Warning: Unable to send packet: Error with PF_PACKET send() [11]: Message too long (errno = 90)
今天在使用tcpreplay重放流量时，发现有的数据包没有发送成功：
Warning: Unable to send packet: Error with PF_PACKET send() [215]: Message too long (errno = 90)
Warning: Unable to send packet: Error with PF_PACKET send() [216]: Message too long (errno = 90)
Warning: Unable to send packet: Error with PF_PACKET send() [218]: Message too long (errno = 90)
Warning: Unable to send packet: Error with PF_PACKET send() [219]: Message too long (errno = 90)
Warning: Unable to send packet: Error with PF_PACKET send() [234]: Message too long (errno = 90)
Actual: 459 packets (386911 bytes) sent in 0.03 seconds. Rated: 12897033.0 bps, 98.40 Mbps, 15300.00 pps
Statistics for network device: eth0
Attempted packets: 235
Successful packets: 217
Failed packets: 18
Retried packets (ENOBUFS): 0
Retried packets (EAGAIN): 0
Statistics for network device: eth0
Attempted packets: 224
Successful packets: 224
Failed packets: 0
Retried packets (ENOBUFS): 0
Retried packets (EAGAIN): 0
从错误提示看出，应该是数据包太大了。我查看了一下发送的数据包：
10:20:39.019199 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 323602:326522, ack 1978, win 31, length 2920
10:20:39.019298 IP xyw-Eliot.local.53720 > xyw-Eliot.local.http: Flags [.], ack 326522, win 543, length 0
10:20:39.047511 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 326522:329442, ack 1978, win 31, length 2920
10:20:39.047559 IP xyw-Eliot.local.53720 > xyw-Eliot.local.http: Flags [.], ack 329442, win 543, length 0
10:20:39.047665 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 329442:330902, ack 1978, win 31, length 1460
10:20:39.075783 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 330902:333822, ack 1978, win 31, length 2920
10:20:39.075824 IP xyw-Eliot.local.53720 > xyw-Eliot.local.http: Flags [.], ack 333822, win 543, length 0
10:20:39.104001 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 333822:336742, ack 1978, win 31, length 2920
10:20:39.104049 IP xyw-Eliot.local.53720 > xyw-Eliot.local.http: Flags [.], ack 336742, win 543, length 0
10:20:39.104322 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 336742:338202, ack 1978, win 31, length 1460
10:20:39.132219 IP xyw-Eliot.local.http > xyw-Eliot.local.53720: Flags [.], seq 338202:339662, ack 1978, win 31, length 1460
发现数据包长度已经超过1500（MTU默认为1500），所以问题的解决方法是修改系统的MTU值。
先说一下我的系统环境：ubuntu 12.04
linux系统修改MTU的方法比较简单，一个命令即可：
sudo ifconfig eth0 mtu 3000
这是将网卡eth0的MTU值设置为3000,这样再重新放包，发现数据包被全部发送：
sending out eth0 eth0
processing file: tcp_rewrite.pcap
Actual: 459 packets (386911 bytes) sent in 0.04 seconds. Rated: 9672775.0 bps, 73.80 Mbps, 11475.00 pps
Statistics for network device: eth0
Attempted packets: 235
Successful packets: 235
Failed packets: 0
Retried packets (ENOBUFS): 0
Retried packets (EAGAIN): 0
Statistics for network device: eth0
Attempted packets: 224
Successful packets: 224
Failed packets: 0
Retried packets (ENOBUFS): 0
Retried packets (EAGAIN): 0
本文为Eliot原创，转载请注明出处：
http://blog.csdn.net/xyw_blog/article/details/10741919
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