[FS#3706] odhcpd defaults to advertising it's own host as a resolver

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Brian J. Murrell (brianjmurrell) 

Attached to Project - OpenWrt/LEDE Project
Summary - odhcpd defaults to advertising it's own host as a resolver
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
x86_64
 - Software versions of OpenWrt/LEDE release, packages, etc.
19.07.7
Package: odhcpd
Version: 2020-05-03-49e4949c-3
 - Steps to reproduce
Configure LAN interface for IPv6.  In the "config dhcp 'lan'" section of /etc/config/dhcp don't configure any dns items.

Observe that odhcpd (possibly incorrectly) just assumes the host that it is running on is a DNS resolver and puts the IP address of the node it's running in it's RAs as a "Recursive DNS server".

Of course, if there is a resolver running in the network with an IPv6 address, I can use "list dns '...'" to specify it.

But if there is no resolver with an IPv6 address, including the host odhcpd is running on, there is no way to prevent odhcpd from announcing an invalid "Recursive DNS server" as it incorrectly announces itself barring any "dns" option/list configuration.


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3706

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