A study of user authentication for client-server environment

: Ray:2015/10/1: ray@sharetech.com.tw

1

2()

3

:mail.

4

MasterSlaverMasterMaster

HA HA (/)

-(1/3)51:Slaver Master IP

-(2/3)62:Master

-(3/3)73:HA IP

-(1/4)81:Slaver Master IP

-(2/4)92:Master

-(3/4)103:Master

-(4/4)114: TCP 873, TCP 3306, TCP 1024IP

-12

-DNS(1/2)13

Q1:master ?MasterSlaver

-DNS(2/2)14

Q2:DNS?

MasterSlaver

-DNS CACHE15

A:DDNS 3-5A

16

FirewallMail Server1.POP3 Attack Smtp Attack2.Get PasswordHacker

3.Relay mail

spam mail

POP3 Attack

POP3 Attack- block ipHackerRelay mail-

Spam mail:1.MSIP,2.,

-IP (1/2)17:MSIP,

- IP (2/2)18:MSIP,

(1/8)19

1:

(2/8)20

(3/8)212:

(4/8)22

3: IP

(5/8)234: IP

(6/8)24

(7/8)25

IP

(8/8)26

5:

(1/5)27

1:

(2/5)28

2:

(3/5)29

3: SMTP LOG

(4/5)30

4:

(5/5)31

:

IP(1/7)321: http://whatismyipaddress.com/ IP

IP(2/7)332:

IP(3/7)34: Removal

IP(4/7)35: IP

IP(5/7)36: In listedIP, botnet

IP(6/7)37:

IP(7/7)38:

39

:,ex: .

39

&(1/8)40IPSPF

&(2/8)41IP:MSIP

&(3/8)42DNS

SPF Email Address

&(4/8)43

SPF:MSTXT

&(5/8)44: SPF IP

IP:MSIP

&(6/8)45

DKIM

&(7/8)46DKIM:MS DKIM(DomainKeys Identified Mail)

&(8/8)47

IP

48:LOGO

LOGOURL

LOGO

48

(1/4)49

1:

49

(2/4)502:

50

(3/4)513:

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(4/4)524:

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53Mail ServerMail Gateway

53

-541:

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-552: ,

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-563:

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Q & A

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