Debian 和 xp 共享 adsl 上网的问题

[Huisi Wang <huisiwang@gmail.com>]

debian sid 做主机：
/etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
	address 192.168.1.2
	netmask 255.255.255.0
	# dns-* options are implemented by the resolvconf package, if installed

auto eth1
iface eth1 inet static
	address 192.168.1.1
	netmask 255.255.255.0
	network 192.168.1.0
	broadcast 192.168.1.255

auto ppp0
iface ppp0 inet ppp
             provider dsl-provider
# please do not modify the following line
     pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf

并且，
echo "1" > /proc/sys/net/ipv4/ip_forward

root# modprobe iptable_nat
root# modprobe ipt_MASQUERADE
root# iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

用正确的网线连接两台电脑。
在xp设置
IP:192.168.1.100
netmask:255.255.255.0
gateway:192.168.1.1

但是，现在两台机器之间ping不通。不知是怎么回事，大家看看。
谢谢！

--
Best regards,
Huisi