ipsec

Ipsec簡介

IPSec（InternetProtocolSecurity）是安全聯網的長期方向。它通過端對端的安全性來提供主動的保護以防止專用網絡與 Internet 的***。在通信中，只有發送方和接收方纔是唯一必須瞭解 IPSec 保護的計算機。在 Windows 2000、Windows XP 和 Windows Server 2003 家族中，IPSec 提供了一種能力，以保護工作組、局域網計算機、域客戶端和服務器、分支機構（物理上爲遠程機構）、Extranet 以及漫遊客戶端之間的通信。

IPsec與其它互聯網安全協議的對比

2作用目標編輯

保護 IP 數據包的內容。

通過數據包篩選及受信任通訊的實施來防禦網絡***。

這兩個目標都是通過使用基於加密的保護服務、安全協議與動態密鑰管理來實現的。這個基礎爲專用網絡計算機、域、站點、遠程站點、Extranet 和撥號用戶之間的通信提供了既有力又靈活的保護。它甚至可以用來阻礙特定通訊類型的接收和發送。

其中以接收和發送最爲重要。

拓撲圖

配置三層交換機

<Quidway>sys

[Quidway]sys isp

[isp]vlan 10

[isp-vlan10]port e0/1

[isp-vlan10]vlan 20

[isp-vlan20]port e0/9

[isp-vlan20]vlan 30

[isp-vlan30]port e0/17

[isp-vlan30]int vlan10

[isp-Vlan-interface10]ip add 67.130.130.1 255.255.255.252

[isp-Vlan-interface10]int vlan 20

[isp-Vlan-interface20]ip add 67.130.130.5 255.255.255.252

[isp-Vlan-interface20]int vlan 30

[isp-Vlan-interface30]ip add 67.130.130.9 255.255.255.252

 

 

 

設置fw1

<H3C>sys

[H3C]sys fw1

[fw1]int eth0/0

[fw1-Ethernet0/0]ip add 192.168.3.1 24

[fw1-Ethernet0/0]loopback

[fw1-Ethernet0/0]int eth0/4

[fw1-Ethernet0/4]ip add 67.130.130.2 30

取消端口隔離

[fw1]undo insulate

添加eth0/4到untrust

[fw1]firewall zone untrust

[fw1-zone-untrust]add int eth0/4

添加eth0/0到trust

[fw1]firewall zone trust

[fw1-zone-trust]add int eth0/0

用訪問控制列表篩選

[fw1]acl number 3000 match-order auto

[fw1-acl-adv-3000]rule 10 permit ip source 192.168.3.0 0.0.0.255destination 192.168.4.0 0.0.0.255

[fw1-acl-adv-3000]rule 20 deny ip source any destination any

創建安全提議tran1

[fw1]ipsec proposal tran1

選擇管道方式

[fw1-ipsec-proposal-tran1]encapsulation-mode tunnel

選擇安全協議sep

[fw1-ipsec-proposal-tran1]transform esp

完整性校驗選md5

[fw1-ipsec-proposal-tran1]esp authentication-algorithm md5

加密算法選des

[fw1-ipsec-proposal-tran1]esp encryption-algorithm des

設置ike peer

[fw1]ike peer fw2

設置來源ip

[fw1-ike-peer-fw2]local-address 67.130.130.2  

設置目標ip                   

[fw1-ike-peer-fw2]remote-address 67.130.130.6

設置密鑰

[fw1-ike-peer-fw2]pre-shared-key 123456

注意，這個密鑰一定要記住，下面還要用到

 

isa和篩選流相結合

 

選擇動態isa

[fw1]ipsec policy policy1 10 isakmp

篩選符合3000表的流

[fw1-ipsec-policy-isakmp-policy1-10]security acl 3000

選擇符合提議tran1的

[fw1-ipsec-policy-isakmp-policy1-10]proposal tran1

選擇ike 對等體爲fw2

[fw1-ipsec-policy-isakmp-policy1-10]ike-peer fw2

進入端口eth0/4應用策略

[fw1]int eth0/4

[fw1-Ethernet0/4]ipsec policy policy1

第一條隧道已經設置好了，接着該去設置這條隧道的另一端，進入防火牆fw2

下面是第二條隧道的設置

[fw1]acl number 3001 match-order auto

[fw1-acl-adv-3001]rule permit ip source 192.168.3.0 0.0.0.255destination 192.168.5.0 0.0.0.255

[fw1-acl-adv-3001]rule deny ip source any destination any

[fw1]ipsec proposal tran2

[fw1-ipsec-proposal-tran2]encapsulation-mode tunnel

[fw1-ipsec-proposal-tran2]transform esp

[fw1-ipsec-proposal-tran2]esp authentication-algorithm md5         

[fw1-ipsec-proposal-tran2]esp encryption-algorithm des

[fw1]ike peer fw3

[fw1-ike-peer-fw3]local-address 67.130.130.2

[fw1-ike-peer-fw3]remote-address 67.130.130.10

[fw1-ike-peer-fw3]pre-shared-key 654321

[fw1]acl number 3001 match-order auto

[fw1-acl-adv-3000]undo rule 20

 

設置fw2

 

<H3C>sys

[H3C]sys fw2

[fw2]int eth0/0

[fw2-Ethernet0/0]ip add 192.168.4.1 24

[fw2-Ethernet0/0]loopback

[fw2-Ethernet0/0]int eth0/4

[fw2-Ethernet0/4]ip add 67.130.130.6 30

[fw2]undo insulate

[fw2]firewall packet-filter default permit

[fw2]firewall zone trust

[fw2-zone-trust]add interface eth0/0

[fw2]firewall zone untrust

[fw2-zone-untrust]add int eth0/4

[fw2]ip route-static 0.0.0.0 0 67.130.130.5

[fw2]acl number 3000 match-order auto

[fw2-acl-adv-3000]rule 10 permit ip source 192.168.4.0 0.0.0.255destination 192.168.3.0 0.0.0.255

[fw2-acl-adv-3000]rule 20 deny ip source any destination any

[fw2]ipsec proposal tran1

[fw2-ipsec-proposal-tran1]encapsulation-mode tunnel

[fw2-ipsec-proposal-tran1]esp authentication-algorithm md5                     

[fw2-ipsec-proposal-tran1]esp encryption-algorithm des

[fw2]ike peer fw1

[fw2-ike-peer-fw1]local-address 67.130.130.6

[fw2-ike-peer-fw1]remote-address 67.130.130.2

[fw2-ike-peer-fw1]pre-shared-key 123456

這個密鑰要和另外一端的一樣

[fw2]ipsec policy policy1 10 isakmp

[fw2-ipsec-policy-isakmp-policy1-10]security acl 3000

[fw2-ipsec-policy-isakmp-policy1-10]proposal tran1

[fw2-ipsec-policy-isakmp-policy1-10]ike-peer fw1

[fw2]int eth0/4

[fw2-Ethernet0/4]ipsec policy policy1

配置fw3

 

<H3C>sys

[H3C]sys fw3

[fw3]int eth0/0

[fw3-Ethernet0/0]ip add 192.168.5.1 24

[fw3-Ethernet0/0]loopback

[fw3-Ethernet0/0]int eth0/4

[fw3-Ethernet0/4]ip add 67.130.130.10 30

[fw3]undo insulate

[fw3]firewall zone untrust

[fw3-zone-untrust]add int eth0/4

[fw3]firewall zone trust

[fw3-zone-trust]add int eth0/0

[fw3]ip route-static 0.0.0.0 0 67.130.130.9

[fw3]acl number 3001 match-order auto

[fw3-acl-adv-3001]rule 10 permit ip source 192.168.5.0 0.0.0.255destination 192.168.3.0 0.0.0.255

[fw3-acl-adv-3001]rule 20 deny ip source any destination any

[fw3]ipsec proposal tran2      

[fw3-ipsec-proposal-tran2]encapsulation-mode tunnel

[fw3-ipsec-proposal-tran2]transform esp

[fw3-ipsec-proposal-tran2]esp authentication-algorithm md5

[fw3-ipsec-proposal-tran2]esp encryption-algorithm des

[fw3]ike peer fw1

[fw3-ike-peer-fw1]local-address 67.130.130.10

[fw3-ike-peer-fw1]remote-address 67.130.130.2

[fw3-ike-peer-fw1]pre-shared-key 654321

[fw3]ipsec policy policy1 10 isakmp

[fw3-ipsec-policy-isakmp-policy1-10]security acl 3001

[fw3-ipsec-policy-isakmp-policy1-10]tracert tran2

[fw3-ipsec-policy-isakmp-policy1-10]ike-peer fw1

[fw3]int eth0/4

[fw3-Ethernet0/4]ipsec policy policy1