AIS AI2524 user manual Ip helper

Chapter 5: Using AutoInstall

3.An IP address-to-host name mapping for the new router must be added to a Domain Naming System (DNS) database file.

zIf the existing router is to help automatically install the new route via an HDLC-encapsulated serial interface using Serial Line Ad- dress Resolution Protocol (SLARP), that interface must be config- ured with an IP address whose host portion has the value 1 or 2. (AutoInstall over Frame Relay does not have this address con- straint.) Subnet masks of any size are supported.

zIf the existing router is to help automatically install the new route using a Frame Relay-encapsulated serial interface, that interface must be configured with:

An IP helper address pointing to the TFTP server. In this example, 171.69.2.75 is the address of the TFTP server:

ip helper 171.69.2.75

A Frame Relay map pointing back to the new router. In this exam- ple, 172.21.177.100 is the IP address of the new router's serial in- terface, and 100 is the PVC identifier:

frame-relay map ip 172.21.177.100 100 dlci

zIf the existing router is to help automatically install the new route via an Ethernet, Token Ring, or FDDI interface using BOOTP o Reverse Address Resolution Protocol (RARP), a BOOTP or RARP server also must be set up to map the new router's Media Access Control (MAC) address to its IP address.

zIP helper addresses should be configured to forward the TFTP and DNS broadcast requests from the new router to the host providing those services.

August 1997	Page 5-3
2524UM