Thanks to all who responded.
The main suggest is:
Check the sun patch list , sun has released several patches to deal with
ip problems over slow dial up connections.
I found next patches on ftp://sunsolve1.sun.com/pub/patches
103169-06: SunOS 5.5: ip driver and ifconfig fixed
103447-06: SunOS 5.5: tcp patch
-- Andrey A Perminov e-mail: email@example.com System Administrator Moscow State University of Forestry (Russia)
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