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> send // 送出到 Primary DNS<br>
$ // Ctrl-C or Ctrl-D 離開<br>
<br>
驗證一下，是不是更新成功：<br>
<br>
$ host mail.example.com ns.example.com<br>
mail.example.com has address 210.64.233.10<br>
$<br>
<br>
恭喜您更新成功了，如果您沒有成功，請到 Primary DNS 上看 messages 紀錄檔。<br>
注意， key 檔案的權限，應該只有 owner 可以讀寫，應為 -rw------- 請注意。<br>
執行 nsupdate 的 user，應為 key 的 owner，否則會發生 Permission denied<br>
的情形。<br>
<br>
如果您要讓您的電腦自動更新，這裡有我自己寫的 script 供參考：<br>
<br>
建立一個 tmp.txt 內容如下：<br>
<br>
----- tmp.txt ----------<br>
server ns.example.com<br>
update delete mail.example.com A<br>
update add mail.example.com 0 A SERVER_NEW_IP<br>
send<br>
----- End of File ----------<br>
<br>
建立更新的 script: newip.sh<br>
<br>
----- newip.sh ----------<br>
#!/bin/sh<br>
#<br>
# Written by LeoLiou.<br>
#<br>
<br>
# config the update dir.<br>
exe_path=/root/nsupdate<br>
<br>
new_IP=`/sbin/ifconfig eth0 | grep 'inet addr' | cut -d: -f 2 <br>
| cut -d' ' -f1`<br>
<br>
/bin/cat $exe_path/tmp.txt | sed s/SERVER_NEW_IP/$new_IP/g <br>
> $exe_path/update.txt<br>
<br>
# update now IP to name server.<br>
/usr/bin/nsupdate -k $exe_path/Kmail.+157+44587.key -v $exe_path/update.txt<br>
----- End of File ----------<br>
<br>
請將您的 key, tmp.txt, newip.sh 放置於同一目錄，並給予 newip.sh 執行權限。<br>
請執行一次 newip.sh 確定沒有問題之後，再利用 crontab 執行 newip.sh 即可。<br>
<br>
0 * * * * /root/nsupdate/newip.sh<br>
<br>
這樣就完成整個動態 IP 更新機制了。<br>
<br>
關於 update-policy，請看 BIND 9 Administrator Reference Manual：<br>
<br>
http://www.isc.org/products/BIND/bind9.html<br>
<br>
dnssec-keygen 與 nsupdate 的使用方法，相信 man page 寫得已經很清楚了。<br>
icon_smile.gif<br>
<br>
-- <br>
Leo Liou (leo@i18n.linux.org.tw)<br>
<br>
Join i18n project: http://i18n.linux.org.tw/<br>
<br>
<br>
* ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~<br>
<br>
---------------<br>
補充 by netman on October 30, 2002﹕<br>
---------------<br>
<br>
我略為修改了 Leo兄 的 script ﹐並置於 /root/nsupdate 目錄下面。<br>
我這裡將界面改為 ppp0 ﹐同時也減少不必要的傳送動作。<br>
(註﹕原本的 tmp.txt 我也改名為 nsupdate.scr 了﹐請留意。)<br>
<br>
內容如下﹕<br>
<br>
#!/bin/bash<br>
#<br>
# Written by LeoLiou.<br>
# Modified by netman on 2002/09/26<br>
#<br>
<br>
# set variables<br>
if echo $0 | grep '^/' ; then<br>
w_dir=${0%/*}<br>
else<br>
w_dir=$PWD/${0%/*}<br>
fi<br>
KEY_FILE=$w_dir/Kmail.+157+44587.key<br>
UPDATE_SCR=$w_dir/nsupdate.scr<br>
UPDATE_DATA=$w_dir/nsupdate.data<br>
HOST_NAME=mail.example.com<br>
NS_SERVER=ns.example.com<br>
IF="ppp0"<br>
<br>
# ensure key files<br>
for file in $KEY_FILE ${KEY_FILE%key}private<br>
do<br>
if [ ! -r $file ]; then<br>
echo "$(basename $0): ERROR: $file is not readable."<br>
exit 1<br>
fi<br>
done<br>
<br>
# prepare initial script<br>
test -f $UPDATE_SCR || {<br>
cat >| $UPDATE_SCR <<-ENDSCR<br>
server NS_SERVER<br>
update delete HOST_NAME A<br>
update add HOST_NAME 0 A NEW_IP<br>
send<br>
ENDSCR # <----- 請將 ENDSCR 前面的空白換成 tab ！<br>
test "$?" = "0" || {<br>
echo "$(basename $0): ERROR: could not create $UPDATE_SCR."<br>
exit 2<br>
}<br>
}<br>
<br>
# ensure the server is connectable<br>
host $NS_SERVER $NS_SERVER | grep "$NS_SERVER" &>/dev/null || {<br>
echo "$(basename $0): ERROR: could not contact nameserver $NS_SERVER."<br>
exit 3<br>
}<br>
<br>
# get current ip<br>
NEW_IP=$(ifconfig | grep "$IF " -A 1 <br>
| awk '/inet/ {print $2}' | sed -e 's/.*://')<br>
<br>
# do a test then update<br>
host $HOST_NAME $NS_SERVER | grep "$NEW_IP" &>/dev/null || {<br>
/bin/cat $UPDATE_SCR | sed s/NEW_IP/$NEW_IP/ <br>
| sed s/NS_SERVER/$NS_SERVER/ <br>
| sed s/HOST_NAME/$HOST_NAME/ <br>
>| $UPDATE_DATA<br>
/usr/bin/nsupdate -k $KEY_FILE -v $UPDATE_DATA || rm -rf $UPDATE_DATA<br>
}<br>
<br>
#-- end of script --#<br>
<br>
上面的 script 可於這裡下載：<br>
http://study-area.ks.edu.tw/linux/src/newip.sh.tgz<br>
<br>
目前這個 script 只能在 linux client 上執行﹐<br>
但我想﹐透過簡單的 cgi 功能﹐那麼任何的 windows client 也能輕鬆的進行更新﹐<br>
不過﹐這部份就需要其他朋友幫忙設定了。<br>
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