RHEL 8 Running in VMWare Workstation Unable to Connect via SSH to Other Hosts

Environment

• Red Hat Enterprise Linux 8
• VMWare Workstation / VMware Fusion
• NAT Guest Networking

Issue

• A Red Hat Enterprise Linux 8 Beta VM running under VMWare Workstation is unable to connect via SSH to other systems even after successful authentication, resulting in this error: packet_write_wait: Connection to x.x.x.x port 22: Broken pipe.

Resolution

• Use Bridged networking
  • Switching the guest from NAT to Bridged networking eliminates this issue.
• If you'd like to keep NAT networking, add the following to your ~/.ssh/config:

Host *
    IPQoS=throughput

Root Cause

This is caused by a change made in OpenSSH 7.8, documented in the Content from www.openssh.com is not included.OpenSSH 7.8 Release Notes:

* ssh(1)/sshd(8): the default IPQoS used by ssh/sshd has changed.
   They will now use DSCP AF21 for interactive traffic and CS1 for
   bulk.  For a detailed rationale, please see the commit message: https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/readconf.c#rev1.284

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