Starting dhcpcd terminates the established PPPoE connection

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My firewall runs LEAF Bering-uClibc 6.0.0, which comes with pppd 2.4.7
and dhcpcd 6.11.5. Most of the time IPv6 is working, but from time to
time I have the following really strange problem. The PPPoE connection
is established (with +ipv6 in /etc/ppp/options). But whenever I start
the dhcpcd, which should obtain IPv6 adresses through DHCPv6-PD, the
connection gets terminated.

>From the logs it looks like the ISP terminates the connection (LCP
terminated by peer) because it wasn't able to serve me an IPv6 range
(DHCPv6 REPLY: NOPREFIX-AVAIL).

Does that make sense?

Is that a problem with my ISP?

Or is that a problem on my side? The problem started after I've
rebooted the firewall, maybe some state file did not survive the
reboot.

Sven


>From /var/log/daemon.log:

Dec 25 02:26:55 kaldra dhcpcd[9062]: ppp0: unsupported interface family 00
Dec 25 02:26:55 kaldra dhcpcd[9062]: forked to background, child pid 9083
Dec 25 02:26:55 kaldra dhcpcd[9083]: DUID
00:01:00:01:1e:92:58:a5:00:0d:b9:40:7f:ec
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.100: IAID b9:40:7f:ee
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.100: IAID conflicts with one
assigned to em2.170
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.170: IAID b9:40:7f:ee
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.170: IAID conflicts with one
assigned to em2.100
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.191: IAID b9:40:7f:ee
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.191: IAID conflicts with one
assigned to em2.100
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.192: IAID b9:40:7f:ee
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.192: IAID conflicts with one
assigned to em2.100
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.193: IAID b9:40:7f:ee
Dec 25 02:26:55 kaldra dhcpcd[9083]: em2.193: IAID conflicts with one
assigned to em2.100
Dec 25 02:26:55 kaldra dhcpcd[9083]: ppp0: IAID 70:70:70:30
Dec 25 02:26:55 kaldra dhcpcd[9083]: ppp0: IAID 00:00:00:01
Dec 25 02:26:55 kaldra dhcpcd[9083]: ppp0: soliciting a DHCPv6 lease
Dec 25 02:26:55 kaldra dhcpcd[9083]: ppp0: soliciting an IPv6 router
Dec 25 02:26:55 kaldra dhcpcd[9083]: ppp0: Router Advertisement from
fe80::20e:d6ff:fea6:ec1b
Dec 25 02:26:55 kaldra dhcpcd[9083]: ppp0: adding address
2a02:200:2f00:91d:dd04:a113:6f76:82f4/64
Dec 25 02:26:56 kaldra dhcpcd[9083]: ppp0: DHCPv6 REPLY: NOPREFIX-AVAIL
Dec 25 02:26:56 kaldra dhcpcd[9083]: ppp0: carrier lost
Dec 25 02:26:56 kaldra dhcpcd[9083]: ppp0: deleting address
2a02:200:2f00:91d:dd04:a113:6f76:82f4/64
Dec 25 02:26:57 kaldra dhcpcd[9083]: ppp0: removing interface


>From /var/log/ppp.log:

Dec 25 02:26:56 kaldra pppd[8185]: rcvd [LCP TermReq id=0x2]
Dec 25 02:26:56 kaldra pppd[8185]: LCP terminated by peer
Dec 25 02:26:56 kaldra pppd[8185]: Connect time 1.0 minutes.
Dec 25 02:26:56 kaldra pppd[8185]: Sent 470280 bytes, received 513340 bytes.
Dec 25 02:26:56 kaldra pppd[8185]: Script /etc/ppp/ip-down started (pid 9097)
Dec 25 02:26:56 kaldra pppd[8185]: Script /etc/ppp/ipv6-down started (pid 9100)
Dec 25 02:26:56 kaldra pppd[8185]: sent [LCP TermAck id=0x2]
Dec 25 02:26:56 kaldra pppd[8185]: Script /etc/ppp/ip-down finished
(pid 9097), status = 0x1
Dec 25 02:26:56 kaldra pppd[8185]: Script /etc/ppp/ipv6-down finished
(pid 9100), status = 0x1
Dec 25 02:26:57 kaldra pppd[8185]: rcvd [LCP TermReq id=0x8f]
Dec 25 02:26:57 kaldra pppd[8185]: sent [LCP TermAck id=0x8f]
Dec 25 02:26:57 kaldra pppd[8185]: Modem hangup
Dec 25 02:26:57 kaldra pppd[8185]: Connection terminated.
Dec 25 02:26:57 kaldra pppd[8185]: Connect time 1.0 minutes.
Dec 25 02:26:57 kaldra pppd[8185]: Sent 470280 bytes, received 513520 bytes.
Dec 25 02:26:57 kaldra pppd[8185]: Failed to disconnect PPPoE socket:
114 Operation already in progress
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