【實驗拓撲】
【實驗說明】
通常情況下我們內部有多台伺服器，例如web伺服器，這些伺服器的位址不同，但承載的應用時相同的，如何讓外部訪問時實現負載均衡呢？
我們以telnet測試，r1與r6都能夠被telnet。實驗要讓r5訪問r1與r6的telnet服務時，通過nat實現負載均衡
【實驗配置】
r4：inte***ce ethernet 0/0
ip nat inside !
inte***ce serial 0/1
ip nat outside !
inte***ce serial 0/0.1
ip nat outside !
ip nat pool servers prefix-length 24 type rotary
address 10.0.0.1 10.0.0.1
address 10.0.0.6 10.0.0.6
先定義乙個pool，為內部的伺服器位址範圍
!ip access-list extended inbound_telnet
permit tcp any host 150.1.4.4 eq 23
定義允許的服務，和外部訪問內部時被轉換的位址
!ip nat inside destination list inbound_telnet pool servers
設定目的位址nat，實現負載均衡
【實驗驗證】
r4#show ip nat statistics
total active translations: 3 (2 static, 1 dynamic; 1 extended)
outside inte***ces:
serial0/0.1, serial0/1
inside inte***ces:
fastethernet0/0
hits: 480 misses: 12
cef translated packets: 492, cef punted packets: 0
expired translations: 11
-- inside destination
[id: 1] access-list inbound_telnet pool servers refcount 1
pool servers: netmask 255.255.255.0
start 10.0.0.1 end 10.0.0.1
start 10.0.0.6 end 10.0.0.6
type rotary, total addresses 2, allocated 1 (50%), misses 0
queued packets: 0
r5#telnet 150.1.4.4
trying 150.1.4.4 ... open
r1>exit 第一次連線到r1上
[connection to 150.1.4.4 closed by foreign host]
r5#telnet 150.1.4.4
trying 150.1.4.4 ... open
r6>exit 第二次連線到r6上
[connection to 150.1.4.4 closed by foreign host]
r5#
【實驗基本配置】
r1:
inter fa 0/0
ip address 10.0.0.1 255.255.255.0
no shut !
ip route 0.0.0.0 0.0.0.0 10.0.0.4
r4:
inter ethernet 0/0
ip address 10.0.0.4 255.255.255.0
no shut !
inter loopback0
ip add 150.1.4.4 255.255.255.0
ip ospf network point-to-point !
inte***ce serial 0/0
encaps frame-relay
no shutdown !
inte***ce serial 0/0.1 point-to-point
ip address 155.1.0.4 255.255.255.0
frame-relay inte***ce-dlci 405 !
inte***ce serial 0/1
no shutdown
ip address 155.1.45.4 255.255.255.0 !
router ospf 1
router-id 150.1.4.4
network 155.1.0.4 0.0.0.0 area 0
network 155.1.45.4 0.0.0.0 area 0
network 150.1.4.4 0.0.0.0 area 0 !
router bgp 1
bgp router-id 150.1.4.4
neighbor 150.1.5.5 remote-as 2
neighbor 150.1.5.5 update-source loopback0
neighbor 150.1.5.5 ebgp-multihop
r5:
inte***ce loopback0
ip address 150.1.5.5 255.255.255.0
ip ospf network point-to-point !
inte***ce serial 0/0
encapsulation frame-relay
no shut !
inte***ce serial 0/0.1 point-to-point
ip address 155.1.0.5 255.255.255.0
frame-relay inte***ce-dlci 504 !
inte***ce serial 0/1
no shutdown
clockrate 64000
ip address 155.1.45.5 255.255.255.0 !
router ospf 1
router-id 150.1.5.5
network 155.1.0.5 0.0.0.0 area 0
network 155.1.45.5 0.0.0.0 area 0
network 150.1.5.5 0.0.0.0 area 0 !
router bgp 2
bgp router-id 150.1.5.5
neighbor 150.1.4.4 remote-as 1
neighbor 150.1.4.4 update-source loopback0
neighbor 150.1.4.4 ebgp-multihop
neighbor 150.1.4.4 default-originate
r6:
inter gig 0/0
ip address 10.0.0.6 255.255.255.0
no shut !
ip route 0.0.0.0 0.0.0.0 10.0.0.4
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