Comment 6 for bug 1849221

Following the steps described on this bug, i was able to ping instance from compute in a 2+2 configuration and duplex as well. the problem seems to be related to the port 22, having the following message
#ssh -i /home/sysadmin/.ssh/id_rsa.pub cirros@192.168.101.156
Unable to negotiate with 192.168.101.156 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1.