[pkg-dhcp-devel] Bug#882250: isc-dhcp-server: The dhcpv6 server does not respond to solicits, and therefore does not hand out ipv6 leases.

Robert Senger rs-debian at microscopium.de
Thu Dec 28 00:52:27 UTC 2017 

Package: isc-dhcp-server
Version: 4.3.5-3
Followup-For: Bug #882250

I can confirm this bug after upgrading from Debian 8 Jessie to Debian 9
Stretch.

I am running isc-dhcp-server in both v4 and v6 mode on a number of interfaces,
one LAN and several WLAN interfaces.

Before upgrade, clients got v6 addresses on all interfaces. After upgrade, only
WLAN clients get v6 addresses from isc-dhcp-server. Whenever LAN clients
connect, I see solicit messages in the isc-dhcp-server logs and in tcpdump
output, but there's never sent an answer. Radvd and ipv4 works fine on all
interfaces.

The only difference between LAN and WLAN interface is that the LAN interface
has some additional addresses used as listening addresses by a local squid
proxy and that it has a global dynamic address assigned by the ISP.

Some configuration and debugging information:

root at prokyon:/etc/dhcp# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.251  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fd10:2842:f0d1:101:20d:b9ff:fe0d:84b0  prefixlen 128  scopeid
0x0<global>
        inet6 2001:472:7d:977::53  prefixlen 128  scopeid 0x0<global>
        inet6 2001:a61:4619:8f01::1  prefixlen 64  scopeid 0x0<global>
        inet6 fd10:3d52:f521::13  prefixlen 128  scopeid 0x0<global>
        inet6 2001:472:7d:977::13  prefixlen 128  scopeid 0x0<global>
        inet6 fd10:5d12:c721::13  prefixlen 128  scopeid 0x0<global>
        inet6 fd10:2842:f0d1::13  prefixlen 128  scopeid 0x0<global>
        inet6 fd10:7d41:b631::13  prefixlen 128  scopeid 0x0<global>
        inet6 2001:472:52b5:101:20d:b9ff:fe0d:84b0  prefixlen 128  scopeid
0x0<global>
        inet6 fe80::20d:b9ff:fe0d:84b0  prefixlen 64  scopeid 0x20<link>
        ether 00:0d:b9:0d:84:b0  txqueuelen 1000  (Ethernet)
        RX packets 9329004  bytes 6196176943 (5.7 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7248452  bytes 4465680935 (4.1 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root at prokyon:/etc/dhcp# ifconfig wlan0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.123  netmask 255.255.255.128  broadcast 192.168.1.127
        inet6 2001:472:52b5:202:a5:4ff:fe3d:9610  prefixlen 128  scopeid
0x0<global>
        inet6 fd10:2842:f0d1:202:a5:4ff:fe3d:9610  prefixlen 128  scopeid
0x0<global>
        inet6 fe80::a5:4ff:fe3d:9610  prefixlen 64  scopeid 0x20<link>
        ether 02:a5:04:3d:96:10  txqueuelen 1000  (Ethernet)
        RX packets 645631  bytes 147489457 (140.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 813939  bytes 494687778 (471.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


dhcpd6.conf:
subnet6 fd10:2842:f0d1:101::/64 {
        # lan

        # Range for clients
        range6 fd10:2842:f0d1:101:af31:9c41:dd6b:7a4
fd10:2842:f0d1:101:af31:9c41:dd6b:7c4;

        # Range for clients requesting a temporary address
        range6 fd10:2842:f0d1:101::/64 temporary;

        # Additional options
        option dhcp6.name-servers fd10:2842:f0d1:101:20d:b9ff:fe0d:84b0;
        option dhcp6.sntp-servers fd10:2842:f0d1:101:20d:b9ff:fe0d:84b0;
        option dhcp6.domain-search "its-me.de";

        # Prefix range for delegation to sub-routers
        #prefix6 2001:472:7c:100:: 2001:db8:0:f00:: /56;

        ddns-domainname "its-me.de.";
        ddns-rev-domainname "ip6.arpa.";
}

subnet6 fd10:2842:f0d1:202::/64 {
        # wlan

        # Range for clients
        range6 fd10:2842:f0d1:202:5d32:abf3:7de2:5d3
fd10:2842:f0d1:202:5d32:abf3:7de2:5f3;

        # Range for clients requesting a temporary address
        range6 fd10:2842:f0d1:202::/64 temporary;

        # Additional options
        option dhcp6.name-servers fd10:2842:f0d1:101:20d:b9ff:fe0d:84b0;
        option dhcp6.sntp-servers fd10:2842:f0d1:101:20d:b9ff:fe0d:84b0;
        option dhcp6.domain-search "its-me.de";

        # Prefix range for delegation to sub-routers
        #prefix6 2001:472:7c:100:: 2001:db8:0:f00:: /56;

        ddns-domainname "its-me.de.";
        ddns-rev-domainname "ip6.arpa.";
}

dhcpd.log: (LAN client, broken)
Dec 28 01:41:51 prokyon dhcpd[27274]: Solicit message from
fe80::230:5ff:fe96:90dd port 546, transaction ID 0x925C6800
Dec 28 01:41:53 prokyon dhcpd[27274]: Solicit message from
fe80::230:5ff:fe96:90dd port 546, transaction ID 0x925C6800
Dec 28 01:41:55 prokyon dhcpd[27274]: Solicit message from
fe80::230:5ff:fe96:90dd port 546, transaction ID 0x925C6800
Dec 28 01:41:59 prokyon dhcpd[27274]: Solicit message from
fe80::230:5ff:fe96:90dd port 546, transaction ID 0x925C6800
Dec 28 01:42:07 prokyon dhcpd[27274]: Solicit message from
fe80::230:5ff:fe96:90dd port 546, transaction ID 0x925C6800

tcpdump: (LAN client, broken)
01:42:44.628547 IP6 fe80::230:5ff:fe96:90dd.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 solicit
01:42:45.699812 IP6 fe80::230:5ff:fe96:90dd.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 solicit
01:42:47.902235 IP6 fe80::230:5ff:fe96:90dd.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 solicit
01:42:52.096659 IP6 fe80::230:5ff:fe96:90dd.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 solicit
01:43:00.885703 IP6 fe80::230:5ff:fe96:90dd.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 solicit

dhcpd.log: (WLAN client, okay)
Dec 28 01:42:58 prokyon dhcpd[27274]: Renew message from fe80::21f:e1ff:fe1d:61
port 546, transaction ID 0xEF0D5700
Dec 28 01:42:58 prokyon dhcpd[27274]: Reply NA: address
fd10:2842:f0d1:202:5d32:abf3:7de2:5f1 to client with duid
00:04:9d:83:51:09:62:93:3d:bb:05:9f:95:24:50:3f:5c:f2 iaid = -518193055 valid
for 1200 seconds

tcpdump: (WLAN client, okay)
01:47:15.872782 IP6 fe80::21f:e1ff:fe1d:61.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 confirm
01:47:15.872902 IP6 fe80::21f:e1ff:fe1d:61.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 confirm
01:47:15.899030 IP6 fe80::a5:4ff:fe3d:9610.dhcpv6-server >
fe80::21f:e1ff:fe1d:61.dhcpv6-client: dhcp6 reply




-- System Information:
Debian Release: 9.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages isc-dhcp-server depends on:
ii  debconf [debconf-2.0]  1.5.61
ii  debianutils            4.8.1.1
ii  libc6                  2.24-11+deb9u1
ii  libdns-export162       1:9.10.3.dfsg.P4-12.3+deb9u3
ii  libirs-export141       1:9.10.3.dfsg.P4-12.3+deb9u3
ii  libisc-export160       1:9.10.3.dfsg.P4-12.3+deb9u3
ii  lsb-base               9.20161125

Versions of packages isc-dhcp-server recommends:
ii  isc-dhcp-common  4.3.5-3
ii  policycoreutils  2.6-3

Versions of packages isc-dhcp-server suggests:
pn  isc-dhcp-server-ldap  <none>
ii  policykit-1           0.105-18

-- Configuration Files:
/etc/dhcp/dhcpd.conf changed [not included]
/etc/dhcp/dhcpd6.conf changed [not included]

-- debconf information excluded

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