背景:
我們公司內(nèi)網(wǎng)與機(jī)房服務(wù)器為了實(shí)現(xiàn)用內(nèi)網(wǎng)IP通信的功能,故使用了linux的IP gre隧道的方式。使得公司內(nèi)部可以直接通過路由直連的方式訪問機(jī)房服務(wù)器。
拓?fù)鋱D如下:
注:拓?fù)渲械耐饩W(wǎng)IP為虛構(gòu)的IP。
可以看到,公司和機(jī)房的服務(wù)器上各有一個(gè)內(nèi)網(wǎng)IP和外部IP。gre隧道的原理就是把兩臺(tái)服務(wù)器的外網(wǎng)IP進(jìn)行綁定,在兩個(gè)外網(wǎng)IP直接建立一條隧道tunnel2。tunnel2對(duì)服務(wù)器看來,就像一個(gè)網(wǎng)口,直連著隧道的另一邊。
這里給tunnel配置一個(gè)新的IP段:172.16.33.1/2
具體配置:
218.188.152.11:
1 2 3 4 5 6 7 8 9 10 11 | 開啟路由轉(zhuǎn)發(fā),加載gre協(xié)議模塊 # echo 1 > /proc/sys/net/ipv4/ip_forward # modprobe ip_gre 創(chuàng)建隧道tunnel2,添加一虛擬網(wǎng)段172.16.33.0 /24 # ip tunnel add tunnel2 mode gre local 218.188.152.11 remote 144.22.1.176 ttl 255 dev eth1 # ip addr add 172.16.33.2 dev tunnel2 peer 172.16.33.1/32 # ip link set dev tunnel2 up 添加一條路由到通過隧道到機(jī)房內(nèi)網(wǎng)的路由 # ip route add 10.65.3.0/24 dev tunnel2 |
144.22.1.176:
1 2 3 4 5 6 7 8 9 10 11 | 開啟路由轉(zhuǎn)發(fā),加載gre協(xié)議模塊 # echo 1 > /proc/sys/net/ipv4/ip_forward # modprobe ip_gre 創(chuàng)建隧道tunnel2,添加一虛擬網(wǎng)段172.16.33.0 /24 # ip tunnel add tunnel2 mode gre local 144.22.1.176 remote 218.188.152.11 ttl 255 dev em1 # ip addr add 172.16.33.1 dev tunnel2 peer 172.16.33.2/32 # ip link set dev tunnel2 up 添加一條路由到通過隧道到公司內(nèi)網(wǎng)的路由 # ip route add 192.168.1.0/24 dev tunnel2 |
查看路由
218.188.152.11:
1 2 3 4 5 6 7 | # netstat -nr Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 172.16.33.1 0.0.0.0 255.255.255.255 UH 0 0 0 tunnel2 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.65.3.0 0.0.0.0 255.255.255.0 U 0 0 0 tunnel2 0.0.0.0 xx.xx.xx.xx 0.0.0.0 UG 0 0 0 eth0 |
內(nèi)網(wǎng)服務(wù)器多了172.16.33.1,10.65.3.0/24的兩條路由,網(wǎng)關(guān)為gre隧道,通過隧道到達(dá)機(jī)房服務(wù)器。
144.22.1.176:
1 2 3 4 5 6 7 | # netstat -nr Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 172.16.33.2 0.0.0.0 255.255.255.255 UH 0 0 0 tunnel2 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 tunnel2 10.65.3.0 0.0.0.0 255.255.255.0 U 0 0 0 em2 0.0.0.0 xx.xx.xx.xx 0.0.0.0 UG 0 0 0 em1 |
機(jī)房服務(wù)器多了172.16.33.2,192.168.1.0/24的兩條路由,網(wǎng)關(guān)為gre隧道,通過隧道到達(dá)機(jī)房服務(wù)器。
測(cè)試網(wǎng)絡(luò)連通:
218.188.152.11:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # ping 172.16.33.2 PING 172.16.33.2 (172.16.33.2) 56(84) bytes of data. 64 bytes from 172.16.33.2: icmp_seq=1 ttl=64 time =0.048 ms 64 bytes from 172.16.33.2: icmp_seq=2 ttl=64 time =0.059 ms --- 172.16.33.2 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1021ms rtt min /avg/max/mdev = 0.048 /0 .053 /0 .059 /0 .009 ms # ping 10.65.3.194 PING 10.65.3.194 (10.65.3.194) 56(84) bytes of data. 64 bytes from 10.65.3.194: icmp_seq=1 ttl=64 time =7.96 ms 64 bytes from 10.65.3.194: icmp_seq=2 ttl=64 time =7.63 ms --- 10.65.3.194 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1100ms rtt min /avg/max/mdev = 7.638 /7 .799 /7 .960 /0 .161 ms |
公司服務(wù)器可以直接ping通對(duì)端機(jī)房服務(wù)器的gre ip以及內(nèi)網(wǎng)IP。
144.22.1.176:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # ping 172.16.33.1 PING 172.16.33.1 (172.16.33.1) 56(84) bytes of data. 64 bytes from 172.16.33.1: icmp_seq=1 ttl=64 time =0.018 ms 64 bytes from 172.16.33.1: icmp_seq=2 ttl=64 time =0.016 ms --- 172.16.33.1 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1274ms rtt min /avg/max/mdev = 0.016 /0 .017 /0 .018 /0 .001 ms # ping 192.168.1.254 PING 192.168.1.254 (192.168.1.254) 56(84) bytes of data. 64 bytes from 192.168.1.254: icmp_seq=1 ttl=64 time =7.81 ms 64 bytes from 192.168.1.254: icmp_seq=2 ttl=64 time =7.97 ms --- 192.168.1.254 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1232ms rtt min /avg/max/mdev = 7.810 /7 .894 /7 .978 /0 .084 ms |
反過來,機(jī)房服務(wù)器也可以直接ping通對(duì)端公司服務(wù)器的gre ip以及內(nèi)網(wǎng)IP。
本文出自 “扮演上帝的小丑” 博客,請(qǐng)務(wù)必保留此出處http://icenycmh.blog.51cto.com/4077647/1932232
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