dhcpcd-discuss

Hello!

I'm running dhcpcd for plain DHCPv6 address assignment (along with
DHCPv4 and SLAAC).  Everything works except the DHCPv6 addresses are
being created with /128 prefixes where I want /64.  The router
advertisements look correct and if I enable "AdvAutonomous" on the same
subnet on the same link I get SLAAC addresses (from dhcpcd) with the
correct prefix.

I don't know where the prefix should come from and why it's not working.
 I found a section of code for "RFC 5942 Section 5" but I patched it and
it doesn't help so I don't think that's the problem.


Here are some logs as the address gets assigned:

Sep 27 08:59:35 [5605]: eth1: broadcasting SOLICIT6 (xid 0x32576f), next
in 0.9 seconds
Sep 27 08:59:35 [5605]: eth1: ADV
fd70:a6a5:a58b:0:ffff:ffff:ffff:fff8/128 from fe80::a00:27ff:fe5d:6607
Sep 27 08:59:35 [5605]: eth1: broadcasting REQUEST6 (xid 0x8f2ce2), next
in 1.0 seconds
Sep 27 08:59:35 [5605]: eth1: REPLY6 received from fe80::a00:27ff:fe5d:6607
Sep 27 08:59:35 [5605]: eth1: adding address
fd70:a6a5:a58b:0:ffff:ffff:ffff:fff8/128
Sep 27 08:59:35 [5605]: eth1: pltime 1125 seconds, vltime 1800 seconds
Sep 27 08:59:35 [5605]: eth1: renew in 562, rebind in 900, expire in
1800 seconds
Sep 27 08:59:35 [5605]: eth1: writing lease `/var/db/dhcpcd/eth1.lease6'
Sep 27 08:59:35 [5605]: eth1: waiting for DHCPv6 DAD to complete


Here is the configuration:

debug
script /usr/sbin/dhcpcd_hook.py
logfile /var/log/dhcp_client.log

# Request nameservers from the server
option domain_name_servers

# From the example config:
# Use the hardware address of the interface for the Client ID.
clientid
# Rapid commit support.
# Safe to enable by default because it requires the equivalent option set
# on the server to actually work.
option rapid_commit
# Respect the network MTU. This is applied to DHCP routes.
option interface_mtu
# A ServerID is required by RFC2131.
require dhcp_server_identifier


I'm running Linux 4.1.35.  net.ipv6.conf.eth1.accept_ra is 0.


The arch-rival dhclient works correctly on a different machine with the
same DHCPv6 server.


                  Graham

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*Graham Breed*
Systems Developer, ApplianSys

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