dhclient: purpose of fallback_interface

[Ulrich Weber]

Hi,

whats the purpose of the fallback_interface in the
dhclient code? I couldn't find a way to disable it.

With fallback_interface set, RENEW/REBIND messages
might be sent over the wrong interface, if there are
multiple Uplinks and the DHCP server address is not within
the same network as the Uplink interface.

Deactivating fallback_interface in send_request/send_release
forces the Source IP address to the IP address of the correct
interface and packets are routed correctly.

Cheers
  Ulrich

-- 
Ulrich Weber |ulrich.weber at sophos.com  | Senior Software Engineer
Astaro - a Sophos company | Amalienbadstr 41 | 76227 Karlsruhe | Germany
Phone +49-721-25516-0 | Fax –200 |www.astaro.com

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