ssh2 openssh

ssh -v

查看一下两台机器的版本是否类似，有可能出现的情况是一台机器采用的openssh，而另外一台机器采用的SSH2，其实openssh和ssh2是两回事，公钥格式也不相同。

SSH2的公钥写法是~/.ssh2/authorization



Key xxx.xxx

xxx.xxx为SSH2的pubkey文件名。

如果想从openssh转SSH2可以使用命令：



ssh-keygen -e -f ~/.ssh/id_dsa.pub > ~/.ssh/id_dsa_ssh2.pub

从SSH2转openssh可以使用命令：



ssh-keygen -i -f ~/.ssh/id_dsa_1024_a.pub > ~/.ssh/id_dsa_1024_a_openssh.pub

其实SSH的种类很多，查了下资料有如下解释：

SSH
    A generic term referring to SSH protocols or software products.
SSH-1
    The SSH protocol, Version 1. This protocol went through several
    revisions, of which 1.3 and 1.5 are the best known, and we will
    write SSH-1.3 and SSH-1.5 should the distinction be necessary.
SSH-2
    The SSH protocol, Version 2, as defined by several draft standards
    documents of the IETF SECSH working group.
SSH1
    Tatu Ylönen's software implementing the SSH-1 protocol; the original
    SSH. Now distributed and maintained (minimally) by SSH
    Communications Security, Inc.
SSH2
    The "SSH Secure Shell" product from SSH Communications Security, Inc.
    This is a commercial SSH-2 protocol implementation, though it is
    licensed free of charge in some circumstances.
ssh (all lowercase letters)
    A client program included in SSH1, SSH2, OpenSSH, F-Secure SSH, and
    other products, for running secure terminal sessions and remote
    commands. In SSH1 and SSH2, it is also named ssh1/ssh2, respectively.
OpenSSH
    The product OpenSSH from the OpenBSD project,
    which implements both the SSH-1 and SSH-2 protocols.
OpenSSH/1
    OpenSSH, referring specifically to its behavior
    when using the SSH-1 protocol.
OpenSSH/2
    OpenSSH, referring specifically to its behavior
    when using the SSH-2 protocol.