Fwd: VLAN configuration not working

Sun Dec 14 13:48:15 UTC 2014

No, it is not a bug.  You have misconfigured the server.  Remove the
shared-network block like the other people who replied have said.

On Sun, Dec 14, 2014 at 02:44:43PM +0100, Jens Jönsson wrote:
> 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...