作者简介：刘敬一，盛科网络SDN交换机产品线测试主管
前言
- 关于OFTest的介绍，请戳这里
- 总的来说，就是用python写的测试Openflow协议一致性的测试套件
- 可以将OFTest扩展为测试Openflow的测试平台，例如做压力测试
常见干扰报文：IPv6报文
- 例如在测试过程中发现
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FAIL: stress_abnormal.StressAbnormal_2_3 ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/centec/workshop/oftest-new/tests-1.3/stress_abnormal.py", line 531, in runTest verify_packets(self, str(exp_pkt), [out_port2]) File "/home/centec/workshop/oftest-new/src/python/oftest/testutils.py", line 1820, in verify_packets verify_no_other_packets(test) File "/home/centec/workshop/oftest-new/src/python/oftest/testutils.py", line 1800, in verify_no_other_packets test.assertTrue(rcv_pkt == None, "Unexpected packet on port %r" % rcv_port) File "/home/centec/workshop/oftest-new/src/python/oftest/base_tests.py", line 97, in assertTrue unittest.TestCase.assertTrue(self, cond, msg) AssertionError: Unexpected packet on port 4 |
- 检查ethx，发现eth4有ipv6设置，port flapping的时候会自行发出报文干扰抓包
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centec@centec-28:~/workshop/oftest-new$ sudo ifconfig eth4 eth4 Link encap:Ethernet HWaddr 00:10:18:4a:c6:ac inet6 addr: fe80::210:18ff:fe4a:c6ac/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4825 errors:0 dropped:0 overruns:0 frame:0 TX packets:178235 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1109308 (1.1 MB) TX bytes:33826306 (33.8 MB) |
- 需要关掉eth4的ipv6,下面是ubuntu的解决方法，在/etc/sysctl.conf 加入下面内容
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net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 net.ipv6.conf.eth0.disable_ipv6 = 1 |
- syctl并查看eth4,发现已经没有ipv6的配置了
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centec@centec-28:~/workshop/oftest-new$ sudo sysctl -p net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 net.ipv6.conf.eth4.disable_ipv6 = 1 centec@centec-28:~/workshop/oftest-new$ centec@centec-28:~/workshop/oftest-new$ centec@centec-28:~/workshop/oftest-new$ ifconfig eth4 eth4 Link encap:Ethernet HWaddr 00:10:18:4a:c6:ac UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4825 errors:0 dropped:0 overruns:0 frame:0 TX packets:178394 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1109308 (1.1 MB) TX bytes:33856048 (33.8 MB) centec@centec-28:~/workshop/oftest-new$ |
常见干扰报文：DHCP报文
- tcpdump发现
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centec@centec-28:~/workshop/oftest-new$ sudo tcpdump -i eth3 -eXXXX tcpdump: WARNING: eth3: no IPv4 address assigned tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth3, link-type EN10MB (Ethernet), capture size 65535 bytes 01:37:25.602294 00:10:18:4a:c6:ae (oui Unknown) > Broadcast, ethertype IPv4 (0x0800), length 342: 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:10:18:4a:c6:ae (oui Unknown), length 300 0x0000: ffff ffff ffff 0010 184a c6ae 0800 4510 .........J....E. 0x0010: 0148 0000 0000 8011 3996 0000 0000 ffff .H......9....... 0x0020: ffff 0044 0043 0134 2af1 0101 0600 a326 ...D.C.4*......& 0x0030: bd78 0023 0000 0000 0000 0000 0000 0000 .x.#............ 0x0040: 0000 0000 0000 0010 184a c6ae 0000 0000 .........J...... 0x0050: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0060: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0070: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0080: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0090: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00a0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00b0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00c0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00d0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00e0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00f0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0100: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0110: 0000 0000 0000 6382 5363 3501 010c 0963 ......c.Sc5....c 0x0120: 656e 7465 632d 3238 3712 011c 0203 0f06 entec-287....... 0x0130: 770c 2c2f 1a79 2a79 f921 fc2a ff00 0000 w.,/.y*y.!.*.... 0x0140: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0150: 0000 0000 0000 ...... |
- 该报文会干扰OFTest的测试，参数Unexpected packet的错误
- 如果暂不需要DHCP，就把dhcp-client卸载掉
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centec@centec-28:/etc/default$ sudo apt-get remove isc-dhcp-client isc-dhcp-common |
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