Can't hand out IPv6 via dhcpd-v6: No Route to Host

Forman, Jeffrey lists at jeffreyforman.net
Sat Apr 30 11:08:04 UTC 2016


Hi dhcp-users,

Long time listener, first time caller. The short description is, I am
trying to hand out IPv6 addresses via isc-dhcp-server v4.3.3-p1 and am
getting the following error message on the server:

send_packet6: No route to host

I'm not sure why though, because I can ping the requesting fe80 IP just
fine.

My layout:
isc-dhcp-server v4.3.3-p1 running on OpenBSD 5.9.

Config:
subnet6 2601:18d:4200:38f0::/64 {
        range6 2601:18d:4200:38f0::2 2601:18d:4200:38f0::50;
}

Full error message on command line from server:
Apr 30 06:55:19 foogate1 dhcpd: Solicit message from
fe80::5054:ff:fe76:c42d port 546, transaction ID 0x62A2C300
Apr 30 06:55:19 foogate1 dhcpd: Advertise NA: address
2601:18d:4200:38f0::50 to client with duid
00:01:00:01:1e:b4:27:91:52:54:00:76:c4:2d iaid = 7783469 valid for 2592000
seconds
Apr 30 06:55:19 foogate1 dhcpd: Sending Advertise to
fe80::5054:ff:fe76:c42d port 546
Apr 30 06:55:19 foogate1 dhcpd: send_packet6: No route to host
Apr 30 06:55:19 foogate1 dhcpd: dhcpv6: send_packet6() sent -1 of 127 bytes

Netstat -rn output on server (which to me tells me that I can see the host
on my network, hanging off of em1):
# netstat -rn | grep fe80::5054:ff:fe76:c42d
fe80::5054:ff:fe76:c42d%em1        52:54:00:76:c4:2d              UHLc
  0       15     -     4 em1

Ping output showing I can ping the host (from the dhcp server):
# ping6 fe80::5054:ff:fe76:c42d%em1
PING6 fe80::5054:ff:fe76:c42d%em1 (fe80::5054:ff:fe76:c42d%em1): 24 data
bytes
32 bytes from fe80::5054:ff:fe76:c42d%em1, icmp_seq=0 hlim=64 time=0.592 ms

What am I missing here? is there something misconfigured on the server to
tell it that that node is off of em1?

Any help greatly appreciated.

-Jeff
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