求助，iptables的nat问题

樱家冢

我们寝室是用PPPoE拨号上网的，我自己能拨号，用一块网卡，同学上不了。我的iptables文件是这样的，请gugong指教。

# Generated by iptables-save v1.2.6a on Tue Oct 29 22:28:14
*mangle
REROUTING ACCEPT [3184]
:INPUT ACCEPT [3182]
:FORWARD ACCEPT [2]
:OUTPUT ACCEPT [2797]
OSTROUTING ACCEPT [2799]
COMMIT
# Completed on Tue Oct 29 22:28:14 2002
# Generated by iptables-save v1.2.6a on Tue Oct 29 22:28:14 2002
*nat
REROUTING ACCEPT [73]
OSTROUTING ACCEPT [22]
:OUTPUT ACCEPT [213]
[212] -A POSTROUTING -o 192.168.0.1 -j MASQUERADE
COMMIT
# Completed on Tue Oct 29 22:28:14 2002
# Generated by iptables-save v1.2.6a on Tue Oct 29 22:28:14 2002
*filter
:INPUT ACCEPT [20227]
:FORWARD ACCEPT [370]
:OUTPUT ACCEPT [15374]
COMMIT
# Completed on Tue Oct 29 22:28:14 2002

PS:我的IP是192.168.0.1，掩码255.255.255.0，PPPoE拨号得到的是动态的IP，我的iptables该怎么改？