ExtremeSwitching (EXOS)

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How to connect via ssh from router cisco

  • 1.  How to connect via ssh from router cisco

    Posted 10-18-2017 13:15
    Hello All,

    My ISP needs connect with switches extreme by SSH from rouert cisco since we want to maintain this connection as contingency.

    These are logs the cisco router

    RTT_BF_HC_ENVIGADO_PPAL#ssh 1.1.1.1

    [Connection to 10.128.35.4 aborted: error status 0]
    RTT_BF_HC_ENVIGADO_PPAL#
    Sep 8 16:10:50.648: SSH CLIENT0: protocol version id is - SSH-2.0-4.1.2 SSH Secure Shell Toolkit
    Sep 8 16:10:50.648: SSH CLIENT0: sent protocol version id SSH-2.0-Cisco-1.25
    Sep 8 16:10:50.648: SSH2 CLIENT 0: send:packet of length 344 (length also includes padlen of 5)
    Sep 8 16:10:50.648: SSH2 CLIENT 0: SSH2_MSG_KEXINIT sent
    Sep 8 16:10:50.652: SSH2 CLIENT 0: ssh_receive: 424 bytes received
    Sep 8 16:10:50.652: SSH2 CLIENT 0: input: total packet length of 424 bytes
    Sep 8 16:10:50.652: SSH2 CLIENT 0: partial packet length(block size)8 bytes,needed 416 bytes,
    maclen 0
    Sep 8 16:10:50.652: SSH2 CLIENT 0: input: padlength 8 bytes
    Sep 8 16:10:50.652: SSH2 CLIENT 0: SSH2_MSG_KEXINIT received
    Sep 8 16:10:50.652: SSH2:kex: server->client enc:aes128-cbc mac:hmac-sha1
    Sep 8 16:10:50.652: SSH2:kex: client->server enc:aes128-cbc mac:hmac-sha1
    Sep 8 16:10:50.652: SSH2 CLIENT 0: hostkey algo not supported: client ssh-rsa, server ssh-dss
    Sep 8 16:10:50.652: SSH CLIENT0: Session disconnected - error 0x00

    RTT_BF_HC_ENVIGADO_PPAL#ssh 1.1.1.1

    [Connection to 10.128.35.4 aborted: error status 0]
    RTT_BF_HC_ENVIGADO_PPAL#ssh 1.1.1.1
    Sep 8 15:54:52.497: SSH2 CLIENT 0: hostkey algo not supported: client ssh-rsa, ho log



  • 2.  RE: How to connect via ssh from router cisco

    Posted 10-18-2017 15:03
    Hi,

    I think the problem is here -> SSH2 CLIENT 0: hostkey algo not supported: client ssh-rsa, server ssh-dss

    What is the switch model and what firmware you have on it?

    --
    Jarek



  • 3.  RE: How to connect via ssh from router cisco

    Posted 10-18-2017 15:26
    Hello Jarek,

    I have extreme switches X250, X450 with version 15.3.5.2 patch1-10 at switches X440, 460, 670 and BD8800 with a version 16.1.4.2 patch1-7.

    Regards.


  • 4.  RE: How to connect via ssh from router cisco

    Posted 10-18-2017 16:33
    The problem is that on your cisco device you have newer ssh implementation than on EXOS.
    And in newer version ssh-dss keys has been disabled.

    I don't know if there is any change, but the upgrade was in 21.1 and 16.2

    Please see -> https://community.extremenetworks.com/extreme/topics/with-new-openssh-client-7-1-no-normal-ssh-login...

    Could you write, what do you want to achieve?
    Maybe we can find another way/idea to help you?

    --
    Jarek