Set the telnet source IP address for a Cisco router
Contributed by qmchenry 
Tagged: Cisco router The default source IP address when telnetting from a Cisco router is that of the interface closest to the destination. Because some access lists may block traffic from the default IP address, or to help test access lists, it may be useful to temporarily or permanently set the telnet source IP address.
To temporarily set the telnet source IP address for a single telnet session, use the /source-interface extension to the telnet command. For example, to telnet to 192.168.1.4 using the source IP address of the interface FastEthernet0
telnet 192.168.1.4 /source-interface FastEthernet0
To set this interface as the source IP address for all telnet sesions, use this command in configuration mode (conf t):
ip source-interface fastethernet0
You may also like -
Assign or configure IP addresses on Cisco routers
Show the IP routing table in a Cisco router
Configure Cisco switch telnet login and password
Cisco HSRP (like VRRP) - Redundant gateway router configuration
Cisco switch: 802.1q trunk to router, aka router-on-a-stick
Show a summary of a Cisco router interfaces
Cisco: How to configure NAT [Network Address Translation]
Cisco Hot Standby Router Protocol
great idea said on October 29, 2008
Brilliant tip, got me out of a hole tonight!
Mike said on May 19, 2010
Anything similar for SSH?
Richey said on December 8, 2010
This command did not work on a box with 12.3. I used “ip telnet source-interface interface fa0/0″
Satyadevan W said on March 25, 2011
how to assign an ipaddress for auxiliary port in a router
mike said on October 2, 2011
Thx dude