dhcp6r(8)dhcp6r(8)NAMEdhcp6r - DHCPv6 relay agent
SYNOPSISdhcp6r [ -d ] [ client-options ] [ server-options ]
DESCRIPTIONdhcp6r acts as DHCPv6 relay agent forwarding DHCPv6 messages from
clients to servers and vice versa. DHCPv6 messages from clients are
received at UDP port 547, they are forwarded to one or more DHCPv6
servers by multicast and/or unicast. DHCPv6 messages from servers to
clients are also received at UDP port 547 and forwarded by unicast
only.
DHCPv6 messages received by multicast at a certain IPv6 interface are
never forwarded by multicast to the same interface.
If no options are present, the relay agent receives messages by unicast
and multicast at all IPv6 interfaces, and all messages are forwarded to
all IPv6 interfaces by multicast with the exception mentioned in the
previous paragraph.
If one or more client-options are present, then messages are only
received as specified by the client options. If one or more server-
options are present, then messages are only forwarded as specified by
the server options.
CLIENT-OPTIONS
If no client-options are present, the relay receives messages by multi‐
cast and unicast at all IPv6 interfaces.
If one or more client options are present, then messages are only
received as specified by the client-options.
In any case, the relay receives client messages by unicast.
-cu This option can be used to configure the client such that it
receives messages from clients or other relay agents by unicast
only. It does not have any effect if a -cm option is present.
-cm INTERFACE
Accept client messages multicasted at IPv6 interface INTERFACE.
The others are receiving only unicast messages. For specifying a
set of interfaces, an instance of this option is required for
each interface.
SERVER-OPTIONS
If no server-options are present, the relay forwards messages received
from clients by multicast and unicast to all IPv6 interfaces, except
the one, which the packet was received on.
If one or more server-options are present, then messages are forwarded
as specified by the server-options.
-sm INTERFACE
Forward all received client messages by multicast at IPv6 inter‐
face INTERFACE. For specifying a set of interfaces, an instance
of this option is required for each interface.
-su ADDRESS
Forward all received client messages by unicast to the IPv6
address ADDRESS. For specifying a set of addresses, an instance
of this option is required for each address.
-sf INTERFACE+ADDRESS
Forward all received client messages by unicast to the IPv6
address ADDRESS through the IPv6 interface INTERFACE. For spec‐
ifying a set of combinations of interfaces and addresses, an
instance of this option is required for each combination.
The -sm, -su, and -sf options can be combined in arbitrary ways.
OTHER OPTIONS-d If this option is not present, dhcp6r will dump logging informa‐
tion into the file /var/log/dhcp6r.log. If the option is
present, logging information will be sent to stderr instead.
EXAMPLES
The following examples are shown as given to the shell:
dhcp6r
Receive messages from clients at all IPv6 interfaces by multi‐
cast and by unicast, and forward them to all (other) IPv6 inter‐
faces by multicast.
dhcp6r-cu
Receive messages from clients by unicast only, and forward them
to all (other) IPv6 interfaces by multicast.
dhcp6r-cm eth0 -cm eth2
Receive messages from clients at interfaces eth0 and eth2 by
multicast and by unicast, and forward them to all IPv6 inter‐
faces by multicast (except the one at which the message was
received by multicast).
dhcp6r-cm eth0 -cm eth2 -sm eth1
Receive messages from clients at interfaces eth0 and eth2 by
multicast and by unicast, and forward them to interfaces eth1 by
multicast.
dhcp6r-su fec0::204:ce33:763f:b34 -su fec0::504:ff33:73f:c557
Receive messages from clients at all IPv6 interfaces by multi‐
cast and by unicast, and forward a copy of them to each of the
specified addresses.
dhcp6r-sm eth1 -su fec0::204:ce33:763f:b34
Receive messages from clients at all IPv6 interfaces by multi‐
cast and by unicast, and forward them to interface eth1 by mul‐
ticast and to the specified unicast address.
dhcp6r-sm eth1 -sf eth0+fec0::504:ff33:73f:c557
Receive messages from clients at all IPv6 interfaces by multi‐
cast and by unicast, and forward them to interface eth1 by mul‐
ticast and to the specified unicast address. For the unicast
address it is enforced that the message will be sent through
interface eth0.
NOTES
For proper operation of dhcp6r, the host must have at least one
global/site scope address assigned to each interface.
FILES
/var/log/dhcv6r.log /var/run/dhcp6r.pid
BUGS
Report bugs via http://hosted.fedoraproject.org/projects/dhcpv6/
AUTHORS
See http://hosted.fedoraproject.org/projects/dhcpv6/wiki/Authors
dhcp6r(8)
