Проблема WIN95 -> PAP -> dial-in linux

Настраиваю dial-in на rh7.2. Использую mgetty+AutoPPP+pppd 2.4.1
Linux конектится без проблем, win95 никак. Такое впечатление что с некоторого момента он перестает реагировать на IPCP-пакеты:

/var/log/ppp:

using channel 85
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS4
sent [LCP ConfReq id=0x1 <mru 1504> <asyncmap 0x0> <auth pap> <magic 0x3652bfe6> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <mru 1504> <asyncmap 0x0> <auth pap> <magic 0x3652bfe6> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <mru 1504> <asyncmap 0x0> <auth pap> <magic 0x3652bfe6> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x3 <asyncmap 0xa0000> <magic 0x2c408d> <pcomp> <accomp> <callback CBCP>]
sent [LCP ConfAck id=0x3 <asyncmap 0xa0000> <magic 0x2c408d> <pcomp> <accomp> <callback CBCP>]
rcvd [LCP ConfAck id=0x1 <mru 1504> <asyncmap 0x0> <auth pap> <magic 0x3652bfe6> <pcomp> <accomp>]
rcvd [PAP AuthReq id=0x1 user="ppp" password=<hidden>]
user ppp logged in
sent [PAP AuthAck id=0x1 "Success"]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x1 <addr 192.168.100.1> <compress VJ 0f 01>]
IPCP: timeout sending Config-Requests
sent [LCP TermReq id=0x2 "No network protocols running"]
rcvd [LCP TermAck id=0x2]
Connection terminated.
Connect time 0.6 minutes.
Sent 160 bytes, received 0 bytes.

В файле options следующее:

lock
-detach
modem
crtscts
proxyarp
asyncmap 0
ms-dns 192.168.100.1
nodeflate
nobsdcomp
logfile /var/log/pppd

плюс в options.ttyS4 строка
192.168.100.1:192.168.100.22

Причем один единственный раз он таки подключился. Повторить не удалось. Возможно проблема в модеме или качестве связи.
Третий день не могу справиться.