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  • Re: Upgrade from 9.14 to 9.16 - transfer-source with low source port no longer works.

    From =?utf-8?B?T25kxZllaiBTdXLDvQ==?=@ondrej@isc.org to Ingeborg Hellemo on Tue May 26 11:47:48 2020
    From Newsgroup: comp.protocols.dns.bind


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    Hi Ingeborg,

    please see release notes:

    =
    https://downloads.isc.org/isc/bind9/9.16.3/RELEASE-NOTES-bind-9.16.3.html

    This is listed in Known Issues for BIND 9.16.1:

    =E2=80=A2 UDP network ports used for listening can no longer =
    simultaneously be used for sending traffic. An example configuration =
    which triggers this issue would be one which uses the same address:port =
    pair for listen-on(-v6) statements as for notify-source(-v6) or = transfer-source(-v6). While this issue affects all operating systems, it =
    only triggers log messages (e.g. "unable to create dispatch for reserved = port") on some of them. There are currently no plans to make such a = combination of settings work again.

    Ondrej
    --
    Ond=C5=99ej Sur=C3=BD
    ondrej@isc.org

    On 26 May 2020, at 11:38, Ingeborg Hellemo <ingeborg.hellemo@uit.no> =
    wrote:
    =20
    FreeBSD 11.3-RELEASE-p3
    =20
    This morning I upgraded from BIND 9.14.11 to 9.16.3 via FreeBSD ports.
    =20
    Then I realize that my slave server no longer transfer zones from the =
    master.
    The zone transfers worked as expected before the upgrade.
    =20
    There are no error messages. The slave receives notifies from the =
    master:
    =20
    May 26 09:40:35 ludvigsen named[22721]: client @0x81d593f68 129.242.4.254#24673: received notify for zone 'av.uit.no'
    May 26 09:40:35 ludvigsen named[22721]: zone av.uit.no/IN: notify from 129.242.4.254#24673: serial 2020052600
    =20
    I can do a 'rndc reload <zone>' without errors:
    =20
    May 26 09:57:29 ludvigsen named[22721]: received control channel =
    command
    'reload av.uit.no'
    =20
    If I do a full 'rndc reload' I finally get an error:
    =20
    May 26 11:08:14 ludvigsen named[25953]: unable to create dispatch for =
    reserved
    port 129.242.5.254#53: permission denied
    =20
    Since this is a host with serveral virtual interfaces this =
    address/port is set
    in named.conf:
    =20
    transfer-source 129.242.5.254 port 53;
    =20
    The solution was to remove the 'port 53' part of the config,
    =20
    =20
    =20
    Finally, the question:
    =20
    Has there been some change in when named changes user id and drops =
    privilege
    from root? Or some other changes that can explain the error?
    =20
    =20
    =20
    =20
    --Ingeborg
    --
    Ingeborg =C3=98strem Hellemo -- ingeborg.hellemo@uit.no
    Dep. of Information Technology --- Univ. of Troms=C3=B8
    =20
    =20
    =20
    _______________________________________________
    Please visit https://lists.isc.org/mailman/listinfo/bind-users to =
    unsubscribe from this list
    =20
    ISC funds the development of this software with paid support =
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    =20
    =20
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