many wifis don't like vpns and choke on them, made that experience too. #freifunk too, so it seems like some configuration thing. thanks for the hint, i'll try next time.
I read some article where the DB actually said: "Please use a VPN to secure your connection..." xD Furthermore, WTF, they only use 2.4 GHz Network in their trains?!
Sadly I forgot to log at my wifi log, to see if they are doing some client steering or modifications to handle this enormous traffic.
One the other side a VPN is bad, because they could so something like Cashing Websites or stuff like this, to reduce latency and bandwidth the the cellular connection. But often Caches are evil... :/ I don't know... They should just get some contract with Netflix for deploying some "Netflix CDN Node" (yeah, wtf, netflix is his own CDN!!! xD) directly in the train... 😁 So you have no trouble just watching your series...
The ICE's actually do have a local cache of TV series, movies and audiobooks available through on-board WiFi, it's just not Netfilx but some other network (IIRC Maxdome, but I may be wrong here). Depending on VPN configuration they would even be available while the VPN tunnel is connected.
Furthermore the trains wouldn't have enough space to actually store the complete Netflix repository, so no way to cache that on-board.
The main use of 5GHz WiFi is in apartment and office complexes where each and every single apartment runs its own WiFi and thus the 2.4GHz spectrum is full of conflicting networks, each being encrypted differently and probably even on adjacent channels causing interferences and thus reducing signal quality for everyone. 5GHz doesn't penetrate floors and ceilings and has a generally reduced signal range, thus providing enough spectrum space for everyone. On a train coach with a single unencrypted WiFi system, this problem simply doesn't exist, so 5GHz would just cost extra in radios, antennas, electronics and power consumption while... mehr anzeigen
The ICE's actually do have a local cache of TV series, movies and audiobooks available through on-board WiFi, it's just not Netfilx but some other network (IIRC Maxdome, but I may be wrong here). Depending on VPN configuration they would even be available while the VPN tunnel is connected.
Furthermore the trains wouldn't have enough space to actually store the complete Netflix repository, so no way to cache that on-board.
The main use of 5GHz WiFi is in apartment and office complexes where each and every single apartment runs its own WiFi and thus the 2.4GHz spectrum is full of conflicting networks, each being encrypted differently and probably even on adjacent channels causing interferences and thus reducing signal quality for everyone. 5GHz doesn't penetrate floors and ceilings and has a generally reduced signal range, thus providing enough spectrum space for everyone. On a train coach with a single unencrypted WiFi system, this problem simply doesn't exist, so 5GHz would just cost extra in radios, antennas, electronics and power consumption while not every device could use it, so it just isn't there.
And of course they are asking people to secure their connections. Implementing a per-user WiFi encryption costs money in configuration, electronics and power consumption - there are a couple of hundred if not thousand coaches online throughout the day, which is about 19 of 24 hours, if not more, someone has to pay for all of this. But, regardless of encryption on the WiFi in use, the connection would have to pass the cellular network, which may or may not be encrypted and no passenger-user would be able to actually make sure there is cellular encryption. So why not tell people to do it themselves and properly? (Okay, OTOH it's interesting how many people are doing business-things on their laptops without even the 3€-precaution of an optical privacy filter...)
Wrt. caching websites - with the proliferation of Let's Encrypt most websites do at least offer a secured connection which in turn means a caching proxy is actually useless because the proxy is unable to actually see the contents to be cached - so no use for that anyway, why spend the money?
2.4 GHz can only have up to 40 MHz Bandwidth and then only 2 non overlapping Cells... Common use is 20 MHz with 3 non overlapping cells. A good Signal strength ist Importamt ( but a good Signal strength can cause Hidden Station Problem) For high Modulation technique. But If u Stream a Video in a 2.4 GHz network the Channel utilization rises enormous. In 5 GHz You can use vht. Fuethermore WiFi Situation becomes even worse due to perfomance Anomaly.
(Interesting topic, i will write something when i'm logged into a WiFi with my laptop ^^)
Why bother about overlapping cells? On an ICE there are only two points per coach where cells actually might overlap: at the junctions, so there's no worry about overlap here anyway. Furthermore, signal strength is also not that important as there is practically no radio obstruction between passenger equipment and AP in the roof of the coach (except luggage maybe, but that is rarely severe).
You are probably right about the impact of streaming video to passenger equipment and its impact on overall performance with b/g/n networks, but then, from looking around, it seems not many passengers are actually streaming videos but are rather watching "canned" films.
Regardless of the aforementioned my observation is that I can get a steady and not severly impacted bunch of SSH sessions over OpenVPN (admittedly MTU 1400 hard coded on the VPN server endpoint) on an ICE, so can't be that bad. 😉
Nick
Just set mtu size different... 😁
herzmeister der welten
herzmeister der welten
Felix Tiede
Nick
Furthermore, WTF, they only use 2.4 GHz Network in their trains?!
Sadly I forgot to log at my wifi log, to see if they are doing some client steering or modifications to handle this enormous traffic.
One the other side a VPN is bad, because they could so something like Cashing Websites or stuff like this, to reduce latency and bandwidth the the cellular connection. But often Caches are evil... :/
I don't know... They should just get some contract with Netflix for deploying some "Netflix CDN Node" (yeah, wtf, netflix is his own CDN!!! xD) directly in the train... 😁 So you have no trouble just watching your series...
Felix Tiede
Furthermore the trains wouldn't have enough space to actually store the complete Netflix repository, so no way to cache that on-board.
The main use of 5GHz WiFi is in apartment and office complexes where each and every single apartment runs its own WiFi and thus the 2.4GHz spectrum is full of conflicting networks, each being encrypted differently and probably even on adjacent channels causing interferences and thus reducing signal quality for everyone. 5GHz doesn't penetrate floors and ceilings and has a generally reduced signal range, thus providing enough spectrum space for everyone.
On a train coach with a single unencrypted WiFi system, this problem simply doesn't exist, so 5GHz would just cost extra in radios, antennas, electronics and power consumption while... mehr anzeigen
Furthermore the trains wouldn't have enough space to actually store the complete Netflix repository, so no way to cache that on-board.
The main use of 5GHz WiFi is in apartment and office complexes where each and every single apartment runs its own WiFi and thus the 2.4GHz spectrum is full of conflicting networks, each being encrypted differently and probably even on adjacent channels causing interferences and thus reducing signal quality for everyone. 5GHz doesn't penetrate floors and ceilings and has a generally reduced signal range, thus providing enough spectrum space for everyone.
On a train coach with a single unencrypted WiFi system, this problem simply doesn't exist, so 5GHz would just cost extra in radios, antennas, electronics and power consumption while not every device could use it, so it just isn't there.
And of course they are asking people to secure their connections. Implementing a per-user WiFi encryption costs money in configuration, electronics and power consumption - there are a couple of hundred if not thousand coaches online throughout the day, which is about 19 of 24 hours, if not more, someone has to pay for all of this.
But, regardless of encryption on the WiFi in use, the connection would have to pass the cellular network, which may or may not be encrypted and no passenger-user would be able to actually make sure there is cellular encryption. So why not tell people to do it themselves and properly?
(Okay, OTOH it's interesting how many people are doing business-things on their laptops without even the 3€-precaution of an optical privacy filter...)
Wrt. caching websites - with the proliferation of Let's Encrypt most websites do at least offer a secured connection which in turn means a caching proxy is actually useless because the proxy is unable to actually see the contents to be cached - so no use for that anyway, why spend the money?
Nick
A good Signal strength ist Importamt ( but a good Signal strength can cause Hidden Station Problem) For high Modulation technique.
But If u Stream a Video in a 2.4 GHz network the Channel utilization rises enormous. In 5 GHz You can use vht. Fuethermore WiFi Situation becomes even worse due to perfomance Anomaly.
(Interesting topic, i will write something when i'm logged into a WiFi with my laptop ^^)
Felix Tiede
Furthermore, signal strength is also not that important as there is practically no radio obstruction between passenger equipment and AP in the roof of the coach (except luggage maybe, but that is rarely severe).
You are probably right about the impact of streaming video to passenger equipment and its impact on overall performance with b/g/n networks, but then, from looking around, it seems not many passengers are actually streaming videos but are rather watching "canned" films.
Regardless of the aforementioned my observation is that I can get a steady and not severly impacted bunch of SSH sessions over OpenVPN (admittedly MTU 1400 hard coded on the VPN server endpoint) on an ICE, so can't be that bad. 😉