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一．linux与linux之间的互拔：
请看图一：
我家里： 办公室：
机器名：j128 机器名：vms68
os: redhat5.1 os: redhat5.1
ip: 192.168.88.128 <—-电话网—-> ip: 192.168.89.68 <—>
internet
| [ttys0] [ttys1] [ttys0]
|网线
|
机器名：j003
os: win98
ip: 192.168.88.3
第一步要配置linux为ppp服务器，允许拔入，如姚飞所说：
使用mgetty
(以下假设modem装在ttys0)
cd /etc
vi inittab
add :
d1:2345:respawn:/sbin/mgetty ttys0 # com1口允许拔入
d2:2345:respawn:/sbin/mgetty ttys1 # com2口允许拔入
then: init q # 重读配置文件/etc/inittab
注意, 如果想拔号出去, pppd 使用的设备也必须是/dev/ttys0或/dev/ttys1,
而不是/dev/modem, 要不然是拨不出去的.
我这样做后，j128和vms68都可允许拔入，但还不是ppp server，还需要以下几步：
在vms68里：
adduser ppp #新加一个用户
passwd ppp #为ppp起个密码
在/home/ppp下建一个脚本ppplogin，内容如下：
exec /usr/sbin/pppd 115200 modem asyncmap 0 proxyarp \
192.168.89.68:192.193.89.69
##### localip:remoteip
vi /etc/passwd
将这行ppp:xxxx:505:505:ppp acount:/home/ppp:/bin/bash
改为ppp:xxxx:505:505:ppp acount:/home/ppp:/home/ppp/ppplogin
在j128里：
adduser ppp #新加一个用户
passwd ppp #为ppp起个密码
在/home/ppp下建一个脚本ppplogin，内容如下：
exec /usr/sbin/pppd 115200 modem asyncmap 0 proxyarp \
0.0.0.0:0.0.0.0.0 ###等vms68分配ip地址
vi /etc/passwd
将这行ppp:xxxx:505:505:ppp acount:/home/ppp:/bin/bash
改为ppp:xxxx:505:505:ppp acount:/home/ppp:/home/ppp/ppplogin
下一步要配j128拔到vms68，这很简单，
跟拔到internet是一样的，文件ppp-onvms68如下：
# script to initiate a ppp connection. this is the first part of the
# pair of scripts. this is not a secure pair of scripts as the codes
# are visible with the ps command. however, it is simple.
#
# these are the parameters. change as needed.
telephone=xxxx # the telephone number for the connection
account=ppp # the account name for logon (as in george burns)
password=xxxx # the password for this account (and gracie allen)
local_ip=0.0.0.0 # local ip address if known. dynamic = 0.0.0.0
remote_ip=0.0.0.0 # remote ip address if desired. normally 0.0.0.0
netmask=255.255.255.0 # the proper netmask if needed
#
# export them so that they will be available at ppp-on-dialer time.
export telephone account password
#
# this is the location of the script which dials the phone and logs
# in. please use the absolute file name as the $path variable is not
# used on the connect option. (to do so on a root account would be
# a security hole so dont ask.)
#
dialer_script=/home/ppp/ppp-on-dialer
#
# initiate the connection
#
# i put most of the common options on this command. please, dont
# forget the lock option or some programs such as mgetty will not
# work. the asyncmap and escape will permit the ppp link to work with
# a telnet or rlogin connection. you are welcome to make any changes
# as desired. dont use the defaultroute option if you currently
# have a default route to an ethernet gateway.
#
exec /usr/sbin/pppd /dev/ttys0 115200 modem $local_ip:$remote_ip \
defaultroute lock crtscts asyncmap 0 connect $dialer_script \
debug
现在配vms68拔到j128，文件ppp-onj128如下:
# script to initiate a ppp connection. this is the first part of the
# pair of scripts. this is not a secure pair of scripts as the codes
# are visible with the ps command. however, it is simple.
#
# these are the parameters. change as needed.
telephone=xxxx # the telephone number for the connection
account=ppp # the account name for logon (as in george burns)
password=xxxx # the password for this account (and gracie allen)
local_ip=192.168.89.68 # local ip address if known. dynamic = 0.0.0.0
remote_ip=192.168.89.69 # remote ip address if desired. normally 0.0.0.0
netmask=255.255.255.0 # the proper netmask if needed
#
# export them so that they will be available at ppp-on-dialer time.
export telephone account password
#
# this is the location of the script which dials the phone and logs
# in. please use the absolute file name as the $path variable is not
# used on the connect option. (to do so on a root account would be
# a security hole so dont ask.)
#
dialer_script=/home/ppp/ppp-on-dialer
#
# initiate the connection
#
# i put most of the common options on this command. please, dont
# forget the lock option or some programs such as mgetty will not
# work. the asyncmap and escape will permit the ppp link to work with
# a telnet or rlogin connection. you are welcome to make any changes
# as desired. dont use the defaultroute option if you currently
# have a default route to an ethernet gateway.
#
exec /usr/sbin/pppd /dev/ttys1 115200 modem $local_ip:$remote_ip \
lock crtscts asyncmap 0 connect $dialer_script \
debug
这里要注意local_ip和remote_ip要给值，还有的是在pppd里没有defaultroute。
因为vms68还要拔上internet，所以不要defaultroute。
在j128上用ppp-onvms68拔上vms68，连通后telnet vms68，执行以下命令：
nohup sleep 30;ppp-onj128
然后在j128上断线，等待vms68拔入。拔通后，在j128上要执行以下命令：
route add -net 192.168.89.0 gw 192.168.89.69 ppp0
route add default gw 192.168.89.69 ppp0
ipfwadm -f -a m -s 192.168.88.0/24 -d 0.0.0.0/0
现在可再telnet vms68，在vms68上拔号上网，这样j003可通过j128，再通
过vms68上网，我也不用付任何费用。
二．win98与linux之间的互拔：
请看图二：
我家里： 办公室：
机器名：j128 机器名：vms68
os: redhat5.1 os: redhat5.1
ip: 192.168.88.128 ip: 192.168.89.68 <—>
internet
| [ttys1] [ttys0]
|网线 |
| |
机器名：j003 |
os: win98 —————————
ip: 192.168.88.3 电话网
这里vms68要象第一步所说的，要配成允许拔入的ppp server。
这里主要是win98的配置，首先象上internet那样，在拔号网络里新建一个连接，
要注意两点，一要设置连通后弹出终端窗口，二是最主要的，在“控制面板”里
选“调制解调器”，选用来连线的modem，选“属性”按钮，选“连接”，再选
“高级”按钮，再在“附加设置”里输入&c0s0=001。
为什么要这样做？因为win98自带的ppp client会自动退出当远端ppp server挂线
时，因此要骗一骗win98，要modem不要报告断线，并自动应答拔入。&c0就是要
modem不要检测carrier，s0=001要modem在响一下后就应答。
现在配vms68拔到j003，文件ppp-onj003如下:
# script to initiate a ppp connection. this is the first part of the
# pair of scripts. this is not a secure pair of scripts as the codes
# are visible with the ps command. however, it is simple.
#
# these are the parameters. change as needed.
telephone=xxxx # the telephone number for the connection
#account=ppp # the account name for logon (as in george burns)
#password=xxxx # the password for this account (and gracie allen)
local_ip=192.168.89.68 # local ip address if known. dynamic = 0.0.0.0
remote_ip=192.168.89.69 # remote ip address if desired. normally 0.0.0.0
netmask=255.255.255.0 # the proper netmask if needed
#
# export them so that they will be available at ppp-on-dialer time.
export telephone ###account password
#
# this is the location of the script which dials the phone and logs
# in. please use the absolute file name as the $path variable is not
# used on the connect option. (to do so on a root account would be
# a security hole so dont ask.)
#
dialer_script=/home/ppp/ppp-on-dialer
#
# initiate the connection
#
# i put most of the common options on this command. please, dont
# forget the lock option or some programs such as mgetty will not
# work. the asyncmap and escape will permit the ppp link to work with
# a telnet or rlogin connection. you are welcome to make any changes
# as desired. dont use the defaultroute option if you currently
# have a default route to an ethernet gateway.
#
exec /usr/sbin/pppd /dev/ttys1 115200 modem $local_ip:$remote_ip \
lock crtscts asyncmap 0 connect $dialer_script \
debug
这里要注意local_ip和remote_ip要给值，还有的是在pppd里没有defaultroute。
因为vms68还要拔上internet，所以不要defaultroute。还有这里没有acount和
password，因为win98的ppp client不要用户名和密码，因此在ppp-on-dialer里
要把送acount和password的那两行去掉。
j003通过拔号拔上vms68后，要telnet vms68，在vms68里执行以下脚本：
kill `cat /var/run/ppp0.pid` ###注意如果是用ppp1，就用ppp1.pid
nohup sleep 30;ppp-onj003
这里要特别注意的一点是一定要在linux里断线，因为在win98里断线，则win98
的ppp client就会退出，就不会应答呼叫。
现在win98和linux之间就可以实现回拔了，但要注意win98的路由问题。
在win98下要自配一下路由，在win98的目录里有route程序，它的格式如下：
route print/add/delete/change (直接打route就有帮助看)
象我的j003，在没有拔号时，用route print得到如下信息：(行号是我加上的)
active routes:
network address netmask gateway address interface metric
1 0.0.0.0 0.0.0.0 192.168.88.128 192.168.88.3 1
2 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
3 192.168.88.0 255.255.255.0 192.168.88.3 192.168.88.3 1
4 192.168.88.3 255.255.255.255 127.0.0.1 127.0.0.1 1
5 192.168.88.255 255.255.255.255 192.168.88.3 192.168.88.3 1
6 224.0.0.0 224.0.0.0 192.168.88.3 192.168.88.3 1
7 255.255.255.255 255.255.255.255 192.168.88.3 0.0.0.0 1
通过拔号网络拔入vms68后，用route print得到如下信息：
active routes:
network address netmask gateway address interface metric
1* 0.0.0.0 0.0.0.0 192.168.89.69 192.168.89.69 1
2* 0.0.0.0 0.0.0.0 192.168.88.128 192.168.88.3 2
3 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
4 192.168.88.0 255.255.255.0 192.168.88.3 192.168.88.3 2
5 192.168.88.3 255.255.255.255 127.0.0.1 127.0.0.1 1
6 192.168.88.255 255.255.255.255 192.168.88.3 192.168.88.3 1
7 192.168.89.0 255.255.255.0 192.168.89.69 192.168.89.69 1
8 192.168.89.69 255.255.255.255 127.0.0.1 127.0.0.1 1
9 224.0.0.0 224.0.0.0 192.168.88.3 192.168.88.3 1
10 224.0.0.0 224.0.0.0 192.168.89.69 192.168.89.69 1
11 255.255.255.255 255.255.255.255 192.168.89.69 192.168.89.69 1
注意我打＊号的地方，从win98拔号到linux，win98会自动配置路由，从linux拔号到win98?
?
win98就得手工配置路由，打＊号的就是要在linux拔号到win98时要手工加上的。
现在telnet上vms68执行回拔脚本，连通后用route print得到如下信息：
active routes:
network address netmask gateway address interface metric
1 0.0.0.0 0.0.0.0 192.168.88.128 192.168.88.3 1
2 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
3 192.168.88.0 255.255.255.0 192.168.88.3 192.168.88.3 1
4 192.168.88.3 255.255.255.255 127.0.0.1 127.0.0.1 1
5 192.168.88.255 255.255.255.255 192.168.88.3 192.168.88.3 1
6 192.168.89.0 255.255.255.0 192.168.89.69 192.168.89.69 1
7 192.168.89.69 255.255.255.255 127.0.0.1 127.0.0.1 1
8 224.0.0.0 224.0.0.0 192.168.89.69 192.168.89.69 1
9 224.0.0.0 224.0.0.0 192.168.88.3 192.168.88.3 1
10 255.255.255.255 255.255.255.255 192.168.89.69 192.168.89.69 1
现在可看到跟上面的不同了，要在win98的dos窗口下执行以下批处理：
route change 0.0.0.0 mask 0.0.0.0 192.168.88.128 metric 2
route add 0.0.0.0 mask 0.0.0.0 192.168.89.69
现在再用route print就会得到如下信息：
.
active routes:
network address netmask gateway address interface metric
1 0.0.0.0 0.0.0.0 192.168.89.69 192.168.89.69 1
2 0.0.0.0 0.0.0.0 192.168.88.128 192.168.88.3 2
3 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
4 192.168.88.0 255.255.255.0 192.168.88.3 192.168.88.3 1
5 192.168.88.3 255.255.255.255 127.0.0.1 127.0.0.1 1
6 192.168.88.255 255.255.255.255 192.168.88.3 192.168.88.3 1
7 192.168.89.0 255.255.255.0 192.168.89.69 192.168.89.69 1
8 192.168.89.69 255.255.255.255 127.0.0.1 127.0.0.1 1
9 224.0.0.0 224.0.0.0 192.168.88.3 192.168.88.3 1
10 224.0.0.0 224.0.0.0 192.168.89.69 192.168.89.69 1
11 255.255.255.255 255.255.255.255 192.168.89.69 192.168.89.69 1
现在可telnet上vms68，在vms68上拔号到internet，现在j003可通过vms68上网了。
一些不足的地方：
一．要手工的地方太多，不大方便，请朋友们再改良一下。
二．只能用两个串口，我没有玩过多用户卡，请有经验的朋友指点一下在linux下用那种多用户卡最好，在那有卖，多少钱
