Google Networking Best Practices for Large Deployments Bedienungsanleitung PDF herunterladen (Seite 42)

42 Networking Best Practices for Large Deployments

Network Packet Captures

A network packet capture can help you to discover problems that may negatively affect the

round-trip time or overall latency for Google Apps users, such as:

• Different types of network flooding problems (ARP, TCP, UDP, IP, etc.)

• MTU mis-matches for Ethernet

• Malicious traffic on your network

Packet captures are helpful even though Google Apps typically uses HTTPS connections.

Packet captures will still show dropped packets, retransmits, window resizing, and evidence of

saturated links.

One way to gather this type of data is to enable port mirroring, which allows you to capture

traffic for a certain port or VLAN and divert it another port where a service listens and logs all

the traffic. Another approach is to use technologies such as Wireshark to capture data on a

machine for later analysis.

Network multiping Helps monitor network latency, uptime, and

route changes.

Packet Capture Wireshark Performs packet captures.

RTT latency wbox Attempts to measure RTT of web application

latency using HTTP/TCP latency.

Trace tcptrace Similar to traceroute but uses TCP packets

rather than ICMP packets.

Type of Monitoring Tool Description

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Google Networking Best Practices for Large Deployments Bedienungsanleitung Seite 42