I have openbsd-based pppoe server for small lan with 20-30 WinXP and Vista clients (based on user-level ppp)

After some time some random clients seems to be dead (XP and Vista)

When i try disconnect/reconnect dead host to pppoe, connection established but i cannot ping hosts, link is dead.

When i try to connect with different ppp username from same computer, connection establised and all OK.

I see in firewall log "pass" rule for this connection, but can't see any traffic

Maybe somebody knows where is the problem ?

(same pppoe server config with OpenBSD 4.3 works without problems)
My config:
kernel 4.5 GENERIC + pflow patch from Joerg Goltermann
devices

-------

/dev/tun0..tun100 (i make 100 tun devices with MAKEDEV)
/etc/ppp/ppp.secret

-------------------

user1 pass1 192.168.100.1

user2 pass2 192.168.100.2

..

user30 pass30 192.168.100.30
/etc/ppp/ppp.conf

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default:

 set log Phase Chat LCP IPCP CCP tun command

 set device /dev/cua01

 set speed 115200

 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" AT OK-AT-OK ATE1Q0 OK \\dATDT\\T TIMEOUT 40 CONNECT"
pppoe:

 set timeout 0

 set device "!/usr/sbin/pppoe -i vr0"

 set mtu max 1492

 set mru max 1492

 set speed sync

 disable acfcomp protocomp

 deny acfcomp

 enable chap

 set ifaddr

 set dns 192.168.70.250

 accept dns

 set ifaddr 192.168.100.254 192.168.100.1-192.168.100.253 255.255.255.255

 disable ipv6cp

 enable mssfixup

 enable lqr

 set lqrperiod 5
/etc/rc.local

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/usr/sbin/pppoe -p pppoe -i vr0 -s