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Prasert
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Posts posted by Prasert
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The usual headache: bridges, accesspoints, routers.
The magic word: OSI model.
Layer 1
This consists of the physical network - in this case the utp wiring for the LAN part and the radio signals for the WiFi part. There's 4 non-overlapping bands in the 2.4GHz range: if you configure channels 1, 5, 9 and 13 on 4 nearby accesspoints, these will not interfere with eachother.
Layer 2
This layer has nothing to do with TCP/IP yet. It's the layer where MAC addresses play a role. An accesspoint works as a bridge on this layer: it bridges traffic between the wired and non-wired physical networks. To perform this function, it only needs to know which MAC addresses are on both physical networks and it'll keep track of these addresses in a table.
Layer 3
This is where the IP protocol starts. All physical networks that are bridged together at layer-2 are seen as 1 network on layer-3. This means that all devices on this network will have an IP address from the same range, and they will all be able to ping each other.
An accesspoint has an IP address, but that's only for the purpose of configuring/managing the accesspoint. It's IP address does not play any role in it's basic function: bridging between the wired and wireless network.
In the setup of the OP there's a network consisting of 2 accesspoints and a router which connects this network to the internet. The easiest setup is to make this one single layer-3 network:
Use the network 192.168.0.0/24 (/24 means the subnet mask is 255.255.255.0)
Give the router address 192.168.0.1
Give accesspoint1 address 192.168.0.2 and set it to channel 5
Give accesspoint2 address 192.168.0.3 and set it to channel 9
Configure the same SSID on both accesspoints; any device will automatically select the strongest signal.
If you're using a wireless router as an accesspoint: use one of the LAN ports to connect it and leave the WAN port unconnected. Only configure an IP address, subnet mask and default gateway.
Configure only one dhcp service, e.g. on the router that connects to the internet.
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A littlebit off-topic, but very essential and one of the main reasons why people don't get networks up and running:
Bridging and routing perform similar tasks however routers are more efficient and common than bridges.
Similar tasks? Well, if you talk about networks in general, then yes, they both are part of a network.
But in this case, there is a huge difference.
Bridging is OSI layer 2, devices that work on OSI layer 2 are switches and accesspoints (and a DSL modem in bridge mode). A bridge is basically a device that sends packets from 1 interface to the other, only changing the layer-1 information.
A bridge is unaware of the protocol being used, eg. TCP/IP or IPX.
Routing is OSI layer 3. This is where IP addresses appear.
A wireless router consists of a bridge between the ethernet LAN ports and the WiFi interface (SOHO routers are not able to route between these 2 physically different networks), and a router between that bridge and the WAN port. That WAN port can be another ethernet port or dsl port.
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The DM800 Wikipedia I wrote for the Pli software will help with all the basic things like pvr/ streaming etc (although there should be a HDD/PVR kit in the box that came with the DM800 and instructions in the manual about how to add the HDD) but will not help the CCcam issues as that is already covered in the sample config files in the Pli software as it should be with Gemini one would think.
There's one little detail you can add to the streaming instructions: set the TTL value higher than 1 if you want the multicast to reach other networks.
How does the DM800 stream the video, in mpeg2 or mpeg4?
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As CNN said.....
....instead of driving the moderator to alcohol abuseDo we???
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Oh yeah the location. We're in Bangkok. Saphan Khwai area on Pradipat.
Possible someone could do this without coming in the office I supposes, not sure if we'd set up a VPN or just send the configuration info and do the things they tell us. But I assume it's better for someone to come in and be hands on.
Thanks.
I'm here. What are your other 2 wishes?
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Move you dish a little bit to the south and a little bit up. You can use www.dishpointer.com to see the exact alignment for your location. Once you have found the Thaicom5 satellite, slightly turn the LNB to get better reception.
Thaicom5 covers entire Thailand, so you will have reception.
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Twisted pair is better than no-twisted.
The big black aerial cables that have 12/24/48 or more pairs inside are all twisted pairs. Each pair has a different number of twists-per-distance to reduce crosstalk. When you strip the insulation of UTP cable, you can see that the 4 pairs each have a different number of twists.
About the length - I think it's a matter of centimeters per 100m, not really interesting.
The diameter of the copper used also makes a difference. Generally 2 flavors are available here ibn Thailand: 0.4mm and 0.9mm. On shorter distances (up to 500m), the 0.4mm has better signal quality, for longer distances 0.9mm has the best results.
Check the Wiki page for details.
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Supernova has posted some links to good theoretical information about ADSL. However, the situation here in Thailand has a few extra headaches:
Practically all telephone lines run 6m above the ground, and so do the 220V power lines.
Thai electric installations usually lack grounding and the use of a GFCI, a Ground Fault Circuit Interrupter. In many places wiring is so bad in houses/shops/etc. that current is leaking away and this causes a magnetic field around a power line (this field would trigger the GFCI, indicating you have a wiring problem!).
Add all these poor installations up, and the result is a big magnetic interfering field along the poles, where the phone lines are running as well.
TOT phone lines are usually 2 non-twisted copper lines and a steel cable for strength/support (8-figure dropline). CAT uses a twisted copper pair with a steel cable, which performs better and is a little bit less susceptible to interference.
And rain is also influencing the signal quality. Even perfectly insulated phone lines are affected during rain, as the magnetic interference changes dramatically due to bad insulation of power lines.
The only cabling not affected by this, is fiber. But it's still a hel_l of a lot more expensive than copper.
Another option would be to put the cable into the ground, but Thai land laws make this basically impossible.
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About the signal-noise ratio:
With ADSL version 1 (G.DMT) you need a SNR of 10dB or higher. This number applies to 512k/2M lines. But when speeds go up, the SNR drops. A 1M/8M line (which is the maximum for ADSL version 1) can have a SNR of 11dB down and 5.5dB up, still stable and performing fine.
With ADSL2 and ADSL2+ this SNR story changes. SNR values can be much lower, as more bandwidth on the copper line is used (in smaller frequency bands).
Example on a 3km line:
downstream/upstream: 10M/2M SNR: 13.5dB/12.3dB
downstream/upstream: 15M/2.4M SNR: 6.1dB/7.7dB
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Is it possible to find out what encryption they are using? I'm sure some wag will find it if there is a way... It does seem strange that they have left 3 channels open. Don't want to raise hopes but if they are closing the Sat down why hav'nt they done it? It's a puzzle... maybe someone has an explanation..
The encryption is still the same, but obviously with an extra gimmick. It looks like the same trick Telkomvision is using.
DStv stated earlier that the signal would remain available for Asian cable tv providers. Since SuperSport has vanished from all Thai cable tv companies, one can conclude that they were pirating the signals.
SS 5 and SS 6 are back now, also.
Hopefully these channels will remain open, with a bit of luck I can watch the world championship on SS5 this sunday! -
Hi,
The rainfade problem is more pronounced in Thailand due to the low angle of the satellite. In most other countries the line of sight to satellite is a lot closer to vertical, but due to the vast array of Thaicom's other cutomers, the satellite is not positioned over Thailand but at some other more economical point. This means that the signal has a much longer path to travel en route to your dish and is hence more prone to rainfade, trees, birds and other things which may block the signal path.
Is that so? Thaicom2/5 is 36409km above my house, at a 62.5 degree angle.
Compare that to watching the Astra satellite from Amsterdam: 38825km and 27.7 degree angle.
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I'm still receiving a signal from DStv. Although the screen doesn't show a picture, the decoding is fine, the receiver is showing the EPG information for all channels.
Right now (still) working with sound+video:
SuperSport 1
SuperSport 3
History Channel
So it looks like the channels are still there, just the encryption has been changed. Looks like the same trick done by Telkomvision.
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You don't even have to understand Thai to listen to the Thai commentary. 90% of the commentary consists of khap, na khap and oi.
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Usenet is simply too complicated for the majority of internet users. Anything that goes beyond the webbrowser takes too much effort in understanding.
The internet became popular with the webbrowser, more or less the successor of the gopher application. It was graphical and allowed operation with a mouse. This made the interesting for the bigger audience.
So development of the internet focused mainly on websites. The html language was developped, Javascript was introduced and websites started to replace functionality that used to be available through other programs.
An example of a non-webbased application these days is bittorrent. The same questions about portforwarding pop up everytime, while the user refuses to learn about ports, sessions and NAT.
If one can't simply click with a mouse, it's too difficult. And usenet belongs in many ways to this categorie....
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Port forwarding is done at the same place where NAT occurs: between private and public IP addresses.
On CAT CDMA, setting up a session to a public CDMA client's IP address is prohibited.
If you have a CDMA connection straight on your computer, you probably have a public IP address. NAT nor Portforwarding is an issue here. If your torrent client shows no incoming connections, then it's because sessions from the internet to your computer are not allowed by the CAT firewall.
Another misconception:
properly forwarding the port(s) used by your bittorrent client will not speed up downloads.
It will just speed up session establishment.
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Do a manual scan for frequencies 3836 and 3863
Change the symbol rate to 22500
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The technology of Linksys is still the same. Cisco bought Linksys to have a part of the end-consumer market. Linksys hitchhikes along on the Cisco brand name.
But that's all there is to it. Technology and development are still different, and of course so is pricing.
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Can you elaborate a bit on that "no rocket science"? Is it just adding an ip etc. in the 8 mount options?
thanks,
harry
After reading several other topics in this forum, I take this remark back.
Yes, linux without a mouse is rocket science for the majority.
All versions in Linux use the same basic paths for binaries and configuration files (Ubuntu being an exception in this). A dreambox is not that much different from an ordinary linux machine, it's just stripped down to perform those tasks needed.
Telnet, ftp, the vi editor and a few very basic unix commands enable you to configure a Dreambox within 30 seconds. But....using the command-line interface is by now a relic from the previous century. Only very few people understand what's under the hood of their desktop.
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TOT's explanation: this measure is taken to prevent spam.
Real explanation:
Blocking port 25 to any server except your own mailserver, forces (more or less) people to use that mailserver.
Once all outgoing email is going through this system, it's very easy to configure this machine to save a copy of each mail to disk. This way it's possible for the ISP to read every single email.
Since this might become an massive task, the government could use scanning and filtering software to scan each email for specific keywords, followed by a decision to forward it or to trash it.
If the Thai government is indeed censoring email this way, circumventing it by using SSL connections cannot be discussed here.... ouch
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Most of those dishes are rusty, specifically the bracket and the lowest part of the arm holding the LNB.
A new Ku-band dish is 850 baht. Why bother with the old UBC dish (unless it's rust-free)?
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The Thaivisa website itself is very fast. If one filters out all advertisements coming from 3rd-party websites the pages load instantly (even with TOT).
When any of those 3rd-party servers cause the a delay, the whole page loads slow.
@TV: Maybe an idea to put all advertisement links at the end of each html page, using css to position it in the right place? Any advertisement delays at least won't fail a page from loading.
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The end of C-band transmission has now also been confirmed on the DStv forum by a number of DStv employees.
....bugger.... There is also another remark: DStv will continue to service the Cable providers in Asia. So how are they going to do that? C-band transmission with a different encryption? Cards will be paired to the decoders, which can't be done with the current system. I'm not surprised if just the encryption changes, and new decryption cards + STBs are only provided to legal subscribers in Asia. Which would be legal Cable TV Providers - might be interesting to see how many cable tv channels in Thailand will remain black in June.
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HNK is available on 12657 H (TrueVisions) and 12355 V (which won't decode with a TrueVisions smartcard)
CNN is available on 12604 H (TrueVisions) and 12355 V (which won't decode with a TrueVisions smartcard)
If you get 38% SNR, then there is something wrong. When the SNR hovers around 60% it means the LNB is working ok, but not picking up any signal.
It might be the LNB. Set the threshold to 11700 and see if it makes a difference.
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93 BBC BBC World News Not listed on Dreambox
82 MA Majung Not listed on Dreambox
85 MTV MTV Not listed on Dreambox
92 PHOX PhoenixInfoNews Not listed onDreambox
83 LTNG TChannel Not listed on Dreambox
81 TMUS TrueMusic Not listed on Dreambox
These channels are on 12604 H - SR 30000 - FEC 2/3
Go to the satfinder and select 12604H. The SNR should be above 80%
If you can't get a lock on this transponder, check if the dish is properly aligned.
91 CNN CNNInternational Listed on Dreambox but does not play97 NHK NHK Listed on Dreambox but does not play
Make sure that you select these channels from True. There's other providers on the same satellite that provide these channels (in this case on frequency 12355 V. They won't decrypt with a truevisions smartcard.
More information about frequencies:
Thaicom5: http://www.lyngsat.com/thai5.html
Thaicom5 TrueVisions: http://www.lyngsat.com/packages/truevisions.html
Hopefully these channels will remain open, with a bit of luck I can watch the world championship on SS5 this sunday!
Help - Network Issue Driving Me Nuts....
in IT and Computers
Posted
If you configure channel 1, you're also using channels 2-4. The entire bandwidth used for a wifi connection spans 4 channels. So at least configure the ranges on your own accesspoints non-overlapping. Channels 5 and 9 are the best choice, since all WiFi antennas are constructed for the middle of the frequency band (channel 7)
Of course you can choose any subnet. 192.168.1.0/24 is ok as well. But it's more important that you understand what a subnetmask actually means.
This has to do with the subnetmasks you mentioned earlier. 255.255.255.0 indicates a network with 254 hosts. Subnetmask 255.255.0.0 indicates a network with 65534 hosts!
If not all devices use exactly the same mask, strange things can happen.
Stick to the setup I described, and yes, you can change 192.168.0.x to 192.168.1.x, as long as you are consequent in changing it everywhere. Even more important: understand what you are changing and why.