Re: rtadvd appears to ignore options set in /etc/rtadvd.conf

[Karl Denninger]

Nope -- no change:


          source link-address option (1), length 8 (1): 00:e0:b4:68:f8:95







On 7/23/2025 23:26, John Hay wrote:

07:44:23.810602 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::2e0:b4ff:fe68:f895 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56         hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms           prefix info option (3), length 32 (4): 2606:83c0:8000:1b00::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s Note that I cannot set an actual valid "address" in the config file since I have no clue what it is in advance (it comes off the delegation from the ISP of course) This looks like a bug (starting rtadvd with verbose debugging on in the foreground doesn't log any complaints -- it looks like it just ignores the parameters.)

Hi Karl,

What if you use a = instead of the #? For example :vltime=86400:

I set rdnss and dnssl using = and that works.

John


On Thu, 24 Jul 2025 at 01:38, Karl Denninger <k...@denninger.net> wrote:

    On 7/23/2025 16:47, Bjoern A. Zeeb wrote:

    On Wed, 23 Jul 2025, Karl Denninger wrote:

    Hi,

    (sorry I deleted the message as the tex/only part was barely
    parsable).

    Can you, for testing, try adding an
        addr="xxx:xxx:xxx:xxxx::":\
    to one of your entries and see if the behaviour changes?

    /bz

    root@IpGw:/etc # more /etc/rtadvd.conf
    # Set the preferred lifetime to 10 minutes on advertised prefixes.
    # All other parameters are default.
    #
    default:\
            :vltime#86400:\
            :pltime#3600:\
            :prefixlen#64:addr="xxx:xxx:xxx:xxxx::":
    ix1:\
            :vltime#86400:\
            :pltime#3600:\
            :prefixlen#64:addr="xxx:xxx:xxx:xxxx::":
    ix1.4:\
            :vltime#86400:\
            :pltime#3600:\
            :prefixlen#64:

    No change -- the announcement is going out on ix1 from the gateway.

    On machine receiving the advertisements:

    19:35:49.085297 IP6 (hlim 255, next-header ICMPv6 (58) payload
    length: 56) fe80::2e0:b4ff:fe68:f895 > ff02::1: [icmp6 sum ok]
    ICMP6, router advertisement, length 56
            hop limit 64, Flags [none], pref medium, router lifetime
    1800s, reachable time 0ms, retrans timer 0ms
              source link-address option (1), length 8 (1):
    00:e0:b4:68:f8:95
              prefix info option (3), length 32 (4):
    2606:83c0:8000:1b00::/64, Flags [onlink, auto], *_valid time
    2592000s, pref. time 604800s_*



    k...@denninger.net
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-- Karl Denninger

--
Karl Denninger
k...@denninger.net
/The Market Ticker/
/[S/MIME encrypted email preferred]/

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