LB旁路部署案例
一、 需求
创新互联坚持“要么做到，要么别承诺”的工作理念，服务领域包括：
网站设计、成都网站建设、企业官网、英文网站、手机端网站、网站推广等服务，满足客户于互联网时代的
巴宜网站设计、移动媒体设计的需求，帮助企业找到有效的互联网解决方案。努力成为您成熟可靠的网络建设合作伙伴！
LB关键配置：
interface GigabitEthernet1/0/1
port link-mode route
combo enable copper
ip address 192.168.0.1 255.255.255.0
#
interface GigabitEthernet1/0/2
port link-mode route
combo enable copper
ip address 192.168.35.5 255.255.255.0
loadbalance snat-pool pool
ip range start 192.168.35.5 end 192.168.35.5
#
server-farm sf
snat-pool pool
probe t1
#
real-server rs1
ip address 192.168.1.1
port 23
weight 150
server-farm sf
#
real-server rs2
ip address 192.168.2.2
port 23
weight 120
server-farm sf
#
virtual-server vs type tcp
port 2323
virtual ip address 192.168.35.5
default server-farm sf
service enable
#
ip route-static 0.0.0.0 0 192.168.35.3
#
acl basic 2000
rule 0 permit
security-zone name Trust
import interface GigabitEthernet1/0/2
#
security-zone name DMZ
#
security-zone name Untrust
#
security-zone name Management
#
zone-pair security source Any destination Any
packet-filter 2000
#
return
五、 测试
外网主机telnet外网映射到LB的地址和端口，看是否可以访问到内部服务器
telnet 100.1.46.4 2323
Trying 100.1.46.4 ...
Press CTRL+K to abort
Connected to 100.1.46.4 ...
dis ip int brief
*down: administratively down
(s): spoofing (l): loopback
Interface Physical Protocol IP Address Description
GE0/0 down down -- --
GE0/1 up up 192.168.1.1 --
测试后可以正常访问到服务器A
退出登录后再尝试登录下，测试看是否可以轮询到另一个服务器
quit
The connection was closed by the remote host!
telnet 100.1.46.4 2323
Trying 100.1.46.4 ...
Press CTRL+K to abort
Connected to 100.1.46.4 ...
dis ip int brief
*down: administratively down
(s): spoofing (l): loopback
Interface Physical Protocol IP Address Description
GE0/0 up up 192.168.2.2 --
LB>dis real-server statistics
Slot 1:
Real server: rs1
Total connections: 7
Active connections: 0
Max connections: 1
Connections per second: 0
Max connections per second: 1
Server input: 13601 bytes
Server output: 15872 bytes
Throughput: 0 bytes/s
Inbound throughput: 0 bytes/s
Outbound throughput: 0 bytes/s
Max throughput: 3612 bytes/s
Max inbound throughput: 1359 bytes/s
Max outbound throughput: 2253 bytes/s
Received packets: 252
Sent packets: 238
Dropped packets: 0
Received requests: 0
Dropped requests: 0
Sent responses: 0
Dropped responses: 0
Connection failures: 0
Real server: rs2
Total connections: 8
Active connections: 1
Max connections: 1
Connections per second: 0
Max connections per second: 1
Server input: 15552 bytes
Server output: 17213 bytes
Throughput: 0 bytes/s
Inbound throughput: 0 bytes/s
Outbound throughput: 0 bytes/s
Max throughput: 5796 bytes/s
Max inbound throughput: 2451 bytes/s
Max outbound throughput: 3345 bytes/s
Received packets: 288
Sent packets: 264
Dropped packets: 0
Received requests: 0
Dropped requests: 0
Sent responses: 0
Dropped responses: 0
Connection failures: 0
dis virtual-server statistics
Slot 1:
Virtual server: vs
Total connections: 15
Active connections: 1
Max connections: 2
Connections per second: 0
Max connections per second: 1
Client input: 29257 bytes
Client output: 33165 bytes
Throughput: 0 bytes/s
Inbound throughput: 0 bytes/s
Outbound throughput: 0 bytes/s
Max throughput: 5796 bytes/s
Max inbound throughput: 2451 bytes/s
Max outbound throughput: 3345 bytes/s
Received packets: 542
Sent packets: 504
Dropped packets: 0
六、 注意事项
- 该拓扑图中，如果只是单纯配置服务器负载均衡，不针对外网进来的源做snat的话，是无法访问到服务器的，原因是，外网终端向LB发起访问，但是数据包回复时却是内网服务器直接给予的回应，服务器回包时，数据包到核心设备，直接按照缺省路由去做转发了，即使客户端收到数据包，由于发起和回应的地址不一致，则会认为数据包不是自己想要的，会直接丢弃
- 配置LB时，新建实服务，关联实服务组，最后在虚服务器下做关联时，设备会根据检测模板去轮询看是否和服务器可达，如果可达，将处于active状态，如果检测不可达，处于Probe-failed
网页名称：LB服务器负载均衡【旁路部署】-创新互联
转载源于：
http://cdkjz.cn/article/csgpoo.html
