ssh卡在debug1: SSH2_MSG_KEXINIT sent解决方法

最新推荐文章于 2023-02-01 17:37:08 发布
原创 最新推荐文章于 2023-02-01 17:37:08 发布 · 1.5w 阅读 · 2 ·
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#ssh卡住 #SSH2_MSG_KEXINIT #ssh hang

本文介绍了一种解决SSH连接过程中出现的特定错误的方法。当主机间的SSH连接卡在debug1:SSH2_MSG_KEXINITsent阶段时，可以通过调整网络接口的MTU值来解决。该问题通常由IPv4与GRE报头结构差异导致的数据包处理错误引起。

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现象：主机间互通正常且可以判断对方ssh端口是开放的，但是用ssh xxx.xxx.xxx.xxx -v这种方式连接的时候会卡在debug1: SSH2_MSG_KEXINIT sent这步

解决方法：echo "1454" > /sys/class/net/eth0/mtu

原因：详情参考http://techbackground.blogspot.com/2013/06/path-mtu-discovery-and-gre.html   简单解释就是IPV4报头与GRE报头结构不同，导致GRE数据包最大内容载荷只有1454，默认mtu如果是1500的话，就会有46字节的内容无法处理导致错误


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