I'm trying to create a GRE tunnel so i can transfer, temporarly, some VMS from one dc to another.
I have created a gretap interface between the servers and bridged it to the vmbr1 bridge which is used on the VMs. So far so good, the traffic seems to pass well between the servers.
After i have created a VM on one of the servers with an IP from the other datacenter, i can ping it well, it can ping other internet addreses, dns works and even some very small http requests like curl showip.net . However, any bigger request like requesting a larger page, or even curl https://showip.net fails with tcp errors.
By changing the MTU to 1200 on the guest OS of the VM, it seems to solve the issues on my lab. However, it is not an option for the VMs i want to transfer as i cannot access the OS.
I have tried to change the public interface (eno1) to mtu 9000, but no progress.
I have also tried to change the mtu for the gretap interface to multiple variants including 1200, but nothing changed.
Does anyone have some idea?
I have created a gretap interface between the servers and bridged it to the vmbr1 bridge which is used on the VMs. So far so good, the traffic seems to pass well between the servers.
After i have created a VM on one of the servers with an IP from the other datacenter, i can ping it well, it can ping other internet addreses, dns works and even some very small http requests like curl showip.net . However, any bigger request like requesting a larger page, or even curl https://showip.net fails with tcp errors.
By changing the MTU to 1200 on the guest OS of the VM, it seems to solve the issues on my lab. However, it is not an option for the VMs i want to transfer as i cannot access the OS.
I have tried to change the public interface (eno1) to mtu 9000, but no progress.
I have also tried to change the mtu for the gretap interface to multiple variants including 1200, but nothing changed.
Does anyone have some idea?
