Mobile Broadband Dongle
Yufei Labbe
Alternatively you can click Edit Connections..., then click the Add button in the Network Connections menu and select Mobile Broadband as the Connection Type, which will then also bring up the wizard shown below.
Rumor has it that this works for some devices and has to be performed only once when the device is completely new and hasn't been used before. This is only needed to change the mode of the dongle. (See explanation about usb-modeswitch below.)
If you don't get the window shown in step 1, then it might be that the SIM card is blocked (see paragraph above), not properly inserted (e.g. upside down) or the dongle itself is not detected due to usb-modeswitch issues.
The thing with USB modes on these devices is, to first present the dongle as a read only storage device with an (outdated) driver that you could install and then change the mode so that the device can be used as it was intended. However you almost never need to install these drivers. The situation in most cases is, that Linux already has a driver, but somehow cannot activate the mobile broadband modem part of the dongle.
You should also find out which dongle you have (as you can see in the example it's not always quite obvious and the lsusb output may also not be accurate), search for it online and provide maker and model name along with to Ubuntu version you are using when you ask a new question, thus helping everyone finding questions already asked and corresponding answers.
I don't see a point in getting a second device just to connect to a laptop. My G1 (with Cyanogen's rom) tethers quite nicely with USB, bluetooth and wifi. The extra latency and power consumption are outweighed by the ridiculous prices of data only plans here in the United States. I can obtain fairly good download speeds on T-mobile's HSPA network.
From my experience speed is way faster using a USB dongle than accessing by tethering a phone. Better dongle also works faster. After trying a few dongles I am now settling on sierra 312U. I manage to get 18Mbps on a plan that specified 21Mbps max.
I've been using Ubuntu for a while now and wanted to switch to Mint. I connected my mobile broadband dongle (Vodafone) for the first time like in Ubuntu it all went fine but subsequent connections were denied. I tried connecting with other network dongles and they could connect me to the Internet. My main dongle with the most stable internet connection is Vodafone.
When you're in coverage and connected to our network, a Mobile Wi-Fi router will create a portable hotspot that can be used to connect multiple devices. But if you need Home Broadband, then visit our Home Broadband page where you can choose a 4G or 5G Broadband plan.
Mobile Broadband helps you stay connected when you're on the move. You don't have to worry about finding a Wi-Fi network, you just need mobile signal and network coverage. It's perfect when you're travelling, working or don't have access to Home Broadband.
Get online using a data SIM and set up your own wireless hotspot using a Mobile Wi-Fi router. These internet dongles can connect multiple devices, so they're great for getting friends and colleagues online.
Mobile Broadband uses a data SIM, similar to those used in mobile phones. Get online using one of our Mobile Broadband deals.
Tablets usually have a slot where you can insert a data SIM or you can use a Mobile Wi-Fi or MiFi router. MiFi uses a data SIM to share a Mobile Broadband connection. It's ideal if you want to connect multiple devices when you're on the move. It's just like your very own, pocket-sized internet dongle.
You will need to have your mobile number of your mobile broadband which will have been provided by the retail agent in the Vodafone store you bought your device in. If you bought your device online you will have received an email to the email address provided at point of sale which contains your mobile number.
If you do not know your mobile broadband number, you can call or go back to the Vodafone Retail store, use live chat on vodafone.ie or contact 1741 and speak to an operator. They will need the SIM number which you can find on the SIM card within your mobile broadband device.
You can change your mobile broadband top up plan by registering for MyVodafone on Vodafone.ie with your mobile number or email address registered when buying your mobile broadband device. The token will be sent out to your email address only if you gave your email at point of sale and changed your notification preferences to email.
Can a 3g mobile broadband stick route the 1500 byte packets arriving from
the LAN without fragmentation, or should I reduce the size of the MTU for
outbound traffic? If so, what should I reduce it to? (My internet service
provider is Three Mobile, if that matters.)My next question is ...Will Linux allow me to configure two MTU sizes on a single network interface,
depending on whether or not the destination address is local or remote?If I need to reduce the MTU for outbound traffic, can I keep using a 1500
byte MTU for LAN traffic?(The computers have only one ethernet connection onto a single subnet. There
is a single ethernet based router (Netgear) before the Edimax unit, which
forwards internet bound traffic via the Edimax unit).Mark.--
Mark Hobley
Linux User: #370818
No, but you can manually introduce PMTU routes up in your routing
table to accomplish that task.rick jones
--
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where do you want to be today?
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feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
> Mark Hobley wrote:
>>My LAN is ethernet based. However, for connectivity to the internet, I have
>>an Edimax 3g-6200n router, which connects to the internet via a 3g mobile
>>broadband stick.
>>
>>Can a 3g mobile broadband stick route the 1500 byte packets arriving from
>>the LAN without fragmentation, or should I reduce the size of the MTU for
>>outbound traffic? If so, what should I reduce it to? (My internet service
>>provider is Three Mobile, if that matters.)
>
> You expect us to answer this? You are sitting on the network. Fire
> up wireshark, or even tcpdump, and send som max-sized ping packets
> to somewhere, and then you can tell us.Yeah.I can add that there's most likely at least one bottleneck: at one
point your packets go over GTP over UDP over IP, on Ethernet.
*Someone* will get hurt if you use 1500-octet packets -- possibly the
operator.
>>My next question is ...
>>
>>Will Linux allow me to configure two MTU sizes on a single network interface,
>>depending on whether or not the destination address is local or remote?
>>
>>If I need to reduce the MTU for outbound traffic, can I keep using a 1500
>>byte MTU for LAN traffic?
>
> No. You can use a setsocopt to set tcp segment sizes on sockets. I would
> like to see this as a sysctl variable. One mtu for all. The linux box
> will ACCEPT bigger muts though.You've mentioned this several times recently. What about PMTU
discovery -- doesn't that work for you? It seems to work well enough
(or never kick in) for me./Jorgen--
// Jorgen Grahn O o .
Don't know, but if it works OK for all sites then I guess so.That's a bit oversimplistic because I have no idea about 3G devices, eg.
they may be doing some mss clamping that reduces the size of packets in
tcp connections.Tcpdump/wireshark etc will show this - but don't just rely on looking at
one connection as you may be just seeing how they have set things up
rather than learning about your ISP.I have seen threads where people claim better results by using smaller
MTU due to smaller packets having more chance of getting through rf
noise type loss, so experimenting if you have problems could improve
things - if you don't have problems I wouldn't bother.
>
> My next question is ...
>
> Will Linux allow me to configure two MTU sizes on a single network interface,
> depending on whether or not the destination address is local or remote?
>
> If I need to reduce the MTU for outbound traffic, can I keep using a 1500
> byte MTU for LAN traffic?
>
> (The computers have only one ethernet connection onto a single subnet. There
> is a single ethernet based router (Netgear) before the Edimax unit, which
> forwards internet bound traffic via the Edimax unit).
A quick test I just did using ip route shows it is possible to just
modify the default route, which I assume is all you would need.Normally if you set mtu on eth then the tcp advertised mss will also
adjust so that incoming tcp packets are also limited in size. Using ip
route this doesn't happen, but you can use an extra commant to specify.Testing on this PC which already has a default route setup to
192.168.0.1, the command -ip route change dev eth0 default via 192.168.0.1 mtu 1000 advmss 960seems to do the trick and leaves traffic to local net unchanged.
They shouldn't get hurt if they know what they are doing - most recent
ISP type kit should be able to run MTU > 1500 to handle this.In the UK alot of ISPs use the dominant teleco for transport and they
use L2TP - and explicitly state in the specs that the ISP must run a
higher MTU to allow for this.
Does your ISP restrict your inbound to < 1500, though. If it doesn't you
are not likely to have problems.In the case of pppoe type ISPs the 1492 they (may) run is overcome by
the fact that consumer dsl modem/routers mss clamp TCP avoids PMTUD
black hole faliures.
True, the reply coming-back fragmented means either the remote, or the
ISP(s) in the middle had a smaller-than-echo-size MTU. However, if
the reply comes-back unfragmented we know that both the remote and
ISP(s) in the middle had an MTU of at least that size.rick jones
--
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