Hi all,
I try to get a IPv6 address via DHCP from a "Windows 2012 R2 Server with DHCPv6
Server".
With actual busybox 1.31.1 and enabled IPv6 and udhcpc6 feature I try to make
contact to the server.
My deivce is an embedded Linux 2.6
What is working perfectly well is busybox ping6 and I get an IPv6 address when
connecting my PC(Win 10) to the server.
I watched the network with Wireshark and found out, that the ping6 and the
dhcp-solicit from the PC are transmitted as ipv6-multicast.
But the udhcpc6 solicit message is sent as IPv4 broadcast (with
FF:FF:FF:FF:FF:FF as destination in the EthernetII frame) which is not correct
I think.
I have made some changes in the sources that way:
I defined the field in common.h/.c for the IPv6 multicast to a DHCPv6 (general
address is FF02::1:2)
const uint8_t MAC_DHCPBCAST_ADDR[6] ALIGN2= {
0x33, 0x33, 0x00, 0x01, 0x00, 0x02
};
and used it in d6_dhcp.c in the call of:
static int d6_mcast_from_client_data_ifindex(struct d6_packet *packet, uint8_t
*end)
{
/* FF02::1:2 is "All_DHCP_Relay_Agents_and_Servers" address */
static const uint8_t FF02__1_2[16] = {
0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02,
};
return d6_send_raw_packet( packet, (end - (uint8_t*) packet),
/*src*/ &client6_data.ll_ip6,
CLIENT_PORT6,
/*dst*/ (struct
in6_addr*)FF02__1_2, SERVER_PORT6, MAC_DHCPBCAST_ADDR,
client_data.ifindex
);
}
That works better now and I can see nearly the same contents in Wireshark as in
the PC-dhcpv6 request. Ther Server still does not answer but that may have
other reasons...
I'm not sure if there are other parts where it would make sense to change the
header...Please have a look!
Best regards!
Uwe Glaeser
dormakaba EAD GmbH
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