Google Networking Best Practices for Large Deployments Uživatelský manuál stáhnout pdf (Strana 28)

28 Networking Best Practices for Large Deployments

Proxy Configuration Tools

Download the following tools which may be helpful when configuring Proxy Servers:

• Use

pactester

or a similar tool to validate PAC files for different URIs. Download

pactester from the Google Code site.

• Download HttpWatch or HttpFox (Firefox extension) to help you see what URIs are being

requested by the browser prior to encryption.

Other Network Services

Google runs a sophisticated load-balancing system to ensure the best experience for the user.

One factor in Google load-balancing systems is the way in which Google answers DNS

requests for some services. Google attempts to determine the geographical location of a user

partly through the location of the DNS resolver’s IPv4 address.

To ensure the best experience for your users:

• Use a DNS resolver in a location that is close to the user, in terms of both geography and

network topology. Using DNS resolvers located in remote network locations will greatly

slow down connections to Google Apps.

• If it’s not feasible to use a DNS resolver that’s close to the user, use a DNS server that

supports the edns-client-subnet extension (Draft Proposal 2671)—such as Google’s

DNS server or OpenDNS—which allows the resolver to pass part of the client’s IP

address.

• Adhere to the advertised TTL value for all DNS record types.

• Set up firewall rules to allow unrestricted outbound HTTPS traffic to Google Apps. You do

not need to set up special rules for inbound traffic; Google Apps does not generally initiate

inbound traffic to users.

• Avoid routing inbound and outbound mail through a gateway inside your network. If

inbound and outbound mail is routed to a gateway inside your network, mail traffic will

consume unnecessary network resources.

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Google Networking Best Practices for Large Deployments Uživatelský manuál Strana 28