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/sbin/ipchains -A input -j DENY -d 0.0.0.0<br><br>
############################################<br>
echo ""<br>
echo "STarting http ............"<br>
#from Internet & Intranet<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 1024: -d a.b.c.dns/32 www -j ACCEPT<br>
/sbin/ipchains -A input -p udp -s 0.0.0.0/0 1024: -d a.b.c.dns/32 www -j ACCEPT<br>
#Response<br>
/sbin/ipchains -A input -p tcp -s a.b.c.dns www -d 0.0.0.0/0 1024: -i eth2 -j ACCEPT<br>
/sbin/ipchains -A input -p udp -s a.b.c.dns www -d 0.0.0.0/0 1024: -i eth2 -j ACCEPT<br>
############################################<br>
echo ""<br>
echo "Starting FTP......................"<br>
#From Internet & Intranet<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 1024: -d a.b.c.dns/32 ftp -j ACCEPT<br>
#Response<br>
/sbin/ipchains -A input -p tcp -s a.b.c.dns/32 ftp -d 0.0.0.0/0 1024: -i eth2 -j ACCEPT<br>
##################################################<br>
echo ""<br><br>
echo "Starting Domain ............."<br>
# From Internet & intranet<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 -d a.b.c.dns/32 domain -j ACCEPT<br>
/sbin/ipchains -A input -p udp -s 0.0.0.0/0 -d a.b.c.dns/32 domain -j ACCEPT<br><br>
# Response<br>
/sbin/ipchains -A input -p tcp -s a.b.c.dns/32 domain -d 0.0.0.0/0 -j ACCEPT<br>
/sbin/ipchains -A input -p udp -s a.b.c.dns/32 domain -d 0.0.0.0/0 -j ACCEPT<br><br>
#To Internet query<br>
/sbin/ipchains -A input -p tcp -s a.b.c.dns/32 -d 0.0.0.0/0 domain -i eth2 -j ACCEPT<br>
/sbin/ipchains -A input -p udp -s a.b.c.dns/32 -d 0.0.0.0/0 domain -i eth2 -j ACCEPT<br><br>
#response<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 domain -d a.b.c.dns/32 -i eth0 -j ACCEPT<br>
/sbin/ipchains -A input -p udp -s 0.0.0.0/0 domain -d a.b.c.dns/32 -i eth0 -j ACCEPT<br><br>
####################################################'<br>
echo ""<br>
echo "Starting Telnet................"<br>
#From Intranet<br>
/sbin/ipchains -A input -p tcp -s 10.100.100.0/24 1024: -d a.b.c.dns/32 telnet -i eth1 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s a.b.c.fw/32 1024: -d a.b.c.m2/32 telnet -i eth0 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s 10.100.100.0/24 1024: -d 10.100.200.2/32 telnet -i eth1 -j ACCEPT<br>
#以上允许总部主机对DMZ，FIREWALL进行维护，允许FIREWALL对MAIL2维护，当然最好不用TELNET，<br>
通过SSH维护。<br><br>
#Response<br>
/sbin/ipchains -A input -p tcp -s a.b.c.dns/32 telnet -d 10.100.100.0/24 1024: -i eth2 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s a.b.c.m2/32 telnet -d a.b.c.fw/32 1024: -i eth0 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s 10.100.200.2/32 telnet -d 10.100.100.0/24 1024: -i eth1 -j ACCEPT<br><br>
####################################################<br>
echo ""<br>
echo "Starting smtp ....................."<br>
# From Internet <br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 -d a.b.c.fw/32 smtp -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s a.b.c.fw/32 smtp -d 0.0.0.0/0 -j ACCEPT<br><br>
#To Internet<br>
/sbin/ipchains -A input -p tcp -s a.b.c.fw/32 -d 0.0.0.0/0 smtp -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 smtp -d a.b.c.fw/32 -j ACCEPT<br><br>
#From Intranet<br>
/sbin/ipchains -A input -p tcp -s 10.100.0.0/16 -d 10.100.200.2/32 -i eth1 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s 10.100.200.2/32 -d 10.100.0.0/16 -i eth1 -j ACCEPT<br><br>
#To Intranet<br>
/sbin/ipchains -A input -p tcp -s 10.100.200.2/32 -d 10.100.0.0/16 smtp -i eth1 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s 10.100.0.0/16 smtp -d 10.100.200.2/32 -i eth1 -j ACCEPT<br><br>
###################################<br>
echo ""<br>
echo "Starting pop-3.................."<br><br>
#From Internet<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 1024: -d a.b.c.fw/32 pop-3 -i eth0 -j ACCEPT<br><br>
#Response<br>
/sbin/ipchains -A input -p tcp -s a.b.c.fw/32 pop-3 -d 0.0.0.0/0 1024: -i eth0 -j ACCEPT<br><br>
#Pop3 Relay<br>
/sbin/ipchains -A input -p tcp -s 0.0.0.0/0 1024: -d a.b.c.fw/32 60100:60111 -i eth0 -j ACCEPT <br><br>
/sbin/ipchains -A input -p tcp -s a.b.c.fw/32 -d 10.100.0.0/16 pop-3 -i eth1 -j ACCEPT<br>
/sbin/ipchains -A input -p tcp -s 10.100.200.2/32 -d 10.100.0.0/16 pop-3 -i eth1 -j ACCEPT<br>
#Response<br>
/sbin/ipchains -A input -p tcp -s 10.100.0.0/16 pop-3 -d 0.0.0.0/0 1024: -i eth1 -j ACCEPT<br><br><br>
#################################<br>
echo ""<br>
echo "Starting Define icmp packets"<br><br>
/sbin/ipchains -A input -p icmp -j ACCEPT<br><br>
#####################################<br>
echo ""<br>
echo "Starting define default rules for input chain"<br>
/sbin/ipchains -A input -j REJECT -l<br><br>
六、Email系统（sendmail-8.10.0-1，imap-4.7-5）<br><br>
Email系统相对复杂，请多阅读论坛文章，我的方案参考了Jephe的“中小型企业的Sendmail
邮件服务器应用实例” <br>
公司用统一域名domain.com。Firewall同时作为Email网关，下设深圳，广州，北京等Sendmail服务器<br>
(名字分别为：mssz, msgz, msbj)。<br>
<br>
(一)、Firewall上的配置文件：<br>
A. /etc/sendmail.cf<br>
该文件先由下面文件redhat.mc通过命令 m4 redhat.mc > /etc/sendmail.cf产生：<br>
redhat.mc的内容：<br>
divert(-1)<br>
dnl This is the macro config file used to generate the /etc/sendmail.cf<br><br>
dnl file. If you modify thei file you will have to regenerate the<br>
dnl /etc/sendmail.cf by running this macro config through the m4<br>
dnl preprocessor:<br>
dnl<br>
dnl m4 /etc/sendmail.mc > /etc/sendmail.cf<br>
dnl<br>
dnl You will need to have the sendmail-cf package installed for this to<br>
dnl work.<br>
include(`../m4/cf.m4')<br>
define(`confDEF_USER_ID',``8:12'')<br>
OSTYPE(`linux')<br>
undefine(`UUCP_RELAY')<br>
undefine(`BITNET_RELAY')<br>
define(`confAUTO_REBUILD')<br>
define(`confTO_CONNECT', `1m')<br>
define(`confTRY_NULL_MX_LIST',true)<br>
define(`confDONT_PROBE_INTERFACES',true)<br>
define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')<br>
define('ALIAS_FILE','/etc/mail/aliases')<br>
define('SMTP_MAILER_FLAGS','0')<br>
FEATURE(`smrsh',`/usr/sbin/smrsh')<br>
dnl FEATURE(`mailertable',`hash -o /etc/mail/mailertable')<br>
FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable')<br>
FEATURE(`domaintable',`hash -o /etc/mail/domaintable')<br>
FEATURE(redirect)<br>
FEATURE(always_add_domain)<br>
FEATURE(use_cw_file)<br>
FEATURE(local_procmail)<br>
FEATURE(`access_db')<br>
FEATURE(`blacklist_recipients')<br>
dnl We strongly recommend to comment this one out if you want to protect<br>
dnl yourself from spam. However, the laptop and users on computers that do<br>
dnl not hav 24x7 DNS do need this.<br>
dnl FEATURE(`accept_unresolvable_domains')<br>
dnl FEATURE(`relay_based_on_MX')<br>
MAILER(smtp)<br>
MAILER(procmail)<br><br>
然后修改： 设置/etc/sendmail.cf中的DM部分为：<br>
DMdomain.com<br><br>
B. /etc/mail/access<br>
localhost.localdomain RELAY<br>
localhost RELAY<br>
127.0.0.1 RELAY<br>
domain.com RELAY<br>
yzy@domain.com deny<br><br>
#需限制 Internet mail 的用户象上面那样写，不需限制的则不用写。<br><br>
C. /etc/mail/local-host-names<br>
修改/etc/mail/local-host-names内容为domain.com<br>
D. /etc/mail/mailertable<br>
更改/etc/mail/mailertable内容为：<br>
sz.st-anda.com smtp:[10.100.100.252]<br>
gz.st-anda.com smtp:[10.100.101.252]<br><br>
bj.st-anda.com smtp:[10.100.109.252]<br><br>
E. /etc/mail/relay-domains <br>
10.100.100.252<br>
10.100.101.252<br>
10.100.109.252<br><br>
F. /etc/mail/aliases<br>
szuser@sz.domain.com<br>
gzuser@gz.domain.com<br>
bjuser@bj.domain.com<br><br>
G. /etc/hosts<br>
加入下面内容：<br>
168.100.100.252 mssz.sz.st-anda.com mssz<br>
168.100.101.252 msgz.gz.st-anda.com msgz<br>
168.100.102.252 mstj.tj.st-anda.com mstj<br><br>
上面很多文件的修改都需要运行 makemap hash 命令以实现对数据库文件的更新。<br>
具体以access为例： <br>
makemap hash /etc/mail/access.db < /etc/mail/access<br><br>
（二）、深圳服务器mssz<br><br>
A. /etc/sendmail.cf<br>
基本与firewall上相同。但需修改DS项：<br>
设置/etc/sendmail.cf中的DS部分为DSfirewall1.domain.com<br><br>
B. /etc/mail/access<br>
localhost.localdomain RELAY<br>
localhost RELAY<br>
127.0.0.1 RELAY<br>
st-anda.com RELAY<br>
C. /etc/mail/local-host-names<br>
修改/etc/mail/local-host-names内容为<br>
domain.com<br>
sz.domain.com<br>
D. /etc/mail/relay-domains <br>
10.100.<br>
E. /etc/mail/mailertable<br>
更改/etc/mail/mailertable内容为：<br>
sz.st-anda.com smtp:[10.100.100.252]<br>
gz.st-anda.com smtp:[10.100.101.252]<br>
bj.st-anda.com smtp:[10.100.109.252]<br>
F. /etc/mail/aliases<br>
szuser@sz.domain.com<br>
gzuser@gz.domain.com<br>
bjuser@bj.domain.com<br>
G. /etc/hosts<br>
加入下面内容：<br>
168.100.100.252 mssz.sz.st-anda.com mssz<br>
168.100.101.252 msgz.gz.st-anda.com msgz<br>
168.100.102.252 mstj.tj.st-anda.com mstj<br>
168.100.200.2 firewall1.st-anda.com firewall1<br><br>
广州，北京服务器配置方法与深圳类似。<br>
另外：<br>
1、通过在Firewall的/etc/mail/access中设置：yzy@domain.com deny , 可以让某些帐号不允
许收发Internet Mail。<br>
2、DNS不用设置内部Email服务器的细节，只需对外公布domain.com域的MX记录为a.b.c.fw。<br>
3、所有Email服务器都属于domain.com，且指向同一DNS服务器：a.b.c.dns<br>
4、维护时Email系统时，可以用ssh的scp功能(复制文件到其它Linux机器时不用提示密码，
当做别名文件同步时，可以写一个脚本，一下子就可以把所有的sendmail服务器同步。)，
这对Email管理员非常有用。<br><br>
结束语：以上绝大多数都是前人经验，我只是做了归纳和总结。以前我主要用NT，
改成Linux以后，有一种翻身作主人的感觉。写得还不够详细（主要因为偷懒 :-)）。
希望大家一起推动Linux向前发展。
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