使用串口通信，在备机端使用如下脚本检测来自主机的心跳信号，一旦未接受次数超过指定记数，备机认为主机DOWN机，自动设置为主机的网络参数，顶替主机提供服务。

# ! perl -w use strict; use Win32 :: SerialPort; my $port = ' COM2 ' ; # serail port name registried in OS my $count = 0 ; # count number of heartbeat-receiving failture my $max_count = 5 ; # max fail count to be tolerated my $interface = ' # ---------------------------------- # 接口 IP 配置 # ---------------------------------- pushd interface ip# "local" 的接口 IP 配置set address name="local" source=static addr=192.168.6.185 mask=255.255.255.0set address name="local" gateway=192.168.6.65 gwmetric=0set dns name="local" source=static addr=192.168.6.112 register=PRIMARYadd dns name="local" addr=192.168.6.201 index=2set wins name="local" source=static addr=nonepopd# 接口 IP 配置结束 ' ; # net inetrface config information sub errlog { # log the failtrue occuring time open ERR , ' >>err.log ' ; my @time = localtime (); my $time = sprintf ( " %d " , $time [ 5 ] + 1900 ) . ' - ' . sprintf ( " %d " , $time [ 4 ] + 1 ) . ' - ' . " $time[3] " . ' ' . sprintf ( " %.2d " , $time [ 2 ]) . ' : ' . sprintf ( " %.2d " , $time [ 1 ]) . ' : ' . sprintf ( " %.2d " , $time [ 0 ]); print ERR $time . " \n " ; close ERR;} sub ipchange { # change ip addrress open TMP , ' >tmp ' ; print TMP $interface ; close TMP; eval { system ' netsh -f tmp ' ; unlink ' tmp ' ; }; if ($@) { return 0 ;} return 1 ;} my $ob = Win32 :: SerialPort -> new( $port ) or die " CANNOT OPEN $port " ; # open serial port eval { # set serial port properties $ob -> baudrate( 9600 ); $ob -> parity( ' none ' ); $ob -> databits( 8 ); $ob -> stopbits( 1 ); $ob -> handshake( ' none ' );}; if ($@) { die ' SET FAILED ' ;} $ob -> write_settings or die " CANNOT WRITE $port DRIVER " ; # write to port driver to make it active while ( 1 ) { # loop receiving heartbeat from remote machine # change ip address after designated count of failture my ( $length , $result ) = $ob -> read ( 10 ); if ( $result ) { $count = 0 ; } elsif ( $count == $max_count ) { errlog(); if (not ipchange()) { print ' IP CHANGE FAILED ' ; } last ; } else { $count ++ ; } sleep ( 1 );} undef $ob ;