业务拓扑分析

1,打开60的cacti找到甘肃铁通电信2如下图所示:

2,打开220cacti找到NC3560如下列图示:

3,通过以上信息画出用户甘肃铁通电信2拓扑图如下:

4,登陆220服务器―>登陆nc3560这台交换机

[root@SERV89 www]# telnet nc3560

Pwd:ctcnc

Jiangxi_Gansu_B01>enable

Password:ctcnc

5,查看该交换机运行着的配置信息

Jiangxi_Gansu_B01#showrunning-config    

interface GigabitEthernet0/5

//该口连接的是正在使用的NAT服务器:192.168.138.2的eth1口

description To GSCTT_SER eth1

switchport access vlan 101

switchport mode access

load-interval 30

!

interface GigabitEthernet0/6

//该口连接的是正在使用的NAT服务器:192.168.138.2的eth0口

description To GSCTT_SER eth0 ip:192.168.138.2

no switchport

ip address 192.168.138.1 255.255.255.0

//G0/6的IP地址

load-interval 30

!

interfaceGigabitEthernet0/7

//该口连接的是备用是NAT服务器:192.168.139.2的eth0口

description To backup-SER eth0 ip:192.168.139.2

switchport access vlan 140

switchport trunk encapsulation dot1q

switchport trunk native vlan 140

switchport trunk allowed vlan 138-140

switchport mode trunk

load-interval 30

duplex full

speed 1000

!

interface GigabitEthernet0/8

//该口连接的是备用是NAT服务器:192.168.139.2的eth1口

description To backup-SER eth1

switchport trunk encapsulation dot1q

switchport trunk native vlan 100

switchport trunk allowed vlan 100,101

switchport mode trunk

load-interval 30

shutdown

duplex full

speed 1000

!

interface GigabitEthernet0/25

//该口连接的是叫江西电信的资源,资源连接因特网

//电信和联通是资源,铁通移动属于用户

no switchport

ip address 59.63.255.50 255.255.255.252 secondary

ip address 59.53.48.114 255.255.255.252

load-interval 30

!

interface GigabitEthernet0/26

//该口连接的是叫甘肃铁通的用户。属于vlan101

description To GSCTT

switchport access vlan 101

switchport mode access

load-interval 30

speed nonegotiate

!

ip classless

ip route 0.0.0.0 0.0.0.0 59.63.255.49

ip route 1.19.8.0 255.255.248.0 Null0

ip route 1.92.0.0 255.255.240.0 Null0

ip route 59.53.52.0 255.255.252.0 Null0

ip route 59.53.52.0 255.255.255.0 Null0

ip route 59.53.53.0 255.255.255.0 Null0

ip route 59.53.54.0 255.255.255.0192.168.139.2

ip route 59.53.54.128 255.255.255.128192.168.138.2

ip route 59.53.55.0 255.255.255.0192.168.138.2

ip route 59.63.160.0 255.255.224.0 Null0name JiangxiTele02

ip route 59.63.192.0 255.255.192.0 Null0name JiangxiTele03

ip route 59.63.224.0 255.255.224.0 Null0name NNGuangD_pool

ip route 219.234.80.220 255.255.255.25559.63.255.49

ip route 219.238.159.162 255.255.255.25559.63.255.49

ip route 219.238.159.180 255.255.255.25559.63.255.49

6,查看甘肃铁通用户连接的G0/26口的信息属于vlan101

Jiangxi_Gansu_B01#show running-configinterface g0/26

Building configuration...


Current configuration : 148 bytes

!

interface GigabitEthernet0/26

description To GSCTT

switchport access vlan 101

switchport mode access

load-interval 30

speed nonegotiate

end

7,登陆图示有流量的服务器01:192.168.138.2

Jiangxi_Gansu_B01#telnet 192.168.138.2

login: admin

Password:admin

[admin@GansuBnat01 ~]$ su - root

Password: admin

7,查看192.168.138.2网卡信息

[root@GansuBnat01 ~]# ifconfig

eth0     Link encap:Ethernet  HWaddr00:30:48:33:DD:52  

        inet addr:192.168.138.2  Bcast:192.168.138.255  Mask:255.255.255.0

        UP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1

        RX packets:3845735717 errors:0 dropped:39173111 overruns:0 frame:0

        TX packets:4252478377 errors:0 dropped:0 overruns:0 carrier:0

         collisions:0 txqueuelen:1000

        RX bytes:701526308 (669.0 MiB)  TXbytes:3804799767 (3.5 GiB)

        Memory:d8000000-d8020000


eth1     Link encap:Ethernet  HWaddr00:30:48:33:DD:53  

        inet addr:59.53.52.1  Bcast:59.53.52.3  Mask:255.255.255.252

        UP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1

        RX packets:4136813440 errors:0 dropped:21164896 overruns:0 frame:0

        TX packets:2281977231 errors:0 dropped:0 overruns:0 carrier:0

        collisions:0 txqueuelen:1000

        RX bytes:3272692444 (3.0 GiB)  TXbytes:665651294 (634.8 MiB)

        Memory:d8020000-d8040000


lo       Link encap:Local Loopback  

        inet addr:127.0.0.1 Mask:255.0.0.0

        UP LOOPBACK RUNNING MTU:16436  Metric:1

        RX packets:1842 errors:0 dropped:0 overruns:0 frame:0

        TX packets:1842 errors:0 dropped:0 overruns:0 carrier:0

        collisions:0 txqueuelen:0

        RX bytes:266151 (259.9 KiB)  TXbytes:266151 (259.9 KiB)

8,查看192.168.139.2NAT信息

[root@GansuBnat01 ~]# iptables -t nat-nvL

Chain PREROUTING (policy ACCEPT 9565Mpackets, 891G bytes)

pkts bytes target     prot opt in     out    source              destination        


Chain POSTROUTING (policy ACCEPT 101packets, 6116 bytes)

pkts bytes target     prot opt in     out    source               destination        

  0     0 RETURN     all --  *      eth0   116.245.254.0/24    0.0.0.0/0          

4099M 306G SNAT       all  -- *      eth0    0.0.0.0/0            0.0.0.0/0           to:59.53.54.128-59.53.54.253(地址池)

  0     0 SNAT       all --  *      eth0   0.0.0.0/0           0.0.0.0/0          to:59.53.55.6-59.53.55.254


Chain OUTPUT (policy ACCEPT 25118packets, 1620K bytes)

pkts bytes target     prot opt in     out    source              destination        


9,查看192.168.139.2  网卡接口信息

[root@GansuBnat01 ~]# ip address ls

1: lo: <LOOPBACK,UP,LOWER_UP> mtu16436 qdisc noqueue

  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

  inet 127.0.0.1/8 scope host lo

  inet 59.53.54.128/32 scope global lo

  inet 59.53.54.129/32 scope global lo

2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

  link/ether 00:30:48:33:dd:52 brd ff:ff:ff:ff:ff:ff

  inet 192.168.138.2/24 brd 192.168.138.255 scope global eth0

3: eth1:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

  link/ether 00:30:48:33:dd:53 brd ff:ff:ff:ff:ff:ff

  inet 59.53.52.1/30 brd 59.53.52.3 scope global eth1

10,通过服务器IP地址计算用户IP地址

用户甘肃铁通和交换机的0/26,0/5,以及NAT服务器的eth1同属于一个叫vlan101的VLAN

由于NAT服务器的接用户的属于vlan101的eth1的IP是59.53.52.1/30,所以用户甘肃铁通的IP地址一定是59.53.52.2/30

11,这个IP是怎么样计算的呢???

从59.53.52.1/30可以看出来该网段有4个地址可以用。因为30代表网络位占用了30位,主机位只剩下2位啦!!2位有4台主机。而在主机位0-3,4-7,8-11中,下列主机位是不能用的:0,3,4,7,8,11。可用的剩下:1,2,5,6,9,10。

12,查用户甘肃铁通的回程路由

[root@GansuBnat01 ~]#ip route ls | grep 59.53.52.2

123.81.1.96/30via 59.53.52.2 dev eth1  proto zebraequalize

123.81.160.0/19via 59.53.52.2 dev eth1  proto zebraequalize

123.81.0.0/16via 59.53.52.2 dev eth1  proto zebraequalize

13,潜规则

服务器的eth0接资源

eth1划分出不同的vlan接用户


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