Cisco Cisco Email Security Appliance C650 Guía Del Usuario
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User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
Chapter 25 Configuring Routing and Delivery Features
Controlling Email Delivery Using Destination Controls
Determining Which Interface is Used for Mail Delivery
Unless you specify the output interface via the
deliveryconfig
command or via a message filter
(
alt-src-host
), or through the use of a virtual gateway, the output interface is selected by the AsyncOS
routing table. Basically, selecting “auto” means to let AsyncOS decide.
In greater detail: local addresses are identified by applying the interface netmask to the interface IP
address. Both of these are set via the Network > Interfaces page or by the
address. Both of these are set via the Network > Interfaces page or by the
interfaceconfig
command
(or during system setup). If the address space overlaps, the most specific netmask is used. If a destination
is local, packets are sent via the appropriate local interface.
is local, packets are sent via the appropriate local interface.
If the destination is not local, packets are sent to the default router (set via the Network > Routing page
or with the
or with the
setgateway
command). The IP address of the default router is local. The output interface is
determined by the rule for selecting the output interface for local addresses. For example, AsyncOS
chooses the most specific IP address and netmask that include the default router's IP address.
chooses the most specific IP address and netmask that include the default router's IP address.
The routing table is configured via the Network > Routing page (or via the
routeconfig
command). A
matching entry in the routing table takes precedence over the default route. A more specific route take
precedence over a less specific route.
precedence over a less specific route.
Default Delivery Limits
Each outbound destination domain has its own outbound queue. Therefore, each domain has a separate
set of concurrency limits as specified in the Destination Controls table. Further, each unique domain not
listed specifically in the Destination Controls table uses another set of the “Default” limits as set in the
table.
set of concurrency limits as specified in the Destination Controls table. Further, each unique domain not
listed specifically in the Destination Controls table uses another set of the “Default” limits as set in the
table.
Working with Destination Controls
Use the Mail Policies > Destination Controls page in the GUI or the
destconfig
command in the CLI to
create, edit, and delete Destination Control entries.
Related Topics
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Controlling the Version of Internet Protocol Addresses
You can configure which version of Internet Protocol addresses to use for the connection to a domain.
The Email Security appliance uses both Internet Protocol version 4 (IPv4) and Internet Protocol version
(IPv6). You can configure a listener on the appliance to use one version of the protocol or both.
The Email Security appliance uses both Internet Protocol version 4 (IPv4) and Internet Protocol version
(IPv6). You can configure a listener on the appliance to use one version of the protocol or both.