for which subnet it routes for.

We have always used the same advertised subnet on each.

Telstra have advised us that this could be the cause of some drop out issues whereby some services will work for some people and not for others and are saying effectively that their system will only use one of these at a time even though we can see the interface is online and assigned a WAN IP address.

Has anyone out there configured a multi HWIC setup before and if so are they using different subnets for each or the same?

I have an internet connected Ubuntu server, connected by Ethernet to a residential ADSL line. This is adequate, most of the time, but I can't rely upon the ADSL link to be as reliable as I'd like. Murphy's law has already dictated that down-time comes when it is least convenient.

I'd like to use a 'pay-as-you-go' 3G USB dongle to provide a fail-over. I'm lacking information both about sample configurations that work for other people - and about the most suitable (inexpensive) hardware for my purposes. The objective is that, when my ADSL line is disconnected, the server detects this and dials up the 3G service - monitoring the ADSL line and switching back seamlessly when its connection is restored.

The principle service I care about is an OpenVPN tunnel - over UDP to a remote server. The other useful service would be Squid - so I'd still have web-access from my LAN when ADSL is disconnected.

Questions:

1. How difficult would this be to set up?
2. Would I be forced to 'roll my own' - or are there packages/howtos I've overlooked?
3. What (inexpensive) hardware is recommended (concerned with unattended reliability - mainly)?
4. Any anecdotes of success or failure from others who've tackled this already?

Just wondering if 3G networks can be sniffed like public wifi networks, via wireshark for example (I'm almost sure this is not possible due to encryption, but I just want to make sure?)

I'm in charge of managing an array of Windows Embedded 7 Standard based PCs (they act just like plain old Windows 7).

The computers have 3G cards as their only means of communication, and are on buses. Right now, the 3G cards are configured in NDIS mode which in theory will maintain the connection automatically and persistently. However, sometimes the 3G link fails and never comes back up.

Can someone help me out here? My basic requirements are

• Internet is available always
• If the connection fails, it is detected and retried

Is RAS/DUN more reliable for this sort of thing than NDIS?