pptpd +iptables=падает eth1 через 3 часа

Стоял сервер Debian Etch со squid и раздавал интернет по одному и тому же интерфейсу eth1 (так же на нем стоит openvz и крутятся еще такие же 4 guest системы).Недавно я успешно обновил систему до Lenny и заменил squid на pptpd. Теперь каждые часа 3 или когда просто начинаешь качать через p2p eth1 просто перестает пингваться,приходится в ручную нажимать на ресет.В логах - пусто:

[code]Oct 14 19:28:55 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:29:02 lehus3 tcplog: port 2104 request from 87.117.51.71
Oct 14 19:29:05 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:29:15 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:29:17 lehus3 tcplog: port 1605 request from 92.112.0.52
Oct 14 19:29:25 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:29:32 lehus3 tcplog: port 3200 request from 188.134.9.209
Oct 14 19:29:35 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:29:45 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:29:47 lehus3 tcplog: port 59039 request from 10.168.50.120
Oct 14 19:29:55 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:30:02 lehus3 tcplog: port 59039 request from 10.168.50.120
Oct 14 19:30:05 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:30:15 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:30:17 lehus3 tcplog: port 1605 request from 92.112.0.52
Oct 14 19:30:25 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:30:29 lehus3 pppd[7512]: No response to 4 echo-requests
Oct 14 19:30:29 lehus3 pppd[7512]: Serial link appears to be disconnected.
Oct 14 19:30:29 lehus3 pppd[7512]: Connect time 251.0 minutes.
Oct 14 19:30:29 lehus3 pppd[7512]: Sent 99319398 bytes, received 85714163 bytes.
Oct 14 19:30:31 lehus3 pppd[7839]: No response to 4 echo-requests
Oct 14 19:30:31 lehus3 pppd[7839]: Serial link appears to be disconnected.
Oct 14 19:30:31 lehus3 pppd[7839]: Connect time 232.0 minutes.
Oct 14 19:30:31 lehus3 pppd[7839]: Sent 65012652 bytes, received 1805562 bytes.
Oct 14 19:30:32 lehus3 tcplog: port 2104 request from 193.108.249.216
Oct 14 19:30:32 lehus3 pppd[7512]: Connection terminated.
Oct 14 19:30:32 lehus3 pppd[7512]: Modem hangup
Oct 14 19:30:32 lehus3 pppd[7512]: Exit.
Oct 14 19:30:34 lehus3 pppd[7839]: Connection terminated.
Oct 14 19:30:34 lehus3 pppd[7839]: Modem hangup
Oct 14 19:30:34 lehus3 pppd[7839]: Exit.
Oct 14 19:30:34 lehus3 pppd[12493]: No response to 4 echo-requests
Oct 14 19:30:34 lehus3 pppd[12493]: Serial link appears to be disconnected.
Oct 14 19:30:34 lehus3 pppd[12493]: Connect time 5.5 minutes.
Oct 14 19:30:34 lehus3 pppd[12493]: Sent 804462 bytes, received 156436 bytes.
Oct 14 19:30:35 lehus3 icmplog: destination unreachable from lehus3.local
Oct 14 19:30:37 lehus3 pppd[12493]: Connection terminated.
Oct 14 19:30:37 lehus3 pppd[12493]: Modem hangup
Oct 14 19:30:37 lehus3 pppd[12493]: Exit.
Oct 14 19:30:38 lehus3 pppd[10798]: No response to 4 echo-requests
Oct 14 19:30:38 lehus3 pppd[10798]: Serial link appears to be disconnected[/code]

Вот iptables -L :

Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT gre -- anywhere anywhere
ACCEPT tcp -- anywhere anywhere tcp dpt:1723

Chain FORWARD (policy ACCEPT)
target prot opt source destination
TCPMSS tcp -- anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS clamp to PMTU

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

прошу вашей помощи,т.к я уже третий день мучаюсь