Diagnosing packet loss / high latency in Ubuntu
- by Sam Gammon
We have a Linux box (Ubuntu 12.04) running Nginx (1.5.2), which acts as a reverse proxy/load balancer to some Tornado and Apache hosts. The upstream servers are physically and logically close (same DC, sometimes same-rack) and show sub-millisecond latency between them:
PING appserver (10.xx.xx.112) 56(84) bytes of data.
64 bytes from appserver…