I purchased an Odroid-XU4 for ca. 80 EUR including power-supply and case from Pollin. The original manufacturer is hardkernel. I intended to use this small ARM computer as a router and firewall. In the past I had used routers from multiple vendors, e.g., Linksys/Cisco, TP-Link, AVM/FritzBox, Netgear, and so on. There is a rule of thumb with all these devices: Usually you have to reboot them once or twice a month, otherwise they misbehave somehow. At least three of these device went completely catatonic. Now I had enough of this, I also wanted a command line interface to the router, ideally a real Linux system with
gcc, etc. Although I already own an Intel NUC and I am very happy with this computer, an Intel NUC is a little bit too expensive to be used as just a router.
I recommend to additionally purchase a RTC backup battery. The Odroid has a realtime clock, but looses all date and time information once powered off. This way the log of the computer is garbled.
Cablesurf is a German internet-cable-provider. They deliver Technicolor modem and set-top boxes to the end customers.
My cable modem model is:
HW Revision 1.0 VENDOR Technicolor
BOOT Revision 2.4.0 SW Revision STDD.01.05
MODEL TC7200.20 Software Version STDD.01.05
Serial Number 00997509604426
Mta Serial Number 00997509604426
Software Build and Revision
Firmware Name TC7200.20-DD.01.05-150924-F-1FF.bin
Firmware Build Time 11:45:59 Thu Sep 24 2015
Signal/Noise ratio for downstream is:
Channel Lock Modulation Channel Symbol Freq Power SNR
Status ID Rate
1 Locked QAM256 145 6952000 4.1 dBmV 40.3 dB
2 Locked QAM256 146 6952000 4.4 dBmV 40.4 dB
3 Locked QAM256 147 6952000 4.8 dBmV 40.8 dB
4 Locked QAM256 148 6952000 5.1 dBmV 40.8 dB
5 Locked QAM256 149 6952000 5.2 dBmV 40.8 dB
6 Locked QAM256 150 6952000 5.0 dBmV 40.8 dB
7 Locked QAM256 151 6952000 4.7 dBmV 39.9 dB
8 Locked QAM256 152 6952000 4.1 dBmV 40.3 dB
Signal/Noise ratio for upstream is:
Channel Lock Modulation Channel Symbol Freq Power
Status ID Rate
1 Locked QAM64 1 5120 Ksym/sec 45.5 dBmV
2 Locked QAM64 2 5120 Ksym/sec 47.0 dBmV
3 Locked QAM64 3 5120 Ksym/sec 47.0 dBmV
4 Locked QAM64 4 5120 Ksym/sec 47.5 dBmV
I ordered 120MBit/s, but speed according T-Online speedtest is as follows:
I attribute the drop from the bought speed to peering between Telekom and Cablesurf.
Checking my Unitymedia connection with T-Online speedtest gives:
This week I upgraded again, this time from 50 MBit/s to 100 MBit/s. My internet service provider is Unitymedia with whom I had positive experience since 2009, see Unitymedia experience. They phoned me mid of November and asked whether I would be interested in upgrading from 50 to 100, it would cost 2 euros more per month. I said yes. Here we go. I pay 35 euros per month for 100 MBit/s and a telephone flat rate within whole Germany.
Google CFO, Patrick Pichette, on the evolution of
- computing power
- storage capacity
- network bandwith
He shows the following remarkable slide on the disparity of the latter to the former. It was this disparity which apparently led Google to enter the broadband market with its own infrastructure.
This speech was held in Kansas, 2012. The full speech is in below YouTube video.
Although probably known in most circles it is worth repeating that
scp by itself does not honor symbolic links. To overcome this limitation just combine
tar on sending side, untar on receiving side:
tar cf - /src/dir | ssh remotehost "cd /dst/dir ; tar xf -"
Usually this is even faster than using
scp, as now only big chunks of data are transfered via TCP. Expect an almost twofold performance increase for larger directories which contain a couple of small files.
See also commandlinefu.
Bisher habe ich mit der Firma Unitymedia ausschließlich positive Erfahrungen gemacht. Sie sind es wert, kurz festgehalten zu werden.
Am 20. August 2009 habe ich bei Unitymedia Internet (20MBit/s) und Telefon bestellt. Am nächsten Tag stand ein Herr Niclas Roth von Computer-Füchse vor der Tür und hat Kabelmodem und Telefon eingerichtet. Alles lief auf Anhieb.
Anfang 2012 habe ich von 20 MBit/s auf 50MBit/s hochgerüstet. Unitymedia schickte mir das hierfür erforderliche neue Kabelmodem zu. Der Einsatz erfolgte klaglos.
Am 13. Juni 2013 fiel Internet und Telefon aus. Am nächsten Tag schickte Unitymedia einen Techniker, der das Problem behob.
Wenn ich an meine Erfahrungen zu ähnlichen Situationen mit der Telekom oder 1&1 denke, dann ist dies ein Unterschied wie Tag und Nacht.
For internet connection I use a cable modem EPC3208 from Cisco, which was supplied by the cable provider, Unitymedia in my case.
It shows the following measurements regarding signal-to-noise ratio, modem is at 192.168.100.1:
More information on this modem can be found here: Cisco EPC3208. According to Cisco modem the user and password credentials are admin/atlanta.