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Posted to users@cloudstack.apache.org by "skatta33 (via GitHub)" <gi...@apache.org> on 2026/01/09 09:14:06 UTC
[D] Unable to ping to external network from cloud stack system VM and virtual router [cloudstack]
GitHub user skatta33 created a discussion: Unable to ping to external network from cloud stack system VM and virtual router
Hi ,
Good afternoon to everybody.
I have installed our Apache cloud stack on redhat 9.7 servers using basic network setup and configured cloudbr0 on mgt and kvm without any problem.I was able to ping 8.8.8.8 and 192.168.1.1 from both mgt and kvm without any problem.
I have given external dns 8.8.8.8 and gateway ip was 192.168.1.1 and netmask was 255.255.255.0 for one physical network.
I was able to ping kvm and mgt and vm ips and 0.0.0.0 from our systemvms and virtual router without any problem but it was not pinging 8.8.8.8 or 192.168.1.1 from both systemvms and virtual router and instance of debian linux.
I have configured cloudbr0 as traffic lable for guest,mgt,public and storage.
Please advice me.
Thank you,
Srinivas,
India,
skatta33@gmail.com
GitHub link: https://github.com/apache/cloudstack/discussions/12396
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Re: [D] Unable to ping to external network from cloud stack system VM and virtual router [cloudstack]
Posted by "skatta33 (via GitHub)" <gi...@apache.org>.
GitHub user skatta33 closed a discussion: Unable to ping to external network from cloud stack system VM and virtual router
Hi ,
Good afternoon to everybody.
I have installed our Apache cloud stack on redhat 9.7 servers using basic network setup and configured cloudbr0 on mgt and kvm without any problem.I was able to ping 8.8.8.8 and 192.168.1.1 from both mgt and kvm without any problem.
I have given external dns 8.8.8.8 and gateway ip was 192.168.1.1 and netmask was 255.255.255.0 for one physical network.
I was able to ping kvm and mgt and vm ips and 0.0.0.0 from our systemvms and virtual router without any problem but it was not pinging 8.8.8.8 or 192.168.1.1 from both systemvms and virtual router and instance of debian linux.
I have configured cloudbr0 as traffic lable for guest,mgt,public and storage.
Please advice me.
Thank you,
Srinivas,
India,
skatta33@gmail.com
GitHub link: https://github.com/apache/cloudstack/discussions/12396
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Re: [D] Unable to ping to external network from cloud stack system VM and virtual router [cloudstack]
Posted by "skatta33 (via GitHub)" <gi...@apache.org>.
GitHub user skatta33 added a comment to the discussion: Unable to ping to external network from cloud stack system VM and virtual router
Prasanath,
Good evening.
Thanks for all your help.
Now,I was pinging to external network from vms and vr without any problem after enabled ipforward to 1 on KVM.
I have a question here that Why I was not pinging to default gateway 192.168.1.1 from vms ?
Right now everything was working fine except above my query.
Thanks for all your help.
Srinivas
GitHub link: https://github.com/apache/cloudstack/discussions/12396#discussioncomment-15462881
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Re: [D] Unable to ping to external network from cloud stack system VM and virtual router [cloudstack]
Posted by "boring-cyborg[bot] (via GitHub)" <gi...@apache.org>.
GitHub user boring-cyborg[bot] added a comment to the discussion: Unable to ping to external network from cloud stack system VM and virtual router
Thanks for opening your first issue here! Be sure to follow the issue template!
GitHub link: https://github.com/apache/cloudstack/discussions/12396#discussioncomment-15452794
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Re: [D] Unable to ping to external network from cloud stack system VM and virtual router [cloudstack]
Posted by "prashanthr2 (via GitHub)" <gi...@apache.org>.
GitHub user prashanthr2 added a comment to the discussion: Unable to ping to external network from cloud stack system VM and virtual router
@skatta33 Glad to know that the issue is now fixed.
>>I have a question here that Why I was not pinging to default gateway 192.168.1.1 from vms ?
The KVM host must forward packets between the VM bridge (cloudbr0) and the physical network; without IP forwarding enabled, traffic from guest/System VMs can reach the host but cannot be routed out to the gateway or internet.
GitHub link: https://github.com/apache/cloudstack/discussions/12396#discussioncomment-15474154
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Re: [D] Unable to ping to external network from cloud stack system VM and virtual router [cloudstack]
Posted by "prashanthr2 (via GitHub)" <gi...@apache.org>.
GitHub user prashanthr2 added a comment to the discussion: Unable to ping to external network from cloud stack system VM and virtual router
@skatta33 can you clarify if you are noticing issues with all the VM's? or some of the guest VM's are working fine?
Based on the description looks to be bridging issue. Can you check if your KVM hosts have firewalld service running, if yes can you stop and disable it. firewalld interferes with iptables rules created by cloudstack.
Also check if IP forwarding is enabled or not
sysctl net.ipv4.ip_forward
GitHub link: https://github.com/apache/cloudstack/discussions/12396#discussioncomment-15454257
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