patchlwIP - A Lightweight TCP/IP stack - Patches: patch #9858, dhcp/dhcp6: Ensure that...


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patch #9858: dhcp/dhcp6: Ensure that DHCP/DHCPv6 DNS server updates don't overlap

Submitter:  David J. Fiddes <davefiddes>
Submitted:  Thu 03 Oct 2019 12:05:06 PM UTC
Category:  None Priority:  5 - Normal
Status:  None Privacy:  Public
Assigned to:  None Open/Closed:  Open
Planned Release:  None

Tue 10 Dec 2019 08:58:08 PM UTC, comment #1: 

Same as for the NTP patch: I think configuring a specific number of v4/v6 entries would be better than trying to hide this behind an automatism.

Simon Goldschmidt <goldsimon>
Project Administrator
Thu 03 Oct 2019 12:05:06 PM UTC, original submission:  

This change changes the DHCP and DHCPv6 DNS server option update
processing so that both IPv4 and IPv6 servers can be held in the
list of active DNS servers. Previously when a DHCP offer is processed
the list of active DNS servers is replaced. This can lead to failed
DNS resolution when there is a connectivity over one IP protocol
but not over the other. This change improves the possibility of
DNS resolution falling back to a working DNS server.

 - On LWIP configured to use 2 DNS server entries. Configure DHCP and
   DHCPv6 to have 0,1 or 2 DNS servers on each protcol. Ensure that
   the list of active DNS servers reflects the network configuration.
   In the case of overflow ensure that one protocol wins based on the
   first processed DHCP response.
 - On a network with intermittent IPv6 connectivity ensure that DNS
   resolution continues to function as DHCP and DHCPv6 updates are

David J. Fiddes <davefiddes>


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Depends on the following items: None found

Items that depend on this one: None found


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  • -email is unavailable- added by goldsimon (Posted a comment)
  • -email is unavailable- added by davefiddes (Submitted the item)

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-10-03 davefiddes Attached File- Added 0003-dhcp-dhcp6-Ensure-that-DHCP-DHCPv6-DNS-server-update.patch, #47612

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