GitHub user prashanthr2 added a comment to the discussion: Internet 
connectivity not working on some hosts

Ok, this changes things a bit.  Based on your description it could be an issue 
with Ubuntu itself as CentOS works fine. Can you share below details

1. Have the Ubuntu VM running on both the hosts.  Give IP of the Ubuntu VM on 
each host and also the instance name for each Ubuntu VM
2. Output of below commands from both the hosts 
ip link show
brctl show #you may need to install bridge-utils for this
sysctl net.ipv4.conf.all.rp_filter
sysctl net.ipv4.conf.default.rp_filter
iptables -L -nv
iptables -t nat -L -n





GitHub link: 
https://github.com/apache/cloudstack/discussions/12382#discussioncomment-15445222

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