[lwip-devel] [bug #60578] If no gateway is provided via DHCP, lwIP will fallback to the first address

[Patrik Lantto]

URL:
  <https://savannah.nongnu.org/bugs/?60578>

                 Summary: If no gateway is provided via DHCP, lwIP will
fallback to the first address
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: patriklantto
            Submitted on: Tue 11 May 2021 09:01:28 AM UTC
                Category: DHCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

If DHCP does not provide a gateway, lwIP will still set the first address of
the network as gateway for the netif.

It is probably very uncommon for a DHCP server not to set a gateway, but if
the functionality to "guess" a gateway should remain in lwIP, it should at
least not be the default behaviour as it otherwise may cause issues -
especially on systems with multiple netifs.




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