vadny CDMA modem nebo problem v Iptables?

[sniper_2 na centrum.cz]

Zdravim, 
	resim nasledujici problem. Na mistnim "serveru" (Duron 650, 96MB RAM, 8GB 
HDD, Gentoo 2005.1, 2.6.14-r5) se pripojuji pomoci CDMA od eurotelu (modem 
Gtran). Pomoci Yagi anteny mam signal vsech pet carek. A rychlost je okolo 
430kbs. Takze jsem relativne spokojen. Kdyz dam stahnovat nejaky vetsi soubor 
(klidne 60MB), nebo prohlizem net pomoci elinksu tak je vse v poradku a modem 
si drzi pridelenou adresu.

kdyz ale spustim script:
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "0" > /proc/sys/net/ipv4/ip_dynaddr
/sbin/iptables -t nat -F
/sbin/iptables -t nat -X
/sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE


zacne modem blaznit a neustale je mu pridelovano nove IP:
--> Connect time 0.1 minutes.
--> local  IP address 10.162.233.159
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.1 minutes.
--> local  IP address 10.162.220.132
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.2 minutes.
--> local  IP address 10.162.209.90
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.0 minutes.
--> local  IP address 10.162.199.27
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.4 minutes.
--> local  IP address 10.162.194.105
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.1 minutes.
--> local  IP address 10.162.247.143
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.3 minutes.
--> local  IP address 10.162.244.4
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
--> Connect time 0.3 minutes.
--> local  IP address 10.162.198.250
--> remote IP address 10.160.4.6
--> primary   DNS address 160.218.10.200
--> secondary DNS address 160.218.43.200
a toto bezi neustale dokola, takze v siti se prakticky neda prohlizet net ani 
nic jineho delat. Obcas se sice stane ze modem zustane viset na jedne ip 
dele. (rekord 434 minut)

po zadani prikazu:
echo "0" > /proc/sys/net/ipv4/ip_forward
vsak modem zustane na posledni pridelne IP adrese a vesele muzu v ramci 
serveru stahnovat dal a nic se nedeje.


Myslite ze je problem v maskarade nebo mam jit reklamovat modem?



Pripojuji jeste vytaceci scripty, pripojuji se pres Wvdial.
[Dialer CDMA]
Modem = /dev/ttyACM0
Baud = 1500000
Init1 = ATQ
Init2 = ATZ
Phone = #777
Username = 601xxxxxxx na etcz
Password = xxxxxxxx
Dial Command = ATDT
Stupid Mode = 1
chap-max-challenge = 0
Idle Seconds = 36000
Auto DNS = 0