I have a connection between two datacenters and rsync between them stalls often. I think it is related to the mtu 9000 (I actualy set it to 8900 because of some possible vlan use)
I have the impression that the icmp mtu 8900 is working, but that tcp traffic is having sometimes problems with big frames.
Has any one experienced something similar? And how do you test MTU 8900 with just a tcp test?
PS. I don't have control over this connection