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Today's Topics:
1. kea-dhcp6 ignoring DHCPv6 messages received on a tuntap
interface (Templin, Fred L)
2. Re: [Kea-users] kea-dhcp6 ignoring DHCPv6 messages received
on a tuntap interface (Templin, Fred L)
3. Re: [Kea-users] kea-dhcp6 ignoring DHCPv6 messages received
on a tuntap interface (Francis Dupont)
4. Re: [Kea-users] kea-dhcp6 ignoring DHCPv6 messages received
on a tuntap interface (Templin, Fred L)
----------------------------------------------------------------------
Message: 1
Date: Thu, 21 Apr 2016 22:19:10 +0000
From: "Templin, Fred L" <[email protected]>
To: "[email protected]" <[email protected]>,
"[email protected]" <[email protected]>
Cc: "Benson, Michael W" <[email protected]>
Subject: [kea-dev] kea-dhcp6 ignoring DHCPv6 messages received on a
tuntap interface
Message-ID:
<2134f8430051b64f815c691a62d9831835907...@xch-blv-105.nw.nos.boeing.com>
Content-Type: text/plain; charset="us-ascii"
Hello,
We are using kea-dhcp6 version 1.0.0 over a tuntap interface in tun mode. We
are sending DHCPv6 Solicit messages from a client to the kea server that is
supposed to be listening on tun0 (see attached kea.conf). When we run
"tcpdump -lnnXi tun0" on the kea server, we see what appear to be good
DHCPv6 Solicits wrapped in relay-fwd wrappers. The client is sending the
Solicits once per second, but the kea server never gives any indication that
it has received any of the messages even when run in debug mode.
Here is what the relay-fwd wrapped DHCPv6 Solicit message looks like taken
from tcpdump on the kea server's tun0 interface:
14:59:37.334546 IP6 fe80::ffff:ffff:ffff:ffff.546 > ff02::1:2.547: dhcp6
relay-fwd
0x0000: 6000 0000 008e 11ff fe80 0000 0000 0000 `...............
0x0010: ffff ffff ffff ffff ff02 0000 0000 0000 ................
0x0020: 0000 0000 0001 0002 0222 0223 008e c44e .........".#...N
0x0030: 0c00 0000 0000 0000 0000 0000 0000 0000 ................
0x0040: 0000 fe80 0000 0000 0000 ffff ffff ffff ................
0x0050: ffff 0012 0004 0000 b0e2 0042 0020 0011 ...........B....
0x0060: 001c 0000 b0e2 0001 0014 00ff aa04 0000 ................
0x0070: 0000 0000 0000 0000 ffff 0000 0000 0009 ................
0x0080: 0034 0185 2f37 0001 000a 0002 0000 b0e2 .4../7..........
0x0090: 0000 0000 0006 0004 0017 0018 0008 0002 ................
0x00a0: 0000 0019 000c 0000 b0e2 0000 0000 0000 ................
0x00b0: 0000 000e 0000 ......
and, here is the result of "ifconfig tun0" on the kea server:
tun0 Link encap:UNSPEC HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.8.0.1 P-t-P:10.8.0.1 Mask:255.255.255.0
inet6 addr: fe80::2/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:746 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:135370 (135.3 KB) TX bytes:912 (912.0 B)
Note that we have successfully used kea-dhcp6 over tuntap interfaces in
tun mode in other application contexts. Could it be that there is some kind
of tuntap configuration difference that is causing kea to ignore our messages?
Any ideas on how to debug this?
Thanks - Fred
[email protected]
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------------------------------
Message: 2
Date: Thu, 21 Apr 2016 22:20:49 +0000
From: "Templin, Fred L" <[email protected]>
To: "[email protected]" <[email protected]>,
"[email protected]" <[email protected]>
Cc: "Benson, Michael W" <[email protected]>
Subject: Re: [kea-dev] [Kea-users] kea-dhcp6 ignoring DHCPv6 messages
received on a tuntap interface
Message-ID:
<2134f8430051b64f815c691a62d9831835907...@xch-blv-105.nw.nos.boeing.com>
Content-Type: text/plain; charset="us-ascii"
Apologies; I included the wrong kea.conf file. Please use the one attached to
this
message instead.
Thanks - Fred
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Templin, Fred L
> Sent: Thursday, April 21, 2016 3:19 PM
> To: [email protected]; [email protected]
> Cc: Benson, Michael W <[email protected]>
> Subject: [Kea-users] kea-dhcp6 ignoring DHCPv6 messages received on a tuntap
> interface
>
> Hello,
>
> We are using kea-dhcp6 version 1.0.0 over a tuntap interface in tun mode. We
> are sending DHCPv6 Solicit messages from a client to the kea server that is
> supposed to be listening on tun0 (see attached kea.conf). When we run
> "tcpdump -lnnXi tun0" on the kea server, we see what appear to be good
> DHCPv6 Solicits wrapped in relay-fwd wrappers. The client is sending the
> Solicits once per second, but the kea server never gives any indication that
> it has received any of the messages even when run in debug mode.
>
> Here is what the relay-fwd wrapped DHCPv6 Solicit message looks like taken
> from tcpdump on the kea server's tun0 interface:
>
> 14:59:37.334546 IP6 fe80::ffff:ffff:ffff:ffff.546 > ff02::1:2.547: dhcp6
> relay-fwd
> 0x0000: 6000 0000 008e 11ff fe80 0000 0000 0000 `...............
> 0x0010: ffff ffff ffff ffff ff02 0000 0000 0000 ................
> 0x0020: 0000 0000 0001 0002 0222 0223 008e c44e .........".#...N
> 0x0030: 0c00 0000 0000 0000 0000 0000 0000 0000 ................
> 0x0040: 0000 fe80 0000 0000 0000 ffff ffff ffff ................
> 0x0050: ffff 0012 0004 0000 b0e2 0042 0020 0011 ...........B....
> 0x0060: 001c 0000 b0e2 0001 0014 00ff aa04 0000 ................
> 0x0070: 0000 0000 0000 0000 ffff 0000 0000 0009 ................
> 0x0080: 0034 0185 2f37 0001 000a 0002 0000 b0e2 .4../7..........
> 0x0090: 0000 0000 0006 0004 0017 0018 0008 0002 ................
> 0x00a0: 0000 0019 000c 0000 b0e2 0000 0000 0000 ................
> 0x00b0: 0000 000e 0000 ......
>
> and, here is the result of "ifconfig tun0" on the kea server:
>
> tun0 Link encap:UNSPEC HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> inet addr:10.8.0.1 P-t-P:10.8.0.1 Mask:255.255.255.0
> inet6 addr: fe80::2/64 Scope:Link
> UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
> RX packets:746 errors:0 dropped:0 overruns:0 frame:0
> TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> RX bytes:135370 (135.3 KB) TX bytes:912 (912.0 B)
>
> Note that we have successfully used kea-dhcp6 over tuntap interfaces in
> tun mode in other application contexts. Could it be that there is some kind
> of tuntap configuration difference that is causing kea to ignore our messages?
>
> Any ideas on how to debug this?
>
> Thanks - Fred
> [email protected]
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------------------------------
Message: 3
Date: Thu, 21 Apr 2016 22:34:12 +0000
From: Francis Dupont <[email protected]>
To: "Templin, Fred L" <[email protected]>
Cc: "[email protected]" <[email protected]>,
"[email protected]" <[email protected]>, "Benson, Michael
W"
<[email protected]>
Subject: Re: [kea-dev] [Kea-users] kea-dhcp6 ignoring DHCPv6 messages
received on a tuntap interface
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
As far as I know Kea used LPF for IPv4 (so it won't work with tun interfaces)
but IPv6 UDP fro IPv6 so it should work. IMHO you should add some fprintf's
in PktFilterInet6::receive to be sure packets are really received
(or if you don't want to recompile strace the server process).
And of course if you forgot flush the ip6table's...
Regards
Francis Dupont <[email protected]>
------------------------------
Message: 4
Date: Thu, 21 Apr 2016 22:46:16 +0000
From: "Templin, Fred L" <[email protected]>
To: Francis Dupont <[email protected]>
Cc: "[email protected]" <[email protected]>,
"[email protected]" <[email protected]>, "Benson, Michael
W"
<[email protected]>
Subject: Re: [kea-dev] [Kea-users] kea-dhcp6 ignoring DHCPv6 messages
received on a tuntap interface
Message-ID:
<2134f8430051b64f815c691a62d9831835907...@xch-blv-105.nw.nos.boeing.com>
Content-Type: text/plain; charset="us-ascii"
Hi Francis,
Are there instructions for strace'ing the server process? Even so, would that
tell us anything that would help us find a solution? It is perplexing that we
have gotten this working over tuntap interfaces in other application contexts
but can't seem to get it working in this one.
Also, see attached for the packets in pcap form suitable for wireshark. The
packets appear to be formed properly.
Thanks - Fred
> -----Original Message-----
> From: Francis Dupont [mailto:[email protected]]
> Sent: Thursday, April 21, 2016 3:34 PM
> To: Templin, Fred L <[email protected]>
> Cc: [email protected]; [email protected]; Benson, Michael W
> <[email protected]>
> Subject: Re: [kea-dev] [Kea-users] kea-dhcp6 ignoring DHCPv6 messages
> received on a tuntap interface
>
> As far as I know Kea used LPF for IPv4 (so it won't work with tun interfaces)
> but IPv6 UDP fro IPv6 so it should work. IMHO you should add some fprintf's
> in PktFilterInet6::receive to be sure packets are really received
> (or if you don't want to recompile strace the server process).
> And of course if you forgot flush the ip6table's...
>
> Regards
>
> Francis Dupont <[email protected]>
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