Your message dated Wed, 05 Aug 2026 17:31:09 +0000
with message-id <[email protected]>
and subject line Bug#1143544: Removed package(s) from unstable
has caused the Debian Bug report #745455,
regarding dhclient -6 -P regularly dies with "Impossible condition at 
dhc6.c:4111."
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
745455: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745455
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: isc-dhcp-client
Version: 4.2.2.dfsg.1-5+deb70u6
Severity: major

My server's dhclient regularly dies (every few days or weeks) with the
fatal error message "Impossible condition at dhc6.c:4111."

It is started with dhclient -cf /etc/dhcp/dhclient.conf -6 -P -v eth0

The config file is as follows:

### cut after ###
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
send dhcp6.client-id 00:30:00:01:de:ad:be:ef:f0:01;
send host-name = gethostname();
request subnet-mask, broadcast-address, time-offset, routers,
        domain-name, domain-name-servers, domain-search, host-name,
        dhcp6.name-servers, dhcp6.domain-search,
        netbios-name-servers, netbios-scope, interface-mtu,
        rfc3442-classless-static-routes, ntp-servers;
### cut before ###

Here is some typical log output (with the -v option, see above),
starting with "normal" recurring messages, and ending with the fatal
error message in question:

Apr 21 09:21:45 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 09:21:45 achernar dhclient: XMT: Renew on eth0, interval 10690ms.
Apr 21 09:21:53 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 09:21:53 achernar dhclient: IA_PD status code Success: "Prefix(es) 
renewed."
Apr 21 10:21:53 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 10:21:53 achernar dhclient: XMT: Renew on eth0, interval 10180ms.
Apr 21 10:21:53 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 10:21:53 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 10:21:53 achernar dhclient: XMT: Request on eth0, interval 930ms.
Apr 21 10:21:54 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 10:21:54 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 11:21:54 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 11:21:54 achernar dhclient: XMT: Renew on eth0, interval 10270ms.
Apr 21 11:21:54 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 11:21:54 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 11:21:54 achernar dhclient: XMT: Request on eth0, interval 1030ms.
Apr 21 11:21:54 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 11:21:54 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 12:21:54 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 12:21:54 achernar dhclient: XMT: Renew on eth0, interval 9770ms.
Apr 21 12:21:55 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 12:21:55 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 12:21:55 achernar dhclient: XMT: Request on eth0, interval 1030ms.
Apr 21 12:21:55 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 12:21:55 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 13:21:55 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 13:21:55 achernar dhclient: XMT: Renew on eth0, interval 10630ms.
Apr 21 13:22:03 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 13:22:03 achernar dhclient: IA_PD status code Success: "Prefix(es) 
renewed."
Apr 21 14:22:03 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 14:22:03 achernar dhclient: XMT: Renew on eth0, interval 9930ms.
Apr 21 14:22:09 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 14:22:09 achernar dhclient: IA_PD status code Success: "Prefix(es) 
renewed."
Apr 21 15:22:09 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 15:22:09 achernar dhclient: XMT: Renew on eth0, interval 10200ms.
Apr 21 15:22:19 achernar dhclient: XMT: Renew on eth0, interval 21320ms.
Apr 21 15:22:20 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 15:22:20 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 15:22:20 achernar dhclient: XMT: Request on eth0, interval 960ms.
Apr 21 15:22:30 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 15:22:30 achernar dhclient: Packet received, but nothing done with it.
Apr 21 15:22:31 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 15:22:31 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 16:22:31 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 16:22:31 achernar dhclient: XMT: Renew on eth0, interval 10380ms.
Apr 21 16:22:32 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 16:22:32 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 16:22:32 achernar dhclient: XMT: Request on eth0, interval 990ms.
Apr 21 16:22:32 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 16:22:32 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 17:22:32 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 17:22:32 achernar dhclient: XMT: Renew on eth0, interval 9450ms.
Apr 21 17:22:38 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 17:22:38 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 17:22:38 achernar dhclient: XMT: Request on eth0, interval 930ms.
Apr 21 17:22:46 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 17:22:46 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 18:22:46 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 18:22:46 achernar dhclient: XMT: Renew on eth0, interval 10290ms.
Apr 21 18:22:56 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 18:22:56 achernar dhclient: IA_PD status code Success: "Prefix(es) 
renewed."
Apr 21 19:22:56 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 19:22:56 achernar dhclient: XMT: Renew on eth0, interval 9470ms.
Apr 21 19:23:06 achernar dhclient: XMT: Renew on eth0, interval 18030ms.
Apr 21 19:23:08 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 19:23:08 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 19:23:08 achernar dhclient: XMT: Request on eth0, interval 1090ms.
Apr 21 19:23:17 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 19:23:17 achernar dhclient: Packet received, but nothing done with it.
Apr 21 19:23:19 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 19:23:19 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 20:23:19 achernar dhclient: PRC: Renewing lease on eth0.
Apr 21 20:23:19 achernar dhclient: XMT: Renew on eth0, interval 10970ms.
Apr 21 20:23:30 achernar dhclient: XMT: Renew on eth0, interval 21330ms.
Apr 21 20:23:43 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 20:23:43 achernar dhclient: IA_PD status code NoBinding: "Who are you? 
Do I know you?"
Apr 21 20:23:43 achernar dhclient: XMT: Request on eth0, interval 1060ms.
Apr 21 20:26:39 achernar dhclient: PRC: Prefix 2001:bc8:30e8::/48 depreferred.
Apr 21 20:26:39 achernar dhclient: Impossible condition at dhc6.c:4111.

I don't know why I regularly get NoBinding status codes, nor whether
this has something to do with the problem.

Also here are the normal startup messages:

Apr 21 22:38:25 achernar dhclient: Internet Systems Consortium DHCP Client 4.2.2
Apr 21 22:38:25 achernar dhclient: Copyright 2004-2011 Internet Systems 
Consortium.
Apr 21 22:38:25 achernar dhclient: All rights reserved.
Apr 21 22:38:25 achernar dhclient: For info, please visit 
https://www.isc.org/software/dhcp/
Apr 21 22:38:25 achernar dhclient: 
Apr 21 22:38:26 achernar dhclient: Bound to *:546
Apr 21 22:38:26 achernar dhclient: Listening on Socket/eth0
Apr 21 22:38:26 achernar dhclient: Sending on   Socket/eth0
Apr 21 22:38:27 achernar dhclient: XMT: Rebind on eth0, interval 1010ms.
Apr 21 22:38:27 achernar dhclient: send_packet6: Network is unreachable
Apr 21 22:38:27 achernar dhclient: dhc6: send_packet6() sent -1 of 77 bytes
Apr 21 22:38:28 achernar dhclient: XMT: Rebind on eth0, interval 2030ms.
Apr 21 22:38:28 achernar dhclient: send_packet6: Network is unreachable
Apr 21 22:38:28 achernar dhclient: dhc6: send_packet6() sent -1 of 77 bytes
Apr 21 22:38:30 achernar dhclient: XMT: Rebind on eth0, interval 3650ms.
Apr 21 22:38:33 achernar dhclient: XMT: Rebind on eth0, interval 6960ms.
Apr 21 22:38:40 achernar dhclient: PRC: Prefix 2001:bc8:30e8::/48 depreferred.
Apr 21 22:38:40 achernar dhclient: PRC: Prefix 2001:bc8:30e8::/48 expired.
Apr 21 22:38:40 achernar dhclient: PRC: Bound lease is devoid of active 
addresses.  Re-initializing.
Apr 21 22:38:41 achernar dhclient: XMT: Solicit on eth0, interval 1060ms.
Apr 21 22:38:42 achernar dhclient: XMT: Solicit on eth0, interval 2080ms.
Apr 21 22:38:42 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 22:38:42 achernar dhclient: Packet received, but nothing done with it.
Apr 21 22:38:44 achernar dhclient: XMT: Solicit on eth0, interval 4360ms.
Apr 21 22:38:49 achernar dhclient: XMT: Solicit on eth0, interval 8650ms.
Apr 21 22:38:57 achernar dhclient: RCV: Advertise message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 22:38:57 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."
Apr 21 22:38:57 achernar dhclient: XMT: Request on eth0, interval 1060ms.
Apr 21 22:38:58 achernar dhclient: XMT: Request on eth0, interval 2220ms.
Apr 21 22:39:01 achernar dhclient: XMT: Request on eth0, interval 4590ms.
Apr 21 22:39:05 achernar dhclient: XMT: Request on eth0, interval 9090ms.
Apr 21 22:39:10 achernar dhclient: RCV: Reply message on eth0 from 
fe80::8a43:e1ff:fe7c:7bff.
Apr 21 22:39:10 achernar dhclient: IA_PD status code Success: "Assigned fixed 
out-of-pool address."

Tell me whether I can do something to help debug this.  Also please
tell me if this is the sort of bugs that are liable to get fixed in
Debian stable.

-- 
     David A. Madore
   ( http://www.madore.org/~david/ )

--- End Message ---
--- Begin Message ---
Version: 4.4.3-P1-8+rm

Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
[email protected].

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)

--- End Message ---

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