Re: 802.11b access in Tokyo and Kyoto with IP mobility
I tried it as well, and was getting 80-100% packet loss to just about everywhere beyond the first-hop router. Not usable. --On Saturday, July 13, 2002 7:57 PM +0900 Fred Baker [EMAIL PROTECTED] wrote: For the record, I'm sitting at this instant in Tokyo Station, and am on my way from Narita to Yokohama. I am sitting in the green car, and I accessed the appropriate web page. I have wonderful 802.11 connectivity, and I have an IP address. Whether that means I can use the Internet is another question. On the parts of the track where the connectivity is there, we see ping round trip delays varying from 380 ms to over four seconds. There are fairly large parts of the track where the NTT DoCoMo 3G data connectivity appears to simply not be there - especially when in concrete tubes and ditches, but also on places with open track. So I think here the term seamless, when applied to connectivity, doesn't really apply.
Re: 802.11b access in Tokyo and Kyoto with IP mobility
For the record, I'm sitting at this instant in Tokyo Station, and am on my way from Narita to Yokohama. I am sitting in the green car, and I accessed the appropriate web page. So, was it worth the extra 2,340 yen? :-) We bought 2nd class tickets in car 7, but were still able to occasionally hear the 802 base station. By all accounts, though, the 3G connectivity wasn't great. Phil
Re: 802.11b access in Tokyo and Kyoto with IP mobility
crank your mtu size down. that frequently works in challenging rf environments. joelja On Sat, 13 Jul 2002, David R. Oran wrote: I tried it as well, and was getting 80-100% packet loss to just about everywhere beyond the first-hop router. Not usable. --On Saturday, July 13, 2002 7:57 PM +0900 Fred Baker [EMAIL PROTECTED] wrote: For the record, I'm sitting at this instant in Tokyo Station, and am on my way from Narita to Yokohama. I am sitting in the green car, and I accessed the appropriate web page. I have wonderful 802.11 connectivity, and I have an IP address. Whether that means I can use the Internet is another question. On the parts of the track where the connectivity is there, we see ping round trip delays varying from 380 ms to over four seconds. There are fairly large parts of the track where the NTT DoCoMo 3G data connectivity appears to simply not be there - especially when in concrete tubes and ditches, but also on places with open track. So I think here the term seamless, when applied to connectivity, doesn't really apply. -- -- Joel Jaeggli Academic User Services [EMAIL PROTECTED] --PGP Key Fingerprint: 1DE9 8FCA 51FB 4195 B42A 9C32 A30D 121E -- In Dr. Johnson's famous dictionary patriotism is defined as the last resort of the scoundrel. With all due respect to an enlightened but inferior lexicographer I beg to submit that it is the first. -- Ambrose Bierce, The Devil's Dictionary
Re: 802.11b access in Tokyo and Kyoto with IP mobility
At 07:43 AM 7/14/2002 +0859, Masataka Ohta wrote: it is a problem of a plain old telephone system so called 3G. the point is well taken, and is what we decided on the train as well.
Re: 802.11b access in Tokyo and Kyoto with IP mobility
For the record, I'm sitting at this instant in Tokyo Station, and am on my way from Narita to Yokohama. I am sitting in the green car, and I accessed the appropriate web page. I have wonderful 802.11 connectivity, and I have an IP address. Whether that means I can use the Internet is another question. On the parts of the track where the connectivity is there, we see ping round trip delays varying from 380 ms to over four seconds. There are fairly large parts of the track where the NTT DoCoMo 3G data connectivity appears to simply not be there - especially when in concrete tubes and ditches, but also on places with open track. So I think here the term seamless, when applied to connectivity, doesn't really apply.
Re: 802.11b access in Tokyo and Kyoto with IP mobility
In message [EMAIL PROTECTED], Fred Bake r writes: For the record, I'm sitting at this instant in Tokyo Station, and am on my way from Narita to Yokohama. I am sitting in the green car, and I accessed the appropriate web page. I have wonderful 802.11 connectivity, and I have an IP address. Whether that means I can use the Internet is another question. On the parts of the track where the connectivity is there, we see ping round trip delays varying from 380 ms to over four seconds. There are fairly large parts of the track where the NTT DoCoMo 3G data connectivity appears to simply not be there - especially when in concrete tubes and ditches, but also on places with open track. So I think here the term seamless, when applied to connectivity, doesn't really apply. No, not seamless, but I managed to download a lot of email on the train. --Steve Bellovin, http://www.research.att.com/~smb (me) http://www.wilyhacker.com (Firewalls book)
Re: 802.11b access in Tokyo and Kyoto with IP mobility
Fred; For the record, I'm sitting at this instant in Tokyo Station, and am on my way from Narita to Yokohama. I am sitting in the green car, and I accessed the appropriate web page. Note that that is an experimental service of JR, itojun mentioned, and has nothing to do with MIS service, I mentioned, subject line of which you copied. Anyway, I have wonderful 802.11 connectivity, and I have an IP address. Whether that means I can use the Internet is another question. On the parts of the track where the connectivity is there, we see ping round trip delays varying from 380 ms to over four seconds. There are fairly large parts of the track where the NTT DoCoMo 3G data connectivity appears to simply not be there - especially when in concrete tubes and ditches, but also on places with open track. As you know, JR uses not IP mobility but telephone network mobility. So, it is a problem of a plain old telephone system so called 3G. :-) So I think here the term seamless, when applied to connectivity, doesn't really apply. Direct WLAN service, today, has much less service area. However, in the future, inexpensive base stations of WLAN are essential to cover small holes of connectivity. Masataka Ohta
