ssh登录一些老旧设备，出现以下问题：
问题：Unable to negotiate with 192.168.xx.xx port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1
解决：-oKexAlgorithms=+diffie-hellman-group1-sha1
问题：Unable to negotiate with 192.168.xx.xx port 22: no matching host key type found. Their offer: ssh-dss
解决：-oHostKeyAlgorithms=+ssh-dss
问题：Unable to negotiate with 192.168.xx.xx port 22: no matching cipher found. Their offer: 3des-cbc
解决：-oCiphers=+3des-cbc
最后命令是这样的：
ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 -oHostKeyAlgorithms=+ssh-dss -oCiphers=+3des-cbc user@192.168.xx.xx
https://zhuanlan.zhihu.com/p/30840210
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