@RealBlackStuff: Won't hurt to check, but he is not getting disconnected per say, he can still ping stuff after what appears to be a disconnect. Look at that last ping time below though... 1419ms! something wierd happening.
after 1st trial and timeout
reponse de 22.214.171.124:octet=32 :temps=281,262,297,252 (for each line)ms: TTL=52
Reply from 126.96.36.199: bytes=32 time=281ms TTL=52
Reply from 188.8.131.52: bytes=32 time=262ms TTL=52
Reply from 184.108.40.206: bytes=32 time=297ms TTL=52
Reply from 220.127.116.11: bytes=32 time=252ms TTL=52
This actually looks better then the working set of pings below.
after connecting the modem at 1st reboot
reponse de 18.104.22.168:octet=32: temps=291,279,280,1419ms (for each line):TTL=52
Reply from 22.214.171.124: bytes=32 time=291ms TTL=52
Reply from 126.96.36.199: bytes=32 time=279ms TTL=52
Reply from 188.8.131.52: bytes=32 time=280ms TTL=52
Reply from 184.108.40.206: bytes=32 time=1419ms TTL=52
This last line is the wierd part, all the ping times are rather high, but 1419ms(1.4 seconds) is WAY high. The modem is still connected, but something is definately awry. I would like to see a ping line to the same address from your working machine to see if the 280-300ms is normal for you. (mine were in the 40 range a few days ago, today they are around 100ms, so 280 from your location is not unimaginable)
How can you say it's time to change the drivers? I've found that the modem was thinkpad3.36 data fax vod and the drivers was comm.drv
Yea, my bad, it is indeed a "MDSP2780 MWave DSP 33.6Kbps" but 28.6k is still pretty good. comm.drv is the com port driver built into windows.
My Thinkpad 760XD has the exact same modem in it, the drivers are Version 2.25a
part of the readme.txt:
The following ThinkPad models are supported.
- ThinkPad 755CD, 755CDV, 755CE, 755CSE, 755CV and 755CX
- ThinkPad 760C, 760CD, 760E, 760ED, [b]760XD[/b] and [b]765D[/b]
- (New) Windows 98 Support.
- (New) 33.6K bps Modem speed (V.34) support.
So, this driver should be at 2.25a for 98, you also need to make sure you have msdun14.exe installed.
Also, when the modem is messing up, try going to http://220.127.116.11/
This will bypass the DNS server and try to connect directly to google.
I would also like you to try several pings after is messes up, to see if that 1419 line was a fluke.
As far as the drivers, I was referring mainly to reinstalling the TCP/IP stack drivers, but this requires the windows 98 cab files. Did yo look for those on your hard disk?