Fwd: VLAN configuration not working

Sun Dec 14 13:44:43 UTC 2014

If I'm on VLAN20 I actually get an IP-address. But it's an address from the
range 172.16.100.0/24.
I can't PING the DHCP server in same range (172.16.100.2).
If I manually set IP-address in 172.16.254.0/24 range (172.16.254.10) I can
PING 172.16.254.2

So it seems ISC-DHCP server is ignoring my other subnet defined and is only
handing out addresses from the 172.16.100.0/24 scope.

Here's the clients info (Windows 7 client):

IPv4 Address. . . . . . . . . . . : 172.16.100.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 14. december 2014 14:38:50
Lease Expires . . . . . . . . . . : 15. december 2014 07:18:50
Default Gateway . . . . . . . . . : 172.16.100.1
DHCP Server . . . . . . . . . . . : 172.16.254.2
DHCPv6 IAID . . . . . . . . . . . : 301993001

As you can see DHCP server is correct 172.16.254.2, but IP-address served
is from wrong subnet....

Is it a bug ? Or am I missing something in the configuration file ?

---------- Forwarded message ----------
From: Jens Jönsson <jens.joensson at gmail.com>
Date: 2014-12-14 13:57 GMT+01:00
Subject: VLAN configuration not working
To: dhcp-users at lists.isc.org

Hi!

I have installed an configured ISC DHCP server.

I want to provide IP-addresses on 2 VLANs.

I have the following network configuration:

eth0      Link encap:Ethernet  HWaddr 00:00:00:00:4a:1e
          inet addr:192.168.15.119  Bcast:192.168.15.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:438 errors:0 dropped:0 overruns:0 frame:0
          TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:45874 (44.7 KiB)  TX bytes:8606 (8.4 KiB)

eth1      Link encap:Ethernet  HWaddr 00:00:00:0:4a:28
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:594 errors:0 dropped:6 overruns:0 frame:0
          TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:61761 (60.3 KiB)  TX bytes:2993 (2.9 KiB)

eth1.20   Link encap:Ethernet  HWaddr 00:00:00:00:4a:28
          inet addr:172.16.254.2  Bcast:172.16.254.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:207 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:19682 (19.2 KiB)  TX bytes:1291 (1.2 KiB)

eth1.200  Link encap:Ethernet  HWaddr 00:00:00:00:4a:28
          inet addr:172.16.100.2  Bcast:172.16.100.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:956 (956.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:788 (788.0 B)  TX bytes:788 (788.0 B)

I have installed and configured ISC DHCP server:
'
/etc/default/isc-dhcp-server
INTERFACES="eth1.20 eth1.200"

I have checked that it's running on both VLANs:

root at dhcp-server:~# ps ax | grep dhcpd
2605 ?        Ss     0:00 /usr/sbin/dhcpd -q -cf /etc/dhcp/dhcpd.conf -pf
/var/run/dhcpd.pid eth1.20 eth1.200
2763 pts/0    S+     0:00 grep dhcpd

If I connect a PC to VLAN200 I get an IP-address from the 172.16.100.0/24
range. If I move same PC to VLAN20 I get an error:

Unable to contact your DHCP server. Request has timed out.

If I manually configure PC with an IP-address on subnet 172.16.254.0/24
network and ping DHCP server I get a reply without problems. So PC is on
VLAN20.
Same of course apply for VLAN200, which make me conclude it's not a VLAN
network problem.

Here's my dhcpd.conf file:

shared-network officenet {
  subnet 172.16.254.0 netmask 255.255.255.0 {
    pool {
          option routers 172.16.254.1;
          option subnet-mask 255.255.255.0;
          option nis-domain "office.tld";
          option domain-name "vlan20.office.tld";
          option domain-name-servers 8.8.8.8, 8.8.4.4;
          option ntp-servers 0.pool.ntp.org, 1.pool.ntp.org;
          range 172.16.254.10 172.16.254.250;
    }
  }
  subnet 172.16.100.0 netmask 255.255.255.0 {
    pool {
          option routers 172.16.100.1;
          option subnet-mask 255.255.255.0;
          option nis-domain "office.tld";
          option domain-name "vlan200.office.tld";
          option domain-name-servers 8.8.8.8, 8.8.4.4;
          range 172.16.100.10 172.16.100.250;
    }
  }
}

Any help would be appreciated :-)

Thanks in advance...
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