https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252121
Bug ID: 252121
Summary: [patch] rtadvd should not put an upper limit on
rdnssltime and dnsslltime
Product: Base System
Version: 12.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: ta0k...@gmail.com
Created attachment 220903
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=220903&action=edit
Removes upper limit on RDNSS and DNSSL lifetimes.
rtadvd (in config.c) limits both rdnssltime and dnsslltime to 2*maxinterval. If
this limit is exceeded, rtadvd completely discards the corresponding rdnss or
dnssl and sends router advertisements without it. This means that sending RAs
every 15s places an upper limit on rdnssltime of 30s.
Specifically, this short lifetime seems to prevent Android 11 (maybe others)
from accepting the RDNSS option. (It's unclear what its minimum is, but 600s
seems to be fine.)
I've attached a patch to effectively remove the upper limits. To make it
minimally intrusive, I just set the upper limit to USHRT_MAX. (Potentially
making it 32-bit would be a separate issue.)
Note that RFC 8106 (https://tools.ietf.org/html/rfc8106) recommends a default
value of 3*maxinterval for both parameters, and doesn't mention any sort of
upper limit.
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