Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 310)

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Clusters

When a connection is established by a client for an HTTPS cluster, Equalizer performs the SSL processing on the

request (this is called SSL off loading), and adds some additional headers to the client's request before forwarding

the request on to a server:

X-LoadBalancer: CoyotePoint Equalizer

X-Forwarded-For: (client's IP address)

If the client provides an SSL certificate, the following are also added:

X-SSL-Subject: (certificate's X509 subject)

X-SSL-Issuer: (certificate's X509 issuer)

X-SSL-notBefore: (certificate not valid before info)

X-SSL-notAfter: (certificate not valid after info)

X-SSL-serial: (certs serial number)

X-SSL-cipher: (cipher spec)

If these headers are present in a request received by a server, then the server knows that the request was

originally an HTTPS request and was processed by Equalizer before being forwarded to the server.

These headers are inserted into every request if the once only flag is disabled; if once only is enabled, then only

the first request in a connection will have these headers inserted.

Some application may require a special header in the request, and the following section describes how Equalizer

can be configured to provide a custom HTTPS header for such applications.

Providing FTP Services on a Virtual Cluster

The FTP protocol dates from the 1970s, and was designed to be used in an environment where:

l the network topology is simple

l the FTP server and client communicate directly with one another

l the addresses used by the client and server for active FTP data connections can be negotiated over the

FTP control connection

l the FTP server is able to make connections back to the FTP client

l These operational characteristics of FTP require special configuration for load balancers (as well as

firewalls and NAT devices) that pass traffic between FTP servers and FTP clients:

l NAT devices and routers (including load balancers like Equalizer) on the client and server sides must be

configured to monitor FTP transactions and provide appropriate address translation and packet rewriting.

l Firewalls on the client and server sides must be configured to let traffic on the ports used for FTP through

the firewall.

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