[lwip-devel] [bug #31828] lwIP AUTOIP addresses accessed from a host with a non-AUTOIP

[Bill Auerbach]

URL:
  <http://savannah.nongnu.org/bugs/?31828>

                 Summary: lwIP AUTOIP addresses accessed from a host with a
non-AUTOIP
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: billauerbach
            Submitted on: Wed 08 Dec 2010 03:53:03 PM EST
                Category: ARP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

One cannot talk to an lwIP device with an AUTOIP address from a host that
does not have an AUTOIP address.

Test case: LWIP_DHCP and LWIP_AUTOIP are both 0.  Set the device to have an
AUTOIP (link-local) address.  You cannot ping or connect to the device from an
interface that does not have an AUTOIP address.  If the interface has an
AUTOIP address, it does work OK.

There are RFC cases covering assigning AUTOIP addresses and for a device
having an AUTOIP address. I'm pretty confident that the first part (assigning)
is right. I thought maybe code is removed with LWIP_AUTOIP = 0 to cause this
problem, but setting LWIP_AUTOIP to 1 does not change this behavior.




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