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I tried many variants to achive a satisfying access-line via ISDN (Euro-ISDN) by using the external
Terminal Adapter (TA) TAS400E from Askey. Unfortunately I never got a good line as with the same TA
under Windows 2000 or other Windows operating systems.
I could dial in with the TA using the set of AT commands as logged by the dial tool
under Windows 2000 ('ATB4' for Async PPP to Sync PPP conversion, 'ATP=6' for Euro-ISDN).
Thus I could establish a connection to my ISP, but it was incredibly slow. A research
with "ping" had this outcome:
Pings to a server using its IP-address ("ping aaa.bbb.ccc.ddd") produced a package loss of 0%. Pings to the same server
using its servername ("ping www.server.domain") showed a package loss of more than 90%. So it had to do something with
the accessibility of the name servers under Linux.
In the meantime I switched to ADSL (which I did not yet use under Linux). But a friend of mine, who
is one of the best available networking guys, suggested to me before that to investigate the problem by
setting various sizes of the MTU with the ping command. If the ping of a server using its servername would
work with a smaller MTU (e.g. 1420), then one would have to set this MTU in the ppp-module.
If this was useful, then please drop a note in
my guestbook.
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