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  • 1.  ssh host to guest : packet_write_wait

    Posted Nov 08, 2018 05:05 AM

    I have an odd networking issue. I am running MacOS 10.14 and Fusion 11 Pro.

    I have two mac’s running fusion, I have a ubuntu server vm on each mac. Separate installs. Both using bridged networking. Both VM’s have an ip from the router. DHCP lease is set to 5 weeks.

    The following SSH connections work as expected:

    Mac_host_1 -> Mac_host_2

    Mac_host_1 -> VM on mac_host_2

    Mac_host_2 -> VM on Mac_host_1

    Vm on mac_host_1 -> vm on mac_host_2

    Mac_host_1 -> any host on the internet

    Mac_host_2 -> any host on the internet

    The following suffers from odd behaviour of the following error “packet_write_wait: Connection to x: Broken Pipe”

    Mac_host_1 -> vm on mac_host_1

    Mac_host_2 -> vm on mac_host_2

    As an additional test, I installed a second VM on both mac hosts and ssh’ed between them, the same error

    Vm1 on mac_host_1 -> vm2 on mac_host_1

    Vm1 on mac_host_2 -> vm2 on mac_host_2

    I am completely confused by this, tcpdump does not show anything when the connection drops, it’s like the system did not see it, the logs I have found do not show anything relating to dropped network.

    The other very odd thing is, the error appears 1m 55s after ssh'ing to the machine, which i don't get either

    SSH keep a live and timeout settings have been tried with no effect.

    So the issue is SSH’ing from host machine to vm on host machine using a lan ip

    I am out of ideas


  • 2.  RE: ssh host to guest : packet_write_wait

    Posted Nov 12, 2018 03:37 AM

    Because this is the top result on duckduckgo, I created an account and wanted to help.

    Add this to the /etc/ssh/ssh_config your client computer:

    IPQoS throughput

    Hope this helps