We have a site-to-site VPN between a Cisco ASA and a pair of Linux routers which operate our offsite datacenter for stackoverflow.com. When we turn on SQL replication over the link, software interrupts peg a core at 100% and the ethernet stack becomes so sluggish that performance of the rest of the network is degraded.<br />
<br />
Unfortunately I don't have a tremendous amount of detail to provide but will happily do whatever steps required to help pinpoint this issue.
↧