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Foundry Configuration Guide for the FESX, FSX, and FWSX
16 - 24
© Foundry Networks, Inc.
December 2005
Specifying a Single Source Interface for Telnet, TACACS/,
or RADIUS Packets
When the Layer 3 Switch originates a Telnet, TACACS/, or RADIUS packet, the source address of the
packet is the lowest-numbered IP address on the interface that sends the packet. You can configure the Layer 3
Switch to always the lowest-numbered IP address on a specific interface as the source addresses for these types
of packets. When you configure the Layer 3 Switch to use a single source interface for all Telnet, TACACS/
, or RADIUS packets, the Layer 3 Switch uses the same IP address as the source for all packets of the
specified type, regardless of the port(s) that actually sends the packets.
Identifying a single source IP address for Telnet, TACACS/, or RADIUS packets provides the following
benefits:
•
If your Telnet, TACACS/, or RADIUS server is configured to accept packets only from specific IP
addresses, you can use this feature to simplify configuration of the server by configuring the Foundry device
to always send the packets from the same link or source address.
•
If you specify a loopback interface as the single source for Telnet, TACACS/, or RADIUS packets,
servers can receive the packets regardless of the states of individual links. Thus, if a link to the server
becomes unavailable but the client or server can be reached through another link, the client or server still
receives the packets, and the packets still have the source IP address of the loopback interface.
The software contains separate CLI commands for specifying the source interface for Telnet, TACACS/,
or RADIUS packets. You can configure a source interface for one or more of these types of packets separately.
To specify an Ethernet or a loopback or virtual interface as the source for all TACACS/ packets from the
device, use the following CLI method. The software uses the lowest-numbered IP address configured on the port
or interface as the source IP address for TACACS/ packets originated by the device.
The following sections show the syntax for specifying a single source IP address for Telnet, TACACS/,
and RADIUS packets.
Telnet Packets
To specify the lowest-numbered IP address configured on a virtual interface as the device’s source for all Telnet
packets, enter commands such as the following:
FESX424 Router(config)# int loopback 2
FESX424 Router(config-lbif-2)# ip address 10.0.0.2/24
FESX424 Router(config-lbif-2)# exit
FESX424 Router(config)# ip telnet source-interface loopback 2
The commands in this example configure loopback interface 2, assign IP address 10.0.0.2/24 to the interface, then
designate the interface as the source for all Telnet packets from the Layer 3 Switch.
Syntax:
ip telnet source-interface ethernet [<slotnum>/]<portnum> | loopback <num> | ve <num>
The <num> parameter is a loopback interface or virtual interface number. If you specify an Ethernet port, the
<portnum> is the port’s number (including the slot number, if you are configuring a Chassis device).
The following commands configure an IP interface on an Ethernet port and designate the address port as the
source for all Telnet packets from the Layer 3 Switch.
FastIron SuperX Router(config)# interface ethernet 1/4
FastIron SuperX Router(config-if-1/4)# ip address 209.157.22.110/24
FastIron SuperX Router(config-if-1/4)# exit
FastIron SuperX Router(config)# ip telnet source-interface ethernet 1/4
Summary of Contents for FastIron Edge Switch X424
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