我有两台虚拟机，都安装了freebsd 10/i386/带有通用内核（主机是CentOS 6.5 x86-64，使用KVM）
名为Freetest0的第一台虚拟机，第二个是Freetest1
freetest0 = freebsd 10/i386/if是vtnet2 192.168.6.100freetest1 = freebsd 10/i386/if是vtnet2 192.168.6.110
我想测试freetest之间的速度。但是，问题是他们无法通过SCTP连接。TCP和UDP很好。
无论我使用IPERF3（带有SCTP支持）和NetPerfMeter，它们都无法通过SCTP连接。
#the server is freetest1
root@freetest1:~ # netstat -an -f inet
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp46 0 0 *.9000 *.* LISTEN
tcp4 0 0 192.168.0.110.22 192.168.0.1.39754 ESTABLISHED
tcp4 0 0 192.168.0.110.22 192.168.0.1.39752 ESTABLISHED
tcp4 0 0 127.0.0.1.25 *.* LISTEN
tcp4 0 0 *.22 *.* LISTEN
udp46 0 0 *.9000 *.*
udp4 0 0 *.514 *.*
Active SCTP associations (including servers)
Proto Type Local Address Foreign Address (state)
sctp46 1to1 fe80::5054:ff:fe.9000 LISTEN
192.168.8.110.9000
fe80::5054:ff:fe.9000
192.168.6.110.9000
fe80::5054:ff:fe.9000
192.168.0.110.9000
127.0.0.1.9000
fe80::1.9000
::1.9000
sctp46 1toN fe80::5054:ff:fe.9001 LISTEN
192.168.8.110.9001
fe80::5054:ff:fe.9001
192.168.6.110.9001
fe80::5054:ff:fe.9001
192.168.0.110.9001
127.0.0.1.9001
fe80::1.9001
::1.9001
root@freetest0:~ # netperfmeter 192.168.6.110:9000
Network Performance Meter - Version 1.0
---------------------------------------
Active Mode:
- Measurement ID = 4bc75bae
- Remote Address = 192.168.6.110:9000
- Control Address = 192.168.6.110:9001 - connecting ...
#<cannot get connected>
root@freetest0:~ # tcpdump -i vtnet2
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on vtnet2, link-type EN10MB (Ethernet), capture size 65535 bytes
14:11:03.839031 IP 192.168.6.100.55228 > 192.168.6.110.5201: Flags [S], seq 1318388212, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val 2652085 ecr 0], length 0
14:11:03.868787 IP 192.168.6.110.5201 > 192.168.6.100.55228: Flags [R.], seq 0, ack 1318388213, win 0, length 0
14:11:35.235362 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:38.256378 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:40.256418 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:44.256099 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:52.254442 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
root@freetest1:~ # tcpdump -i vtnet2
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on vtnet2, link-type EN10MB (Ethernet), capture size 65535 bytes
14:11:35.979349 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:39.000411 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:41.000495 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:45.000116 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
14:11:52.998491 IP 192.168.6.100.52018 > 192.168.6.110.9001: sctp (1) [INIT] [init tag: 3995201801] [rwnd: 1864135] [OS: 10] [MIS: 2048] [init TSN: 332259025]
答案是分组分析后的校验和错误。